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Fair Value (Fair Value Option - Fair Value and Principal Balances) (Details) - USD ($) $ in Millions | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Loans |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair value - assets | $ 1,259 | $ 1,310
Aggregate unpaid principal balance of assets for which fair value option was elected | 1,507 | 1,568
Fair value option aggregate difference assets | (248) | (258)
Other assets |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair value - assets | 64 | 80
Aggregate unpaid principal balance of assets for which fair value option was elected | 65 | 80
Fair value option aggregate difference assets | (1) |
Other borrowed funds |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair value of liabilities for which fair value option was elected | 32 | 31
Aggregate unpaid principal balance, other borrowed funds | 33 | 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 | 127 | 196
Difference, Other borrowed funds | 127 | 196
Accruing loans less than 90 days past due | Loans |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair value - assets | 510 | 509
Aggregate unpaid principal balance of assets for which fair value option was elected | 523 | 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 | 132 | 155
Aggregate unpaid principal balance of assets for which fair value option was elected | 143 | 167
Fair value option aggregate difference assets | (11) | (12)
Nonaccrual loans | Loans |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair value - assets | 617 | 646
Aggregate unpaid principal balance of assets for which fair value option was elected | 841 | 880
Fair value option aggregate difference assets | (224) | (234)
Residential mortgage loans held for sale | Loans held for sale |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair value - assets | 686 | 654
Aggregate unpaid principal balance of assets for which fair value option was elected | 713 | 687
Fair value option aggregate difference assets | (27) | (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 | 651 | 609
Aggregate unpaid principal balance of assets for which fair value option was elected | 671 | 633
Fair value option aggregate difference assets | (20) | (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 | 2 | 5
Aggregate unpaid principal balance of assets for which fair value option was elected | 2 | 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 | 64 | 276
Aggregate unpaid principal balance of assets for which fair value option was elected | 95 | 300
Fair value option aggregate difference assets | (31) | (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 | 49 | 261
Aggregate unpaid principal balance of assets for which fair value option was elected | 51 | 256
Fair value option aggregate difference assets | (2) | 5
Commercial mortgage loans held for sale | Nonaccrual loans | Loans held for sale |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair value - assets | 15 | 15
Aggregate unpaid principal balance of assets for which fair value option was elected | 44 | 44
Fair value option aggregate difference assets | $ (29) | $ (29)

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