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Fair Value (Fair Value Option - Fair Value and Principal Balances) (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Other assets |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair value - assets | $ 93 | $ 81
Aggregate unpaid principal balance of assets for which fair value option was elected | 91 | 69
Fair value option aggregate difference assets | 2 | 12
Other borrowed funds |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair value of liabilities for which fair value option was elected | 28 | 32
Aggregate unpaid principal balance, other borrowed funds | 28 | 33
Difference, Other borrowed funds |  | (1)
Residential mortgage loans held for sale | Loans held for sale |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair value - assets | 1,252 | 855
Aggregate unpaid principal balance of assets for which fair value option was elected | 1,229 | 821
Fair value option aggregate difference assets | 23 | 34
Residential mortgage loans held for sale | Loans |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair value - assets | 1,441 | 1,365
Aggregate unpaid principal balance of assets for which fair value option was elected | 1,737 | 1,645
Fair value option aggregate difference assets | (296) | (280)
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 | 1,204 | 831
Aggregate unpaid principal balance of assets for which fair value option was elected | 1,172 | 793
Fair value option aggregate difference assets | 32 | 38
Residential mortgage loans held for sale | Accruing loans less than 90 days past due | Loans |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair value - assets | 622 | 519
Aggregate unpaid principal balance of assets for which fair value option was elected | 632 | 530
Fair value option aggregate difference assets | (10) | (11)
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 | 3 | 4
Aggregate unpaid principal balance of assets for which fair value option was elected | 3 | 4
Residential mortgage loans held for sale | Accruing loans 90 days or more past due | Loans |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair value - assets | 246 | 283
Aggregate unpaid principal balance of assets for which fair value option was elected | 260 | 295
Fair value option aggregate difference assets | (14) | (12)
Residential mortgage loans held for sale | Nonaccrual loans | Loans held for sale |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair value - assets | 45 | 20
Aggregate unpaid principal balance of assets for which fair value option was elected | 54 | 24
Fair value option aggregate difference assets | (9) | (4)
Residential mortgage loans held for sale | Nonaccrual loans | Loans |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair value - assets | 573 | 563
Aggregate unpaid principal balance of assets for which fair value option was elected | 845 | 820
Fair value option aggregate difference assets | (272) | (257)
Commercial real estate | Loans held for sale |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair value - assets | 385 | 362
Aggregate unpaid principal balance of assets for which fair value option was elected | 402 | 376
Fair value option aggregate difference assets | (17) | (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 | 380 | 357
Aggregate unpaid principal balance of assets for which fair value option was elected | 396 | 370
Fair value option aggregate difference assets | (16) | (13)
Commercial real estate | Nonaccrual loans | Loans held for sale |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair value - assets | 5 | 5
Aggregate unpaid principal balance of assets for which fair value option was elected | 6 | 6
Fair value option aggregate difference assets | $ (1) | $ (1)

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