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Fair Value (Fair Value Option - Fair Value and Principal Balances) (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Loans |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair value - assets | $ 1,117 | $ 1,156
Aggregate unpaid principal balance of assets for which fair value option was elected | 1,307 | 1,360
Fair value option aggregate difference assets | (190) | (204)
Other assets |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair value - assets | 193 | 133
Aggregate unpaid principal balance of assets for which fair value option was elected | 189 | 142
Fair value option aggregate difference assets | 4 | (9)
Other borrowed funds |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair value of liabilities for which fair value option was elected | 30 | 34
Aggregate unpaid principal balance, other borrowed funds | 31 | 35
Difference, Other borrowed funds | (1) | (1)
Fair Value Of Liabilities For Which Fair Value Option Was Elected | 30 | 34
Other Liabilities With Contractual Unpaid Principal Balance |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair value of liabilities for which fair value option was elected | 28 | 28
Aggregate unpaid principal balance, other borrowed funds | 31 | 32
Difference, Other borrowed funds | (3) | (4)
Fair Value Of Liabilities For Which Fair Value Option Was Elected | 28 | 28
Other Liabilities Without Contractual Unpaid Principal Balance |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair value of liabilities for which fair value option was elected | 121 | 106
Aggregate unpaid principal balance, other borrowed funds | 0 | 0
Difference, Other borrowed funds | 121 | 106
Fair Value Of Liabilities For Which Fair Value Option Was Elected | 121 | 106
Interest-bearing deposits |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair value of liabilities for which fair value option was elected | 7,318 | 0
Aggregate unpaid principal balance, other borrowed funds | 7,316 | 0
Difference, Other borrowed funds | 2 | 0
Fair Value Of Liabilities For Which Fair Value Option Was Elected | 7,318 | 0
Accruing loans less than 90 days past due | Loans |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair value - assets | 741 | 494
Aggregate unpaid principal balance of assets for which fair value option was elected | 823 | 505
Fair value option aggregate difference assets | (82) | (11)
Accruing loans 90 days or more past due | Loans |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair value - assets | 123 | 126
Aggregate unpaid principal balance of assets for which fair value option was elected | 136 | 137
Fair value option aggregate difference assets | (13) | (11)
Nonaccrual loans | Loans |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair value - assets | 253 | 536
Aggregate unpaid principal balance of assets for which fair value option was elected | 348 | 718
Fair value option aggregate difference assets | (95) | (182)
Residential mortgage loans held for sale | Loans held for sale |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair value - assets | 692 | 628
Aggregate unpaid principal balance of assets for which fair value option was elected | 688 | 635
Fair value option aggregate difference assets | 4 | (7)
Residential mortgage loans held for sale | Accruing loans less than 90 days past due | Loans held for sale |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair value - assets | 668 | 588
Aggregate unpaid principal balance of assets for which fair value option was elected | 663 | 588
Fair value option aggregate difference assets | 5 | 0
Residential mortgage loans held for sale | Accruing loans 90 days or more past due | Loans held for sale |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair value - assets | 11 | 11
Aggregate unpaid principal balance of assets for which fair value option was elected | 11 | 11
Fair value option aggregate difference assets | 0 | 0
Residential mortgage loans held for sale | Nonaccrual loans | Loans held for sale |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair value - assets | 13 | 29
Aggregate unpaid principal balance of assets for which fair value option was elected | 14 | 36
Fair value option aggregate difference assets | (1) | (7)
Commercial mortgage loans held for sale | Accruing loans less than 90 days past due | Loans held for sale |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair value - assets | 255 | 203
Aggregate unpaid principal balance of assets for which fair value option was elected | 253 | 200
Fair value option aggregate difference assets | $ 2 | $ 3

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