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Fair Value (Fair Value Option - Fair Value and Principal Balances) (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Loans Held For Sale | Residential Mortgages |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair Value - Assets | $ 819 | $ 495
Aggregate Unpaid Principal Balance - Assets | 798 | 478
Difference - Assets | 21 | 17
Loans Held For Sale | Commercial Mortgage |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair Value - Assets | 246 | 396
Aggregate Unpaid Principal Balance - Assets | 265 | 411
Difference - Assets | (19) | (15)
Loans Held For Sale | Performing loans | Residential Mortgages |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair Value - Assets | 813 | 489
Aggregate Unpaid Principal Balance - Assets | 792 | 472
Difference - Assets | 21 | 17
Loans Held For Sale | Performing loans | Commercial Mortgage |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair Value - Assets | 245 | 396
Aggregate Unpaid Principal Balance - Assets | 263 | 411
Difference - Assets | (18) | (15)
Loans Held For Sale | Accruing loans 90 days or more past due | Residential Mortgages |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair Value - Assets | 2 | 2
Aggregate Unpaid Principal Balance - Assets | 2 | 2
Loans Held For Sale | Nonaccrual loans | Residential Mortgages |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair Value - Assets | 4 | 4
Aggregate Unpaid Principal Balance - Assets | 4 | 4
Difference - Assets |  |
Loans Held For Sale | Nonaccrual loans | Commercial Mortgage |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair Value - Assets | 1 |
Aggregate Unpaid Principal Balance - Assets | 2 |
Difference - Assets | (1) |
Loans | Residential Mortgages |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair Value - Assets | 742 | 782
Aggregate Unpaid Principal Balance - Assets | 865 | 919
Difference - Assets | (123) | (137)
Loans | Performing loans | Residential Mortgages |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair Value - Assets | 291 | 279
Aggregate Unpaid Principal Balance - Assets | 304 | 298
Difference - Assets | (13) | (19)
Loans | Accruing loans 90 days or more past due | Residential Mortgages |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair Value - Assets | 285 | 321
Aggregate Unpaid Principal Balance - Assets | 296 | 329
Difference - Assets | (11) | (8)
Loans | Nonaccrual loans | Residential Mortgages |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair Value - Assets | 166 | 182
Aggregate Unpaid Principal Balance - Assets | 265 | 292
Difference - Assets | (99) | (110)
Other assets |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair Value - Assets | 132 | 156
Aggregate Unpaid Principal Balance - Assets | 125 | 176
Difference - Assets | 7 | (20)
Other borrowed funds |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair Value - Liabilities | 63 | 64
Aggregate Unpaid Principal Balance - Liabilities | 64 | 65
Difference - Liabilities | $ (1) | $ (1)

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