| Total unfunded lending commitments, contractual amount | $459.2B | $458.9B | $458.1B | $471.7B | $716.4B | $723.8B | $729.6B | $746.9B |
| Current | $306.6B | $307.8B | $314.7B | $312.3B | $424.7B | $427.6B | $437.3B | $433.2B |
| Aggregate Notional Principal Outstanding | $306.5B | $314.1B | $325.8B | $330.8B | $349.6B | $367.9B | $385.7B | $396.7B |
| Notional | $306.5B | $314.1B | $325.8B | $330.8B | $349.6B | $367.9B | $385.7B | $396.7B |
| Cost or Amortized Cost | $89.6B | $90.8B | $93B | $92.9B | $95.4B | $96.9B | $97.7B | $97.5B |
| Estimated Fair Value | $79.3B | $83.5B | $83B | $84.4B | $87.2B | $89.7B | $91.1B | $90.6B |
| After 10 Years | — | — | — | — | — | — | — | $76.7B |
| After 10 Years | $63.3B | $67.1B | — | $67.4B | $67.6B | $69.5B | — | $70.1B |
| Debt Securities, Available-for-Sale, Unrealized Loss Position | $69.1B | $66.3B | $70.5B | $65.6B | $67.1B | $58.8B | $54.4B | $62.4B |
| Long-Term Debt and Lease Obligation | $47.2B | $48.8B | $45B | $41.2B | $51.9B | $50.9B | $49.9B | $50.3B |
| 12 months or more | $61.4B | $59.7B | $55.3B | $54.7B | $54.5B | $55.1B | $52.2B | $47.6B |
| Intangible Assets Gross Including Goodwill | $15.6B | $15.6B | $15.6B | $15.6B | $47B | $47B | $46.7B | $46.7B |
| Investment securities | $40.6B | $40.1B | $39.4B | $38.6B | $38.5B | $37.4B | $39.7B | $39.4B |
| Goodwill, Gross | $15.1B | $15.1B | $15.1B | $15.1B | $28.3B | $28.9B | $28.5B | $28.5B |
| Indefinite- lived intangible impairment | $503M | $504M | $503M | $497M | $18.7B | $18.1B | $18.2B | $18.2B |
| Time Deposits, at or Above FDIC Insurance Limit | $14.5B | $14.7B | $15.2B | $12.6B | $16B | $16.9B | $17.4B | $17.7B |
| Less than 12 months | $7.7B | $6.6B | $15.2B | $10.9B | $12.6B | $3.7B | $2.2B | $14.8B |
| Deposit liability, uninsured | $9.3B | $9.7B | $10.1B | $8.8B | $10.9B | $13.7B | $12.9B | $13.4B |
| Gross Carrying Amount | — | — | $495M | — | $13.3B | $13.1B | $13.2B | $13.2B |
| After 1 Year through 5 Years | $6.1B | $6.9B | — | $6.9B | $9B | $9B | — | $9.8B |
| After 5 Years through 10 Years | $5.1B | $5.3B | — | $5.8B | $6.6B | $7.5B | — | $8.6B |
| Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | $10.5B | $7.6B | $10.1B | $8.8B | $8.5B | $7.6B | $7.1B | $7.2B |
| Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss | $10.5B | $7.6B | $10.1B | $8.8B | $8.5B | $7.6B | $7.1B | $7.2B |
| Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $10.4B | $7.6B | $9.9B | $8.7B | $8.4B | $7.6B | $7.1B | $7.1B |
| Total Loans | $3.1B | $3.1B | — | $3.1B | $7B | $6.8B | — | $6.6B |
| Tax credit investments | — | — | — | — | — | — | $6.2B | $6.2B |
| Trademarks | — | — | $8M | — | $5.4B | $5B | $5B | $5B |
| With an allowance | $3.1B | $3.5B | $3.8B | $3.4B | $4.7B | $4.9B | $5.4B | $5B |
| Discontinued Hedging Relationships, Assets | $1.8B | $1.4B | $3.4B | $3.5B | $3.8B | $3.8B | $3.7B | $3.6B |
| Accrued interest receivable | $2.2B | $2.2B | $2.2B | $2.2B | $3B | $3.1B | $3.1B | $3B |
| Derivative Asset, Including Not Subject to Master Netting Arrangement, after Offset and Deduction | $1.4B | $1.7B | $1.2B | $1.6B | $1.9B | $1.6B | $1.8B | $2.9B |
| Gross Assets/Liabilities | $2.4B | $2B | $1.7B | $1.8B | $1.7B | $1.5B | $1.6B | $2.6B |
| Derivative Liability, Including Not Subject to Master Netting Arrangement, after Offset and Deduction | $2.4B | $2B | $1.7B | $1.8B | $1.7B | $1.5B | $1.6B | $2.6B |
| Derivative Liability | $2.4B | $2B | $1.7B | $1.8B | $1.7B | $1.5B | $1.6B | $2.6B |
| Finite Lived Intangible Assets Amortization Expense After Year Five | — | — | — | — | $3.7B | $3.6B | — | $2.6B |
| Amortized cost basis of portfolios used in hedging relationships | — | — | — | — | — | — | $2.5B | $2.5B |
| Margin cash collateral provided to counterparties that was not offset against derivative assets or liabilities | — | — | — | — | — | — | $1.8B | $2.4B |
| Unfunded Affordable Housing Project Commitments | $2.2B | $2.1B | $2.1B | $1.9B | $2.1B | $2.1B | $2.5B | $2.4B |
| Unfunded Commitment - Proportional Amortization Investment | — | — | — | — | — | — | $2.5B | $2.4B |
| 1 Year or Less | $4.8B | $4.2B | — | $4.3B | $4B | $3.8B | — | $2.2B |
| Finite-Lived Intangible Assets, Accumulated Amortization | $232M | $251M | $270M | $281M | $551M | $1.1B | $1.6B | $2.1B |
| 2027 | — | — | — | — | $2B | $2B | — | $1.8B |
| Held-to-maturity securities, fair value | — | — | — | — | — | — | $0 | $1.7B |
| Fair Value | — | — | — | — | — | — | — | $1.7B |
| Debt Securities, Held-to-Maturity, Maturity, Allocated and Single Maturity Date, Fair Value | — | — | — | — | — | — | — | $1.7B |
| 2028 | — | — | — | — | $1.8B | $1.8B | — | $1.6B |
| Remainder of 2026 | — | — | — | — | $1.1B | $518M | — | $1.5B |
| Remainder of Fiscal Year 2024 | — | — | — | — | $1.1B | $518M | — | $1.5B |
| 2029 | — | — | — | — | $1.6B | $1.6B | — | $1.4B |
| After 10 Years | — | — | — | — | — | — | — | $1.3B |
| 2030 | — | — | — | — | $1.4B | $1.4B | — | $1.2B |
| 2031 | — | — | — | — | $1.2B | $1.2B | — | $1B |
| Common stock, shares authorized (in shares) | 1B | 1B | 1B | 1B | 1B | 1B | 1B | 1B |
| Unamortized premiums and discounts, deferred fees and costs | $1.3B | $1.3B | $1.2B | $1.3B | $946M | $963M | $980M | $1B |
| Common stock, shares issued (in shares) | 700.7M | 701.6M | 702.2M | 705.8M | 706.7M | 707.7M | 708.5M | 712.7M |
| Carrying Amount of Assets | $657M | $658M | $653M | $651M | $649M | $645M | $646M | $653M |
| Carrying value of assets pledged as collateral against repurchase agreements | $729M | $531M | $573M | $584M | $757M | $629M | $599M | $639M |
| Repurchase agreements, Gross amounts not offset in the balance sheet, Cash collateral pledged | — | — | — | — | — | — | $587M | $626M |
| Common Stock, Shares, Outstanding | 381.9M | 381.5M | 381.2M | 383M | 639.5M | 635.7M | 625.1M | 615.9M |
| Derivative Asset, Subject to Master Netting Arrangement, Gross Liability and Collateral, Obligation to Return Cash, Offset | $1B | $725M | $1.1B | $691M | $532M | $481M | $408M | $520M |
| After 5 Years through 10 Years | — | — | — | — | — | — | — | $395M |
| Margin cash collateral received from counterparties that was not offset against derivative assets | — | — | — | — | — | — | $144M | $364M |
| Servicing Asset at Amortized Cost, Accumulated Amortization | $290M | $301M | $309M | $319M | $326M | $336M | $343M | $352M |
| Derivative netting, Liabilities | $371M | $622M | $304M | $427M | $776M | $449M | $501M | $338M |
| Gross Unrealized Gains | $162M | $343M | $148M | $209M | $241M | $361M | $486M | $330M |
| Loss Contingency Estimate Of Possible Loss | $200M | $400M | — | $300M | $300M | $300M | — | $300M |
| Derivative Asset, Subject to Master Netting Arrangement, Liability Offset | $236M | $474M | $202M | $314M | $429M | $316M | $302M | $284M |
| Derivative Liability, Subject to Master Netting Arrangement, Asset Offset | $236M | $474M | $202M | $314M | $429M | $316M | $302M | $284M |
| Financial receivable, non-interest expense | — | — | — | $108M | — | — | — | $244M |
| Derivative Asset, Subject to Master Netting Arrangement, Collateral, Obligation to Return Cash, Offset Against Derivative Asset | $798M | $251M | $854M | $377M | $103M | $165M | $106M | $236M |
| Unused credit available | $193M | $263M | — | $225M | $197M | $158M | $225M | $173M |
| Loans Held For Sale Fair Value Disclosure | — | — | — | — | — | — | $755M | $169M |
| Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $52M | $15M | $194M | $84M | $87M | $8M | $6M | $107M |
| Off-balance sheet lending commitment, carrying value | $93M | $99M | $103M | $111M | $101M | $100M | $114M | $107M |
| Treasury stock, shares (in shares) | 318.8M | 320M | 321M | 322.9M | 67.2M | 72M | 83.4M | 96.8M |
| Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Offset | $135M | $148M | $102M | $113M | $347M | $133M | $199M | $54M |
| Preferred Stock, Shares Authorized | 50M | 50M | 50M | 50M | 50M | 50M | 50M | 50M |
| Debt Securities, Held-to-Maturity, Accumulated Unrecognized Loss | — | — | — | — | — | — | — | $11M |
| Hedged Asset Fair Value Hedge Cumulative Increase Decrease | $3M | $32M | $16M | $15M | $33M | $36M | $29M | $10M |
| Net valuation allowance | $3M | $3M | $1M | $3M | $5M | $6M | $5M | $5M |
| Preferred Stock, Shares Issued | 5M | 5M | 5M | 5M | 5M | 5M | 5M | 5M |
| Preferred Stock, Shares Outstanding | 5M | 5M | 5M | 5M | 5M | 5M | 5M | 5M |
| Available-for-sale securities, allowance for credit loss | $3M | $3M | $4M | $3M | $3M | $3M | $3M | $3M |
| Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | — | — | — | — | — | — | — | $1M |
| Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions | 2790.00 | 2500.00 | 2740.00 | 2480.00 | 2520.00 | 2330.00 | 2270.00 | 2390.00 |
| Percentage of total loans | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% |
| Current, percentage of total loans | 96.4% | 96.1% | 96.0% | 96.5% | 96.7% | 96.5% | 96.4% | 96.8% |
| 5-10 years | — | — | — | — | — | — | — | 0 |
| Debt Securities, Held-to-Maturity, Weighted Average Yield | — | — | — | — | — | — | — | 0 |
| After 10 years | — | — | — | — | — | — | — | 0 |
| Debt Securities, Available-for-Sale, Maturity, Rolling after 5 through 10 Years, Weighted Average Yield | — | — | — | — | — | — | — | 0 |
| Debt Securities, Available-for-Sale, Maturity, Rolling after One Through Five Years, Weighted Average Yield | — | — | — | — | — | — | — | 0 |
| Debt Securities, Available-for-Sale, Weighted Average Yield | 0 | 0 | — | 0 | 0 | 0 | — | 0 |
| Debt Securities, Available-for-Sale, Maturity, Rolling after 10 Years, Weighted Average Yield | — | — | — | — | — | — | — | 0 |
| Debt Securities, Available-for-Sale, Maturity, Rolling within One Year, Weighted Average Yield | — | — | — | — | — | — | — | 0 |
| Percentage, 90 Days Past Due and Accruing | 1.0% | 1.1% | 1.2% | 1.0% | 1.1% | 1.1% | 1.2% | 1.1% |
| Common stock, par value (in dollars per share) | $0.01 | $0.01 | $0.01 | $0.01 | $0.01 | $0.01 | $0.01 | $0.01 |
| Preferred Stock, Par or Stated Value Per Share | $0.01 | $0.01 | $0.01 | $0.01 | $0.01 | $0.01 | $0.01 | $0.01 |
| Treasury stock, par value (in dollars per share) | $0.01 | $0.01 | $0.01 | $0.01 | $0.01 | $0.01 | $0.01 | $0.01 |
| Nonperforming Loans and Leases Percentage | 0.6% | 0.7% | 0.6% | 0.6% | 0.4% | 0.4% | 0.4% | 0.4% |
| Percentage, Nonperforming Loans Without an Allowance | 0.2% | 0.3% | 0.3% | 0.2% | 0.1% | 0.1% | 0.2% | 0.2% |
| Debt securities, held-to-maturity, allowance for credit loss (less than) | — | — | — | — | — | — | — | $0 |
| 1-5 years | — | — | — | — | — | — | — | 0 |
| Within 1 year | — | — | — | — | — | — | — | 0 |
| Derivative asset fair value of collateral | $9M | $11M | $22M | $5M | $8M | $1M | $0 | $0 |
| Derivative liability fair value of collateral | $24M | $27M | $53M | $13M | $18M | $0 | $0 | $0 |
| 1 Year or Less | — | — | — | — | — | — | — | $0 |
| After 1 Year through 5 Years | — | — | — | — | — | — | — | $0 |
| Repurchase Agreement, Collateral, Right To Reclaim Cash, Offset | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 |
| Securities Sold Under Agreements To Repurchase Amount Offset Against Collateral | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 |
