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Fair Value (Fair Value Option - Fair Value and Principal Balances) (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Loans Held For Sale | Residential Mortgages |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair Value - Assets | $ 855 | $ 819
Aggregate Unpaid Principal Balance - Assets | 821 | 798
Difference - Assets | 34 | 21
Loans Held For Sale | Commercial Mortgage |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair Value - Assets | 362 | 246
Aggregate Unpaid Principal Balance - Assets | 376 | 265
Difference - Assets | (14) | (19)
Loans Held For Sale | Accruing loans less than 90 days past due | Residential Mortgages |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair Value - Assets | 831 | 813
Aggregate Unpaid Principal Balance - Assets | 793 | 792
Difference - Assets | 38 | 21
Loans Held For Sale | Accruing loans less than 90 days past due | Commercial Mortgage |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair Value - Assets | 357 | 245
Aggregate Unpaid Principal Balance - Assets | 370 | 263
Difference - Assets | (13) | (18)
Loans Held For Sale | Accruing loans 90 days or more past due | Residential Mortgages |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair Value - Assets | 4 | 2
Aggregate Unpaid Principal Balance - Assets | 4 | 2
Loans Held For Sale | Nonaccrual loans | Residential Mortgages |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair Value - Assets | 20 | 4
Aggregate Unpaid Principal Balance - Assets | 24 | 4
Difference - Assets | (4) |
Loans Held For Sale | Nonaccrual loans | Commercial Mortgage |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair Value - Assets | 5 | 1
Aggregate Unpaid Principal Balance - Assets | 6 | 2
Difference - Assets | (1) | (1)
Loans | Residential Mortgages |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair Value - Assets | 1,365 | 742
Aggregate Unpaid Principal Balance - Assets | 1,645 | 865
Difference - Assets | (280) | (123)
Loans | Accruing loans less than 90 days past due | Residential Mortgages |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair Value - Assets | 519 | 291
Aggregate Unpaid Principal Balance - Assets | 530 | 304
Difference - Assets | (11) | (13)
Loans | Accruing loans 90 days or more past due | Residential Mortgages |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair Value - Assets | 283 | 285
Aggregate Unpaid Principal Balance - Assets | 295 | 296
Difference - Assets | (12) | (11)
Loans | Nonaccrual loans | Residential Mortgages |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair Value - Assets | 563 | 166
Aggregate Unpaid Principal Balance - Assets | 820 | 265
Difference - Assets | (257) | (99)
Other assets |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair Value - Assets | 81 | 132
Aggregate Unpaid Principal Balance - Assets | 69 | 125
Difference - Assets | 12 | 7
Other borrowed funds |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair Value - Liabilities | 32 | 63
Aggregate Unpaid Principal Balance - Liabilities | 33 | 64
Difference - Liabilities | $ (1) | $ (1)

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