| SBL and other consumer lines of credit | — | — | — | — | — | $56B | $58.7B | $63.4B |
| FDIC-insured bank deposits | $48.2B | $49B | $48.5B | $48.7B | $48.8B | $49.1B | $50B | $52.2B |
| Money market and savings accounts | $31B | $32.3B | $32.4B | $33.2B | $33.3B | $33.9B | $35.7B | $37.5B |
| Aggregate Notional Principal Outstanding | $24B | $25.2B | $23.3B | $25.8B | $24.6B | $24.2B | $23.4B | $23.7B |
| Derivative Notional Amount | $24B | $25.2B | $23.3B | $25.8B | $24.6B | $24.2B | $23.4B | $23.7B |
| Notional | $24B | $25.2B | $23.3B | $25.8B | $24.6B | $24.2B | $23.4B | $23.7B |
| Deposits, At Or Above FDIC Insurance Limit | $6.2B | $7B | $7.4B | $7.7B | $8.4B | $9.8B | $10.2B | $10.2B |
| Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, after Allowance for Credit Loss | — | $8.9B | $8.5B | $8.1B | $7.8B | $7.4B | $7.1B | $6.9B |
| Estimated Fair Value | $8.5B | $8.3B | $7.7B | $7.4B | $7.2B | $6.9B | $6.6B | $6.4B |
| Debt Securities, Available-for-Sale, Unrealized Loss Position | — | $7.8B | $7B | $6.7B | $6.2B | $6B | $5.6B | $5.6B |
| Commercial lines of credit | — | — | — | — | — | $5.4B | $5.5B | $5.4B |
| 12 months or more | — | $7.3B | $6.6B | $6.4B | $6.1B | $5.7B | $5.4B | $5.1B |
| Fair Value of Securities Received as Collateral that Can be Resold or Repledged | $3.4B | $3.8B | $3.8B | $3.8B | $4.1B | $4B | $4.4B | $4.3B |
| Restricted Cash and Investments | $3.6B | $3.4B | $3.5B | $3.4B | $3.8B | $3.4B | $3.7B | $3.7B |
| Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10 | — | — | $4.3B | $4.2B | $4.1B | — | $3.3B | $3.2B |
| Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 | — | — | $3.8B | $3.8B | $3.7B | — | $3.1B | $3B |
| Time Deposits | $2.6B | $2.6B | $2.4B | $1.8B | $1.8B | $1.9B | $2B | $2.3B |
| Total Collateral Pledged to Third Parties | $1.7B | $1.7B | $1.4B | $1.4B | $1.6B | $2.1B | $1.7B | $2B |
| Other receivables | $1.9B | $1.8B | $1.5B | $1.9B | $1.8B | $1.8B | $1.5B | $1.8B |
| Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 | — | — | $2B | $1.9B | $1.8B | — | $1.7B | $1.7B |
| Investments In Company-Owned Life Insurance | $1.3B | $1.4B | $1.4B | $1.4B | $1.5B | $1.6B | $1.6B | $1.6B |
| Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 | — | — | $1.8B | $1.8B | $1.7B | — | $1.6B | $1.6B |
| Share Repurchase Program, Remaining Authorized, Amount | $944M | $644M | $1.5B | $1.2B | $749M | $399M | $1.9B | $1.5B |
| Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five | — | — | $1.5B | $1.3B | $1.2B | — | $1.4B | $1.5B |
| Trading assets | $1.5B | $1.5B | $1.5B | $1.5B | $1.3B | $1.5B | $1.5B | $1.4B |
| Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five | — | — | $1.5B | $1.2B | $1.2B | — | $1.3B | $1.4B |
| Collateralized debt | $1.2B | $938M | $768M | $787M | $883M | $1.1B | $882M | $1.1B |
| Derivative Liability, Security Sold under Agreement to Repurchase, and Security Loaned, Subject to Master Netting Arrangement, Deduction of Financial Instrument Not Offset | — | $924M | — | $766M | $865M | $1.1B | $860M | $1.1B |
| Derivative Liability, Security Sold under Agreement to Repurchase, and Security Loaned, Subject to Master Netting Arrangement, after Offset | — | $938M | — | $787M | $883M | $1.1B | $882M | $1.1B |
| 2026 | $508M | — | $1.8B | $946M | $515M | — | $1.4B | $1.1B |
| Security Loaned, Subject to Master Netting Arrangement, after Offset | — | $536M | — | $582M | $655M | $786M | $514M | $781M |
| Common stock, shares authorized (in shares) | $650M | $650M | $650M | $650M | $650M | $650M | $650M | $650M |
| 2027 | $1.7B | $2.2B | $493M | $682M | $1.1B | $1.6B | $400M | $635M |
| Collateralized agreements | $570M | $749M | $530M | $551M | $941M | $698M | $740M | $608M |
| Derivative Asset, Security Purchased under Agreement to Resell, and Security Borrowed, Subject to Master Netting Arrangement, before Offset | $570M | $749M | $530M | $551M | $941M | $698M | $740M | $608M |
| Derivative Asset, Security Purchased under Agreement to Resell, and Security Borrowed, Subject to Master Netting Arrangement, after Offset | — | $749M | — | $551M | $941M | $698M | $740M | $608M |
| Contract with Customer, Asset, after Allowance for Credit Loss | $595M | $600M | $454M | $456M | $470M | $532M | $472M | $536M |
| Unfunded lending commitments | $672M | $640M | $615M | $588M | $595M | $716M | $648M | $523M |
| Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One | — | — | $663M | $694M | $607M | — | $649M | $485M |
| Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One | — | — | $660M | $691M | $601M | — | $647M | $485M |
| Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | — | $653M | $791M | $669M | $599M | $532M | $477M | $483M |
| Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss | — | $653M | $791M | $669M | $599M | $532M | $477M | $483M |
| Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | — | $653M | $788M | $668M | $599M | $532M | $477M | $481M |
| Less than 12 months | — | $515M | $368M | $315M | $114M | $241M | $185M | $479M |
| Time Deposit Liability, Uninsured | $160M | $161M | $162M | $154M | $161M | $171M | $162M | $420M |
| Time Deposit Maturities, Year Two | $268M | $322M | $51M | $77M | $120M | $192M | $119M | $408M |
| Other investments ($20 and $8 pledged as collateral) | $333M | $302M | $299M | $306M | $315M | $390M | $398M | $399M |
| Security Sold under Agreement to Repurchase, Subject to Master Netting Arrangement, after Offset | — | $402M | — | $205M | $228M | $325M | $368M | $361M |
| Securities borrowed, gross assets recognized | $259M | $336M | $263M | $336M | $731M | $396M | $429M | $336M |
| Security Borrowed, Subject to Master Netting Arrangement, after Offset | — | $336M | — | $336M | $731M | $396M | $429M | $336M |
| Derivative, gross, assets | $400M | $349M | $392M | $366M | $334M | $307M | $295M | $285M |
| Fair Value Measurement Disclosure | $436M | $347M | $400M | $354M | $341M | $313M | $303M | $281M |
| Derivatives, gross, liabilities | $436M | $347M | $400M | $354M | $341M | $313M | $303M | $281M |
| Over twelve months | $15M | $11M | $11M | $11M | $16M | $19M | $24M | $278M |
| Security Purchased under Agreement to Resell, Subject to Master Netting Arrangement, before Offset | $311M | $413M | $267M | $215M | $210M | $302M | $311M | $272M |
| Security Purchased under Agreement to Resell, Subject to Master Netting Arrangement, after Offset | — | $413M | — | $215M | $210M | $302M | $311M | $272M |
| Common stock, shares issued (in shares) | $249.9M | $250M | $250M | $250.1M | $250.1M | $250.1M | $250.1M | $250.1M |
| Standby letters of credit | — | — | — | — | — | $217M | $233M | $233M |
| Derivative Asset, Subject to Master Netting Arrangement, Gross Liability and Collateral, Obligation to Return Cash, Offset | — | $246M | $301M | $274M | $261M | $239M | $225M | $214M |
| Gross Assets/Liabilities | $354M | $224M | $330M | $248M | $210M | $190M | $181M | $198M |
| Derivative Liability, Including Not Subject to Master Netting Arrangement, after Offset and Deduction | $354M | $224M | $330M | $248M | $210M | $190M | $181M | $198M |
| Derivative Liability | $354M | $224M | $330M | $248M | $210M | $190M | $181M | $198M |
| Derivative Liability, Subject to Master Netting Arrangement, after Offset | — | $224M | $330M | $248M | $210M | $190M | $181M | $198M |
| Common Stock, Shares, Outstanding | $205.6M | $203.3M | $204.6M | $203.1M | $200M | $198.1M | $197M | $194.6M |
| Client-owned fractional shares | $124M | $133M | $139M | $141M | $155M | $171M | $183M | $188M |
| Derivative Asset, Subject to Master Netting Arrangement, Collateral, Obligation to Return Cash, Offset Against Derivative Asset | $282M | $160M | $262M | $202M | $167M | $147M | $134M | $153M |
| Shares reserved for awards to employees and outside directors (in shares) | — | — | — | — | — | — | — | $99M |
| Derivative netting, Liabilities | — | $123M | $70M | $106M | $131M | $123M | $122M | $83M |
| Performing nonaccrual loans | $56M | $89M | $72M | $128M | $127M | $109M | $122M | $75M |
| Derivative Asset, Subject to Master Netting Arrangement, after Offset | — | $103M | $91M | $92M | $73M | $68M | $70M | $71M |
| Derivative Asset, Including Not Subject to Master Netting Arrangement, after Offset and Deduction | $76M | $98M | $84M | $87M | $72M | $67M | $70M | $70M |
| Time deposit liability, uninsured, maturity, three months or less | $64M | $76M | $72M | $63M | $75M | $83M | $60M | $70M |
| Time Deposit Maturities, Year Three | $20M | $30M | $27M | $37M | $54M | $70M | $49M | $62M |
| Derivative Asset, Subject to Master Netting Arrangement, Liability Offset | — | $86M | $39M | $72M | $94M | $92M | $91M | $61M |
| Derivative Liability, Subject to Master Netting Arrangement, Asset Offset | — | $86M | $39M | $72M | $94M | $92M | $91M | $61M |
| Treasury stock, shares (in shares) | $44.3M | $46.7M | $45.4M | $46.9M | $50.1M | $51.9M | $53.1M | $55.4M |
| Time deposit liability, uninsured, maturity, over three months through six months | $45M | $44M | $41M | $43M | $48M | $40M | $44M | $51M |
| Time Deposit Maturities, Year Four | $15M | $18M | $17M | $19M | $24M | $35M | $39M | $50M |
| Noncontrolling interests in subsidiaries | -$7M | -$6M | $6M | $15M | $2M | $1M | $4M | $43M |
| Thereafter | $8M | — | $3M | $7M | $13M | — | $10M | $25M |
| Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Offset | $49M | $37M | $31M | $34M | $37M | $31M | $31M | $22M |
| Time deposit liability, uninsured, maturity, over 6 months through 12 months | $36M | $30M | $38M | $37M | $22M | $29M | $34M | $21M |
| Decrease in Unrecognized Tax Benefits is Reasonably Possible | $6M | $22M | $22M | $20M | $17M | $11M | $12M | $11M |
| Decrease in Unrecognized Tax Benefits is Reasonably Possible | $6M | $22M | $22M | $20M | $17M | $11M | $12M | $11M |
| Amount by which unaccrued maximum of estimated range exceeds minimum | — | $40M | — | — | — | $10M | $10M | $10M |
| Interest Rate Hedge Reclassification (Next 12 Months) | -$28M | -$14M | -$15M | -$12M | -$11M | -$8M | -$6M | -$6M |
| Gains expected to be reclassified | -$28M | -$14M | -$15M | -$12M | -$11M | -$8M | -$6M | -$6M |
| Gross Unrealized Gains | — | $7M | $3M | $6M | $7M | $10M | $11M | $5M |
| Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | — | $0 | $3M | $1M | $0 | $0 | $0 | $2M |
| Number of loan portfolio segments | — | 6.00 | — | — | — | 6.00 | 6.00 | 6.00 |
| Number of share-based compensation plans | 1.00 | — | 1.00 | 1.00 | 1.00 | — | 1.00 | 1.00 |
| Percent ownership of subsidiaries that are consolidated | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% |
| FDIC-insured bank deposits as a % of total bank deposits | 89.0% | 87.0% | 87.0% | 86.0% | 85.0% | 83.0% | 83.0% | 84.0% |
| Instruments Measured At Fair Value, Percentage Of Assets | 13.0% | 12.0% | 12.0% | 11.0% | 11.0% | 10.0% | 10.0% | 9.0% |
| Weighted-Average Interest Rate on Time Deposits | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 |
| Interest-bearing demand deposits | 5.0% | 4.6% | 4.1% | 4.0% | 4.1% | 3.9% | 3.4% | 3.4% |
| Components | — | — | 851 | 819 | 794 | — | 0 | 0 |
| Debt Securities, Available-for-Sale, Weighted Average Yield | — | — | $0 | $0 | $0 | — | $0 | $0 |
| Total bank deposits | 3.4% | 3.2% | 2.8% | 2.7% | 2.6% | 2.6% | 2.2% | 2.1% |
| Savings And Money Market Accounts, Weighted-Average Rate | 2.2% | 2.2% | 1.8% | 1.7% | 1.6% | 1.6% | 1.3% | 1.3% |
| Common stock, par value (in dollars per share) | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 |
| Instruments Measured At Fair Value, Level 3, Percentage Of Assets | 1.0% | 1.0% | 1.0% | 1.0% | 1.0% | 1.0% | 1.0% | 1.0% |
| Instruments Measured At Fair Value, Percentage Of Liabilities | 2.0% | 2.0% | 2.0% | 2.0% | 2.0% | 2.0% | 2.0% | 1.0% |
| Deferred Tax Liabilities, Gross | — | $324M | — | — | — | $302M | — | — |
| Unrealized loss associated with loan portfolios | — | $32M | — | — | — | $23M | — | — |
| Deferred Tax Assets, Gross | — | $980M | — | — | — | $982M | — | — |
| Lease liabilities | — | $123M | — | — | — | $135M | — | — |
| Deferred Tax Assets, Net of Valuation Allowance | — | $971M | — | — | — | $973M | — | — |
| Deferred Tax Assets, Operating Loss Carryforwards | — | $26M | — | — | — | $30M | — | — |
| U.S. federal, state and foreign net operating loss, credit carryforwards and other carryforwards | — | $8M | — | — | — | $5M | — | — |
| Deferred Tax Assets, Operating Loss Carryforwards, State and Local | — | $5M | — | — | — | $5M | — | — |
| Fixed assets | — | $0 | — | — | — | $3M | — | — |
| Compensation and benefits | — | $433M | — | — | — | $455M | — | — |
| Accrued expenses | — | $46M | — | — | — | $43M | — | — |
| Deferred Tax Assets, Valuation Allowance | — | $9M | — | — | — | $9M | — | — |
| Deferred Tax Liabilities, Other | — | $8M | — | — | — | $10M | — | — |
| Deferred Tax Liabilities, Property, Plant and Equipment | — | $44M | — | — | — | $0 | — | — |
| Derivative Asset, Security Purchased under Agreement to Resell, and Security Borrowed, Subject to Master Netting Arrangement, Liability Offset | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 |
| Derivative Asset, Security Purchased under Agreement to Resell, and Security Borrowed, Subject to Master Netting Arrangement, after Offset and Deduction | — | $10M | — | $10M | $17M | $24M | $14M | $0 |
| Potential reduction in net position of total derivative liabilities | — | $0 | $0 | $0 | $0 | $0 | $0 | $0 |
| Derivative Liability, Security Sold under Agreement to Repurchase, and Security Loaned, Subject to Master Netting Arrangement, after Offset and Deduction | — | $14M | — | $21M | $18M | $18M | $22M | $0 |
| 2028 | — | $39M | — | — | — | $38M | — | — |
| 2030 | — | $37M | — | — | — | $37M | — | — |
| 2031 | — | $37M | — | — | — | $35M | — | — |
| 2027 | — | $41M | — | — | — | $39M | — | — |
| 2029 | — | $38M | — | — | — | $37M | — | — |
| Finite Lived Intangible Assets Amortization Expense After Year Five | — | $186M | — | — | — | $153M | — | — |
| Tax receivable within other current assets | — | $28M | — | — | — | $79M | — | — |
| Minimum amount of shared national credit loan syndications | — | $100M | — | — | — | $100M | — | — |
| Minimum number of regulated institutions with which SNCs are shared (or more) | — | 3.00 | — | — | — | 3.00 | — | — |
| Number of general types of non-guaranteed tax credit funds | — | 2.00 | — | — | — | 2.00 | — | — |
| Number of party with power | — | 1.00 | — | — | — | 1.00 | — | — |
| Number of single investor members or limited partners in funds | — | 1.00 | — | — | — | 1.00 | — | — |
| Security Borrowed, Subject to Master Netting Arrangement, after Offset and Deduction | — | $10M | — | $10M | $17M | $24M | $14M | $0 |
| Security Loaned, Subject to Master Netting Arrangement, after Offset and Deduction | — | $14M | — | $21M | $18M | $18M | $22M | $0 |
| Security Purchased under Agreement to Resell, Subject to Master Netting Arrangement, after Offset and Deduction | — | $0 | — | $0 | $0 | $0 | $0 | $0 |
| Security Sold under Agreement to Repurchase, Subject to Master Netting Arrangement, after Offset and Deduction | — | $0 | — | $0 | $0 | $0 | $0 | $0 |
| Share Repurchase Program, Authorized, Amount | — | — | $2B | — | — | — | $2B | — |
| Undistributed Earnings of Foreign Subsidiaries | — | $578M | — | — | — | $669M | — | — |
| Unrecognized tax benefits | — | $48M | — | — | — | $47M | — | — |
| Penalties and interest accrued on unrecognized tax benefits | — | $14M | — | — | — | $9M | — | — |
| Amount that if recognized, would affect the effective tax rate or regulatory liability | — | $41M | — | — | — | $41M | — | — |
| Non-interest-bearing demand deposits | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% |
