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Fair Value (Fair Value Option - Changes in Fair Value) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Loans Held For Sale | Residential Mortgages |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |
Gains (Losses) - FVO: Changes in Fair Value | $ 198 | $ 84 | $ 38
Loans Held For Sale | Commercial Mortgages |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |
Gains (Losses) - FVO: Changes in Fair Value | 128 | 61 | 67
Loans | Residential Mortgages |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |
Gains (Losses) - FVO: Changes in Fair Value | 44 | 23 | 24
Other assets |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |
Gains (Losses) - FVO: Changes in Fair Value | $ (3) | $ 40 | $ (40)

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