CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) |
Jun. 30, 2026 |
Dec. 31, 2025 |
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| Statement of Financial Position [Abstract] | |||||
| Debt securities available for sale, amortized cost | $ 3,848,000,000 | $ 3,783,000,000 | |||
| Debt securities available for sale, allowance for credit losses | 0 | 0 | |||
| Debt securities held-to-maturity, fair value | 4,049,000,000 | 3,941,000,000 | |||
| Debt securities held to maturity, allowance for credit losses | 480,000 | 290,000 | |||
| Loans held for sale, fair value | 282,000,000 | 514,000,000 | [1] | ||
| Loans and leases, unearned income | 84,000,000 | 87,000,000 | |||
| Loans and leases, unearned income, fair value | $ 96,000,000 | $ 85,000,000 | |||
| Common stock, par value (USD per share) | $ 0.01 | $ 0.01 | |||
| Common stock, shares authorized (in shares) | 500,000,000 | 500,000,000 | |||
| Common stock, shares issued (in shares) | 375,030,534 | 375,030,534 | |||
| Treasury stock, shares (in shares) | 21,470,450 | 17,727,219 | |||
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| X | ||||||||||
- Definition Face amount or stated value per share of common stock. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition The maximum number of common shares permitted to be issued by an entity's charter and bylaws. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount excluding accrued interest, of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amortized cost excluding accrued interest, before allowance for credit loss, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount, excluding accrued interest, of allowance for credit loss on investment in debt security measured at amortized cost (held-to-maturity). Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition Amount of fee received for commitment to originate or purchase financing receivable where likelihood of commitment being exercised is remote, to be recognized as service income. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition Fair value of investment in debt security measured at amortized cost (held-to-maturity). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Fair value portion of loans held-for-sale including, but not limited to, mortgage loans and finance receivables. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Number of previously issued common shares repurchased by the issuing entity and held in treasury. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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