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Fair Value (Fair Value Option - Changes in Fair Value) (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Loans held for sale | Residential mortgage loans held for sale |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Gains (losses) - FVO: changes in fair value | $ 16 | $ 46
Loans held for sale | Commercial mortgage loans held for sale |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Gains (losses) - FVO: changes in fair value | 20 | 48
Loans |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Gains (losses) - FVO: changes in fair value | 14 | 18
Other assets |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Gains (losses) - FVO: changes in fair value | $ 14 | $ (36)

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