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Fair Value (Fair Value Option - Fair Value and Principal Balances) (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Loans |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair value - assets | $ 1,609 | $ 1,365
Aggregate unpaid principal balance of assets for which fair value option was elected | 1,918 | 1,645
Fair value option aggregate difference assets | (309) | (280)
Other assets |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair value - assets | 96 | 81
Aggregate unpaid principal balance of assets for which fair value option was elected | 93 | 69
Fair value option aggregate difference assets | 3 | 12
Other borrowed funds |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair value of liabilities for which fair value option was elected | 31 | 32
Aggregate unpaid principal balance, other borrowed funds | 31 | 33
Difference, Other borrowed funds |  | (1)
Accruing loans less than 90 days past due | Loans |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair value - assets | 652 | 519
Aggregate unpaid principal balance of assets for which fair value option was elected | 669 | 530
Fair value option aggregate difference assets | (17) | (11)
Accruing loans 90 days or more past due | Loans |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair value - assets | 260 | 283
Aggregate unpaid principal balance of assets for which fair value option was elected | 278 | 295
Fair value option aggregate difference assets | (18) | (12)
Nonaccrual loans | Loans |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair value - assets | 697 | 563
Aggregate unpaid principal balance of assets for which fair value option was elected | 971 | 820
Fair value option aggregate difference assets | (274) | (257)
Residential mortgage loans held for sale | Loans held for sale |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair value - assets | 1,519 | 855
Aggregate unpaid principal balance of assets for which fair value option was elected | 1,485 | 821
Fair value option aggregate difference assets | 34 | 34
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 | 1,465 | 831
Aggregate unpaid principal balance of assets for which fair value option was elected | 1,422 | 793
Fair value option aggregate difference assets | 43 | 38
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 | 4 | 4
Aggregate unpaid principal balance of assets for which fair value option was elected | 4 | 4
Residential mortgage loans held for sale | Nonaccrual loans | Loans held for sale |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair value - assets | 50 | 20
Aggregate unpaid principal balance of assets for which fair value option was elected | 59 | 24
Fair value option aggregate difference assets | (9) | (4)
Commercial real estate | Loans held for sale |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair value - assets | 508 | 362
Aggregate unpaid principal balance of assets for which fair value option was elected | 520 | 376
Fair value option aggregate difference assets | (12) | (14)
Commercial real estate | Accruing loans less than 90 days past due | Loans held for sale |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair value - assets | 508 | 357
Aggregate unpaid principal balance of assets for which fair value option was elected | 520 | 370
Fair value option aggregate difference assets | (12) | (13)
Commercial real estate | Nonaccrual loans | Loans held for sale |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair value - assets |  | 5
Aggregate unpaid principal balance of assets for which fair value option was elected |  | 6
Fair value option aggregate difference assets |  | $ (1)

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