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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, 2022 | Mar. 31, 2021
Loans held for sale | Residential mortgage loans held for sale |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Gains (losses) - FVO: changes in fair value | $ (40) | $ 16
Loans held for sale | Commercial mortgage loans held for sale |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Gains (losses) - FVO: changes in fair value | 6 | 20
Loans |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Gains (losses) - FVO: changes in fair value | 21 | 14
Other assets |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Gains (losses) - FVO: changes in fair value | $ (7) | $ 14

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