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Fair Value (Fair Value Option - Fair Value and Principal Balances) (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Loans |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair value - assets | $ 1,244 | $ 1,310
Aggregate unpaid principal balance of assets for which fair value option was elected | 1,485 | 1,568
Fair value option aggregate difference assets | (241) | (258)
Other assets |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair value - assets | 68 | 80
Aggregate unpaid principal balance of assets for which fair value option was elected | 75 | 80
Fair value option aggregate difference assets | (7) |
Other borrowed funds |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair value of liabilities for which fair value option was elected | 37 | 31
Aggregate unpaid principal balance, other borrowed funds | 38 | 32
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 | 141 | 196
Difference, Other borrowed funds | 141 | 196
Accruing loans less than 90 days past due | Loans |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair value - assets | 505 | 509
Aggregate unpaid principal balance of assets for which fair value option was elected | 518 | 521
Fair value option aggregate difference assets | (13) | (12)
Accruing loans 90 days or more past due | Loans |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair value - assets | 140 | 155
Aggregate unpaid principal balance of assets for which fair value option was elected | 152 | 167
Fair value option aggregate difference assets | (12) | (12)
Nonaccrual loans | Loans |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair value - assets | 599 | 646
Aggregate unpaid principal balance of assets for which fair value option was elected | 815 | 880
Fair value option aggregate difference assets | (216) | (234)
Residential mortgage loans held for sale | Loans held for sale |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair value - assets | 529 | 654
Aggregate unpaid principal balance of assets for which fair value option was elected | 546 | 687
Fair value option aggregate difference assets | (17) | (33)
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 | 486 | 609
Aggregate unpaid principal balance of assets for which fair value option was elected | 496 | 633
Fair value option aggregate difference assets | (10) | (24)
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 | 10 | 5
Aggregate unpaid principal balance of assets for which fair value option was elected | 10 | 5
Residential mortgage loans held for sale | Nonaccrual loans | Loans held for sale |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair value - assets | 33 | 40
Aggregate unpaid principal balance of assets for which fair value option was elected | 40 | 49
Fair value option aggregate difference assets | (7) | (9)
Commercial mortgage loans held for sale | Loans held for sale |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair value - assets | 379 | 276
Aggregate unpaid principal balance of assets for which fair value option was elected | 411 | 300
Fair value option aggregate difference assets | (32) | (24)
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 | 365 | 261
Aggregate unpaid principal balance of assets for which fair value option was elected | 368 | 256
Fair value option aggregate difference assets | (3) | 5
Commercial mortgage loans held for sale | Nonaccrual loans | Loans held for sale |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair value - assets | 14 | 15
Aggregate unpaid principal balance of assets for which fair value option was elected | 43 | 44
Fair value option aggregate difference assets | $ (29) | $ (29)

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