| Aggregate Notional Principal Outstanding | $687.3B | $716.5B | $702B | $712.7B | $701.5B | $739.2B | $714B | $735.9B |
| Notional | $687.3B | $716.5B | $702B | $712.7B | $701.5B | $739.2B | $714B | $735.9B |
| Other Commitment | $285.8B | $290.4B | $295.1B | $297.3B | $308.5B | $313.9B | $326.2B | $335.6B |
| Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, after Allowance for Credit Loss | $54.9B | $62.7B | $65.5B | $66B | $69.8B | $70.4B | $69.9B | $73.2B |
| Estimated Fair Value | $51.2B | $60.3B | $62B | $63.3B | $67.1B | $68.3B | $68.1B | $71.1B |
| Carrying Value | — | $64.7B | $58.6B | $57.2B | $57.2B | $58.3B | $54.7B | $63.9B |
| After 10 Years | — | $45.4B | — | $43.1B | $45.7B | $45.7B | — | $45.5B |
| After 10 Years | — | $43.5B | — | $40.2B | $42.8B | $43.4B | — | $43.3B |
| After 10 Years | — | $33.3B | — | $34.6B | $36.6B | $35.9B | — | $40B |
| Debt Securities, Available-for-Sale, Unrealized Loss Position | $43.4B | $39.3B | $49.6B | $35.6B | $45.6B | $38.4B | $22.7B | $38.5B |
| After 10 Years | — | $31.2B | — | $32.1B | $34.2B | $33.9B | — | $38.1B |
| After 1 Year through 5 Years | — | $12.4B | — | $15.1B | $16B | $17.7B | — | $24.7B |
| 12 months or more | $28.9B | $26.9B | $25.1B | $24.8B | $31.6B | $30.9B | $22.1B | $21.3B |
| Over 5 years | $14.1B | $16.2B | — | $17.5B | $17.1B | $18.5B | — | $20.2B |
| Less than 12 months | $14.5B | $12.3B | $24.5B | $10.8B | $14B | $7.6B | $644M | $17.2B |
| 1 to 2 years | $13.6B | $12.3B | — | $9.8B | $11.7B | $11B | — | $16.6B |
| After 1 Year through 5 Years | — | $23.1B | — | $18.2B | $17.6B | $12.9B | — | $13.9B |
| After 1 Year through 5 Years | — | $22.7B | — | $17.8B | $17.4B | $12.7B | — | $13.7B |
| Less than 1 year | $29B | $25.2B | — | $16.9B | $14B | $14.8B | — | $13.1B |
| 1 Year or Less | — | $10.7B | — | $9.5B | $8.2B | $11B | — | $7.8B |
| 1 Year or Less | — | $10.7B | — | $9.4B | $8.1B | $10.9B | — | $7.8B |
| After 5 Years through 10 Years | — | $15.8B | — | $15.4B | $15.9B | $16.1B | — | $7.1B |
| 2 to 3 years | $4.6B | $4B | — | $7.7B | $7.2B | $8.7B | — | $6.9B |
| 3 to 4 years | $4.1B | $5.4B | — | $2.4B | $6.2B | $5B | — | $6.7B |
| Allowance for credit loss and off-balance sheet liability | $5.4B | $5.3B | $5.2B | $5.2B | $5.3B | $5.3B | $5.2B | $5.5B |
| After 5 Years through 10 Years | — | $4.6B | — | $3.7B | $3.7B | $3.7B | — | $4.8B |
| After 5 Years through 10 Years | — | $4.5B | — | $3.5B | $3.6B | $3.6B | — | $4.6B |
| Derivatives, gross, liabilities | $6.2B | $4.6B | $5.5B | $4.7B | $4.5B | $3.8B | $3.6B | $4B |
| 4 to 5 years | $6B | $5B | — | $6.4B | $4.3B | $4.4B | — | $3.2B |
| Derivative, gross, assets | $3.1B | $3.3B | $3B | $3.1B | $3.1B | $2.8B | $2.7B | $3.1B |
| Debt Securities, Held-to-Maturity, Accumulated Unrecognized Loss | $5.3B | $2.8B | $4.7B | $3.7B | $3.5B | $2.9B | $2.5B | $2.8B |
| Investments to quality for PAM | — | — | — | — | — | — | $3B | $2.7B |
| Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | $3.9B | $2.8B | $3.7B | $3.1B | $3B | $2.7B | $2.4B | $2.5B |
| Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss | $3.9B | $2.7B | $3.7B | $3.1B | $3B | $2.7B | $2.4B | $2.5B |
| OCI, Debt Securities, Available-For-Sale, Transfer To Held-To-Maturity, Adjustment From AOCI For Amortization Of Gain (Loss) | -$3.8B | -$3.6B | -$3.4B | -$3.2B | -$3B | -$2.8B | -$2.7B | -$2.5B |
| Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $3.8B | $2.7B | $3.5B | $3B | $3B | $2.6B | $2.4B | $2.5B |
| Derivative, Net Liability Position, Aggregate Fair Value | $4.8B | $3.1B | $3.9B | $3.2B | $2.7B | $2.4B | $2.3B | $2.4B |
| Cash and securities pledged to collateralize net derivative liabilities | $2.5B | $2.1B | $2.3B | $2.4B | $1.9B | $1.7B | $1.6B | $2.1B |
| Cash and securities held to collateralize net derivative assets | $2.5B | $2.4B | $2.4B | $2.1B | $1.6B | $1.7B | $1.6B | $2B |
| Gross Assets/Liabilities | $3.7B | $2.4B | $3.2B | $2.4B | $2.1B | $1.7B | $1.7B | $1.8B |
| Derivative Liability | $3.7B | $2.4B | $3.2B | $2.4B | $2.1B | $1.7B | $1.7B | $1.8B |
| Derivative Liability, Including Not Subject to Master Netting Arrangement, after Offset and Deduction | $3.6B | $2.3B | $3.1B | $2.3B | $2B | $1.7B | $1.7B | $1.8B |
| Unearned income, unamortized deferred fees and costs on originated loans, and premiums or discounts on purchased loans | $900M | $900M | $1B | $900M | $1B | $1B | $1.1B | $1.7B |
| Aggregate Fair Value of Additional Collateral Required | $3.5B | $2.2B | $2.8B | $2.1B | $1.7B | $1.5B | $1.5B | $1.6B |
| Additional Collateral Required - One Notch Downgrade | $3.5B | $2.2B | $2.8B | $2.1B | $1.7B | $1.5B | $1.5B | $1.6B |
| Derivative Asset, Subject to Master Netting Arrangement, Liability Offset | $1.3B | $1.4B | $1.3B | $1.5B | $1.6B | $1.3B | $1.2B | $1.4B |
| Derivative Asset Setoff Right Amount | $1.3B | $1.4B | $1.3B | $1.5B | $1.6B | $1.3B | $1.2B | $1.4B |
| Derivative Liability, Subject to Master Netting Arrangement, Asset Offset | $1.3B | $1.4B | $1.3B | $1.5B | $1.6B | $1.3B | $1.2B | $1.4B |
| Derivative Liability Setoff Right Amount 1 | $1.3B | $1.4B | $1.3B | $1.5B | $1.6B | $1.3B | $1.2B | $1.4B |
| Net unsettled investment purchases | $151M | $952M | $1.2B | $300M | $577M | $438M | — | $1.3B |
| 1 Year or Less | — | $953M | — | $670M | $1B | $534M | — | $1.3B |
| Fair Value of Securities Received as Collateral that Can be Resold or Repledged | $681M | $1.5B | $1.2B | $1.7B | $1.4B | $2B | $759M | $1.2B |
| Total Collateral Pledged to Third Parties | $681M | $1.5B | $1.2B | $1.7B | $1.4B | $2B | $759M | $1.2B |
| Derivative Asset, Including Not Subject to Master Netting Arrangement, after Offset and Deduction | $627M | $1.1B | $771M | $1.1B | $1.1B | $958M | $944M | $1.1B |
| Off-Balance-Sheet, Credit Loss, Liability | $717M | $725M | $719M | $674M | $759M | $775M | $818M | $832M |
| Collateral already posted, aggregate fair value | $1.3B | $900M | $1.1B | $1.1B | $1B | $900M | $800M | $800M |
| Common stock, shares authorized (in shares) | 800M | 800M | 800M | 800M | 800M | 800M | 800M | 800M |
| Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Offset | $1.2B | $836M | $1B | $897M | $859M | $752M | $743M | $747M |
| Nonperforming Loans and Leases Percentage | $500M | $600M | $600M | $600M | $600M | $600M | $600M | $700M |
| Interest-bearing deposits | — | — | $0 | $1.2B | $5.6B | $7.3B | $3.6B | $700M |
| Common stock, shares issued (in shares) | 543.2M | 543.2M | 543.3M | 543.3M | 543.4M | 543.4M | 543.5M | 557.2M |
| Derivative Asset, Subject to Master Netting Arrangement, Collateral, Obligation to Return Cash, Offset Against Derivative Asset | $1.1B | $761M | $897M | $504M | $360M | $485M | $494M | $505M |
| Gross Unrealized Gains | $202M | $458M | $243M | $372M | $417M | $541M | $621M | $456M |
| Unused credit available | $400M | $500M | $900M | $200M | $400M | $700M | $1B | $300M |
| Accrued interest available-for-sale debt securities | $252M | $247M | $328M | $259M | $325M | $282M | $348M | $266M |
| Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | $62M | $312M | $78M | $145M | $199M | $333M | $403M | $255M |
| Debt Securities, Held-to-Maturity, Derivative, Cumulative Loss | $285M | $280M | $275M | $271M | $265M | $255M | $229M | $225M |
| Accrued Interest, held-to-maturity | $268M | $234M | $242M | $204M | $235M | $207M | $219M | $212M |
| Treasury stock, shares (in shares) | 145.7M | 146.3M | 147.4M | 147.5M | 149.4M | 151M | 153.1M | 155.2M |
| Allowances for investment securities and other financial assets | $112M | $111M | $114M | $91M | $88M | $101M | $99M | $103M |
| Other borrowed funds, fair value (less than) | $100M | $100M | $100M | $100M | $100M | $100M | $100M | $100M |
| Other liabilities | $100M | $100M | $100M | $100M | $100M | $100M | $100M | $100M |
| Investment securities, allowance for credit loss | $93M | $93M | $91M | $68M | $68M | $67M | $66M | $66M |
| Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $58M | $39M | $147M | $26M | $50M | $19M | $5M | $62M |
| Available-for-sale securities, allowance for credit loss | $88M | $88M | $86M | $63M | $63M | $62M | $61M | $61M |
| Noncontrolling interests in subsidiaries | $39M | $40M | $44M | $46M | $48M | $48M | $51M | $49M |
| Securities Collateral Held /Pledged Under Master Netting Agreements | $33M | $2M | $45M | $47M | $72M | $79M | $76M | $41M |
| Securities Collateral Held /Pledged Under Master Netting Agreements | $64M | $40M | $57M | $44M | $38M | $30M | $29M | $34M |
| Debt securities, held-to-maturity, allowance for credit loss (less than) | $5M | $5M | $5M | $5M | $5M | $5M | $5M | $5M |
| Par value less than $.5 million at each date | $500K | $500K | $500K | $500K | $500K | $500K | $500K | $500K |
| Common stock, par value (in dollars per share) | $5.00 | $5.00 | $5.00 | $5.00 | $5.00 | $5.00 | $5.00 | $5.00 |
| Number of distinct operating units | 2.00 | 2.00 | 2.00 | 2.00 | 2.00 | 2.00 | 2.00 | 2.00 |
| Number of portfolio segments | 2.00 | 2.00 | 2.00 | 2.00 | 2.00 | 2.00 | 2.00 | 2.00 |
| Loans 90+ Days Past Due Percentage | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% |
| Weighted-average yield, GAAP basis, available for sale securities | — | 0 | — | 0 | 0 | 0 | — | 0 |
| Weighted-average yield, GAAP basis, held to maturity securities | — | 0 | — | 0 | 0 | 0 | — | 0 |
| Defined Benefit Plan Weighted Average Asset Allocation | — | — | 1 | — | — | — | 1 | — |
| Operating Lease Income - 2023 (Lessor) | — | — | $25M | — | — | — | $16M | — |
| Operating Lease Income - 2024 (Lessor) | — | — | $25M | — | — | — | $16M | — |
| Allocations for bad debt deductions of former thrift subsidiaries included in retained earnings | — | — | $100M | — | — | — | $100M | — |
| Carrying value of FHLB and FRB stock | — | — | $2.1B | — | — | — | $1.7B | — |
| Common stock, capital shares reserved for future issuance | — | — | 78M | — | — | — | 77M | — |
| Deferred Tax Liabilities, Gross | — | — | $2.9B | — | — | — | $2.7B | — |
| Net unrealized losses on securities and financial instruments | — | — | $2.1B | — | — | — | $1.1B | — |
| Deferred Tax Assets, Gross | — | — | $4.7B | — | — | — | $3.5B | — |
| Deferred Tax Assets, Net | — | — | $1.8B | — | — | — | $814M | — |
| Deferred Tax Assets, Net of Valuation Allowance | — | — | $4.7B | — | — | — | $3.5B | — |
| Lease obligations | — | — | $475M | — | — | — | $494M | — |
| Compensation and benefits | — | — | $312M | — | — | — | $312M | — |
| Allowance for unfunded lending related commitments | — | — | $177M | — | — | — | $201M | — |
| Accrued expenses | — | — | $188M | — | — | — | $65M | — |
| Deferred Tax Assets, Valuation Allowance | — | — | $23M | — | — | — | $24M | — |
| Fixed assets | — | — | $397M | — | — | — | $324M | — |
| Mortgage servicing rights | — | — | $434M | — | — | — | $424M | — |
| Deferred Tax Liabilities, Other | — | — | $472M | — | — | — | $455M | — |
| Right of use assets | — | — | $412M | — | — | — | $434M | — |
| Assumed health care cost trend rate Initial trend | — | — | 6.5% | — | — | — | 7.0% | — |
| Salary scale, pension benefit obligation | — | — | 4.3% | — | — | — | 4.3% | — |
| Expected long-term return on plan assets for next fiscal year | — | — | $0.1 | — | — | — | $0.1 | — |
| Assumed health care cost trend rate Ultimate trend | — | — | 4.5% | — | — | — | 4.5% | — |
| Liability related to investments in low income housing tax credits | — | — | $2.2B | — | — | — | $3B | — |
| Number of international offices | — | — | 4.00 | — | — | — | 4.00 | — |
| Percentage of bonds with highest yields excluded from calculation of yield curve for pension plan assumptions | — | — | 10.0% | — | — | — | 10.0% | — |
| Percentage of bonds with lowest yields excluded from calculation of yield curve for pension plan assumptions | — | — | 40.0% | — | — | — | 40.0% | — |
| Preferred Stock, Shares Authorized | — | — | 20M | — | — | — | 20M | — |
| Preferred Stock, Shares Issued | — | — | 58K | — | — | — | 58K | — |
| Preferred Stock, Shares Outstanding | — | — | 58K | — | — | — | 58K | — |
| Lessor, operating lease assets | — | — | $400M | — | — | — | $300M | — |
| Carrying value of residual assets with third-party residual value | — | — | $600M | — | — | — | $600M | — |
| 2028 | — | — | $1.3B | — | — | — | $1.7B | — |
| 2030 | — | — | $798M | — | — | — | $826M | — |
| Sales-Type and Direct Financing Leases, Payment to be Received | — | — | $6.2B | — | — | — | $6.6B | — |
| 2027 | — | — | $1.6B | — | — | — | $1.7B | — |
| 2029 | — | — | $1.3B | — | — | — | $1.2B | — |
| Amount available for dividend payments to parent company without prior regulatory approval | — | — | $7.4B | — | — | — | $8.4B | — |
| Time deposit accounts (including certificates of deposits) in denominations that met or exceeded the insured limit | — | — | $9.2B | — | — | — | $9.9B | — |
| Time Deposit Maturities, Year Four | — | — | $100M | — | — | — | $0 | — |
| 2027 | — | — | $33.8B | — | — | — | $33.6B | — |
| Time Deposit Maturities, Year Three | — | — | $100M | — | — | — | $100M | — |
| Time Deposit Maturities, Year Two | — | — | $200M | — | — | — | $200M | — |
| Time Deposits | — | — | $34.3B | — | — | — | $34B | — |
| Unrecognized tax benefits | — | — | $365M | — | — | — | $270M | — |
| Penalties and interest accrued on unrecognized tax benefits | — | — | $100M | — | — | — | $0 | — |
| Amount that if recognized, would affect the effective tax rate or regulatory liability | — | — | $314M | — | — | — | $243M | — |
| Unrecorded Unconditional Purchase Obligation | — | — | — | — | — | — | $318M | — |
| Sublease Income - Thereafter | — | — | $10M | — | — | — | $3M | — |