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Fair Value (Fair Value Option - Fair Value and Principal Balances) (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Loans |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair value - assets | $ 1,191 | $ 1,238
Aggregate unpaid principal balance of assets for which fair value option was elected | 1,407 | 1,469
Fair value option aggregate difference assets | (216) | (231)
Other assets |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair value - assets | 129 | 85
Aggregate unpaid principal balance of assets for which fair value option was elected | 132 | 69
Fair value option aggregate difference assets | (3) | 16
Other borrowed funds |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair value of liabilities for which fair value option was elected | 32 | 39
Aggregate unpaid principal balance, other borrowed funds | 33 | 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 | 104 | 124
Difference, Other borrowed funds | 104 | 124
Accruing loans less than 90 days past due | Loans |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair value - assets | 607 | 507
Aggregate unpaid principal balance of assets for which fair value option was elected | 646 | 520
Fair value option aggregate difference assets | (39) | (13)
Accruing loans 90 days or more past due | Loans |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair value - assets | 119 | 146
Aggregate unpaid principal balance of assets for which fair value option was elected | 130 | 156
Fair value option aggregate difference assets | (11) | (10)
Nonaccrual loans | Loans |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair value - assets | 465 | 585
Aggregate unpaid principal balance of assets for which fair value option was elected | 631 | 793
Fair value option aggregate difference assets | (166) | (208)
Residential mortgage loans held for sale | Loans held for sale |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair value - assets | 642 | 474
Aggregate unpaid principal balance of assets for which fair value option was elected | 645 | 478
Fair value option aggregate difference assets | (3) | (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 | 604 | 432
Aggregate unpaid principal balance of assets for which fair value option was elected | 601 | 429
Fair value option aggregate difference assets | 3 | 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 | 8 | 6
Aggregate unpaid principal balance of assets for which fair value option was elected | 8 | 6
Residential mortgage loans held for sale | Nonaccrual loans | Loans held for sale |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair value - assets | 30 | 36
Aggregate unpaid principal balance of assets for which fair value option was elected | 36 | 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 | 295 | 238
Aggregate unpaid principal balance of assets for which fair value option was elected | 289 | 228
Fair value option aggregate difference assets | $ 6 | $ 10

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