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Fair Value (Fair Value Option - Fair Value and Principal Balances) (Details) - USD ($) $ in Millions | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Loans |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair value - assets | $ 1,395 | $ 1,501
Aggregate unpaid principal balance of assets for which fair value option was elected | 1,678 | 1,804
Fair value option aggregate difference assets | (283) | (303)
Other assets |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair value - assets | 95 | 105
Aggregate unpaid principal balance of assets for which fair value option was elected | 95 | 107
Fair value option aggregate difference assets |  | (2)
Other borrowed funds |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair value of liabilities for which fair value option was elected | 31 | 30
Aggregate unpaid principal balance, other borrowed funds | 32 | 30
Difference, Other borrowed funds | (1) |
Accruing loans less than 90 days past due | Loans |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair value - assets | 441 | 487
Aggregate unpaid principal balance of assets for which fair value option was elected | 452 | 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 | 225 | 262
Aggregate unpaid principal balance of assets for which fair value option was elected | 238 | 278
Fair value option aggregate difference assets | (13) | (16)
Nonaccrual loans | Loans |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair value - assets | 729 | 752
Aggregate unpaid principal balance of assets for which fair value option was elected | 988 | 1,028
Fair value option aggregate difference assets | (259) | (276)
Residential mortgage loans held for sale | Loans held for sale |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair value - assets | 1,039 | 1,302
Aggregate unpaid principal balance of assets for which fair value option was elected | 1,063 | 1,282
Fair value option aggregate difference assets | (24) | 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 | 976 | 1,249
Aggregate unpaid principal balance of assets for which fair value option was elected | 990 | 1,219
Fair value option aggregate difference assets | (14) | 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 | 12 | 6
Aggregate unpaid principal balance of assets for which fair value option was elected | 12 | 6
Residential mortgage loans held for sale | Nonaccrual loans | Loans held for sale |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair value - assets | 51 | 47
Aggregate unpaid principal balance of assets for which fair value option was elected | 61 | 57
Fair value option aggregate difference assets | (10) | (10)
Commercial mortgage loans held for sale | Loans held for sale |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair value - assets | 307 | 575
Aggregate unpaid principal balance of assets for which fair value option was elected | 331 | 580
Fair value option aggregate difference assets | (24) | (5)
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 | 307 | 575
Aggregate unpaid principal balance of assets for which fair value option was elected | 331 | 580
Fair value option aggregate difference assets | $ (24) | $ (5)

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