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Fair Value (Fair Value Option - Fair Value and Principal Balances) (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Other assets |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair value - assets | $ 98 | $ 81
Aggregate unpaid principal balance of assets for which fair value option was elected | 102 | 69
Fair value option aggregate difference assets | (4) | 12
Other borrowed funds |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair value of liabilities for which fair value option was elected | 26 | 32
Aggregate unpaid principal balance, other borrowed funds | 26 | 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 | 1,504 | 855
Aggregate unpaid principal balance of assets for which fair value option was elected | 1,466 | 821
Fair value option aggregate difference assets | 38 | 34
Residential mortgage loans held for sale | Loans |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair value - assets | 1,727 | 1,365
Aggregate unpaid principal balance of assets for which fair value option was elected | 2,054 | 1,645
Fair value option aggregate difference assets | (327) | (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 | 1,451 | 831
Aggregate unpaid principal balance of assets for which fair value option was elected | 1,404 | 793
Fair value option aggregate difference assets | 47 | 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 | 714 | 519
Aggregate unpaid principal balance of assets for which fair value option was elected | 733 | 530
Fair value option aggregate difference assets | (19) | (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 | 290 | 283
Aggregate unpaid principal balance of assets for which fair value option was elected | 308 | 295
Fair value option aggregate difference assets | (18) | (12)
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)
Residential mortgage loans held for sale | Nonaccrual loans | Loans |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair value - assets | 723 | 563
Aggregate unpaid principal balance of assets for which fair value option was elected | 1,013 | 820
Fair value option aggregate difference assets | (290) | (257)
Commercial real estate | Loans held for sale |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair value - assets | 217 | 362
Aggregate unpaid principal balance of assets for which fair value option was elected | 234 | 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 | 217 | 357
Aggregate unpaid principal balance of assets for which fair value option was elected | 234 | 370
Fair value option aggregate difference assets | (17) | (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)
Other consumer loans held for sale | Loans held for sale |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair value - assets | 239 |
Aggregate unpaid principal balance of assets for which fair value option was elected | 253 |
Fair value option aggregate difference assets | (14) |
Other consumer 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 | 239 |
Aggregate unpaid principal balance of assets for which fair value option was elected | 252 |
Fair value option aggregate difference assets | (13) |
Other consumer 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 |  |
Aggregate unpaid principal balance of assets for which fair value option was elected | 1 |
Fair value option aggregate difference assets | $ (1) |

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