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Fair Value (Fair Value Option - Fair Value and Principal Balances) (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Loans |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair value - assets | $ 1,173 | $ 1,238
Aggregate unpaid principal balance of assets for which fair value option was elected | 1,382 | 1,469
Fair value option aggregate difference assets | (209) | (231)
Other assets |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair value - assets | 113 | 85
Aggregate unpaid principal balance of assets for which fair value option was elected | 104 | 69
Fair value option aggregate difference assets | 9 | 16
Other borrowed funds |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair value of liabilities for which fair value option was elected | 29 | 39
Aggregate unpaid principal balance, other borrowed funds | 30 | 40
Difference, Other borrowed funds | (1) | (1)
Other liabilities |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair value of liabilities for which fair value option was elected | 98 | 124
Difference, Other borrowed funds | 98 | 124
Accruing loans less than 90 days past due | Loans |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair value - assets | 505 | 507
Aggregate unpaid principal balance of assets for which fair value option was elected | 518 | 520
Fair value option aggregate difference assets | (13) | (13)
Accruing loans 90 days or more past due | Loans |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair value - assets | 118 | 146
Aggregate unpaid principal balance of assets for which fair value option was elected | 129 | 156
Fair value option aggregate difference assets | (11) | (10)
Nonaccrual loans | Loans |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair value - assets | 550 | 585
Aggregate unpaid principal balance of assets for which fair value option was elected | 735 | 793
Fair value option aggregate difference assets | (185) | (208)
Residential mortgage loans held for sale | Loans held for sale |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair value - assets | 658 | 474
Aggregate unpaid principal balance of assets for which fair value option was elected | 654 | 478
Fair value option aggregate difference assets | 4 | (4)
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 | 623 | 432
Aggregate unpaid principal balance of assets for which fair value option was elected | 613 | 429
Fair value option aggregate difference assets | 10 | 3
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 | 6 | 6
Aggregate unpaid principal balance of assets for which fair value option was elected | 6 | 6
Residential mortgage loans held for sale | Nonaccrual loans | Loans held for sale |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair value - assets | 29 | 36
Aggregate unpaid principal balance of assets for which fair value option was elected | 35 | 43
Fair value option aggregate difference assets | (6) | (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 | 77 | 238
Aggregate unpaid principal balance of assets for which fair value option was elected | 77 | 228
Fair value option aggregate difference assets |  | $ 10

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