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Fair Value (Fair Value Option - Fair Value and Principal Balances) (Details) - USD ($) $ in Millions | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Loans |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair value - assets | $ 1,292 | $ 1,501
Aggregate unpaid principal balance of assets for which fair value option was elected | 1,560 | 1,804
Fair value option aggregate difference assets | (268) | (303)
Other assets |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair value - assets | 85 | 105
Aggregate unpaid principal balance of assets for which fair value option was elected | 84 | 107
Fair value option aggregate difference assets | 1 | (2)
Other borrowed funds |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair value of liabilities for which fair value option was elected | 21 | 30
Aggregate unpaid principal balance, other borrowed funds | 22 | 30
Difference, Other borrowed funds | (1) |
Other liabilities |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair value of liabilities for which fair value option was elected | 121 |
Difference, Other borrowed funds | 121 |
Accruing loans less than 90 days past due | Loans |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair value - assets | 440 | 487
Aggregate unpaid principal balance of assets for which fair value option was elected | 451 | 498
Fair value option aggregate difference assets | (11) | (11)
Accruing loans 90 days or more past due | Loans |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair value - assets | 168 | 262
Aggregate unpaid principal balance of assets for which fair value option was elected | 181 | 278
Fair value option aggregate difference assets | (13) | (16)
Nonaccrual loans | Loans |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair value - assets | 684 | 752
Aggregate unpaid principal balance of assets for which fair value option was elected | 928 | 1,028
Fair value option aggregate difference assets | (244) | (276)
Residential mortgage loans held for sale | Loans held for sale |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair value - assets | 876 | 1,302
Aggregate unpaid principal balance of assets for which fair value option was elected | 892 | 1,282
Fair value option aggregate difference assets | (16) | 20
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 | 802 | 1,249
Aggregate unpaid principal balance of assets for which fair value option was elected | 806 | 1,219
Fair value option aggregate difference assets | (4) | 30
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 | 6
Aggregate unpaid principal balance of assets for which fair value option was elected | 11 | 6
Residential mortgage loans held for sale | Nonaccrual loans | Loans held for sale |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair value - assets | 63 | 47
Aggregate unpaid principal balance of assets for which fair value option was elected | 75 | 57
Fair value option aggregate difference assets | (12) | (10)
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 | 106 | 575
Aggregate unpaid principal balance of assets for which fair value option was elected | 135 | 580
Fair value option aggregate difference assets | $ (29) | $ (5)

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