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Fair Value (Fair Value Option - Changes in Fair Value) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Loans Held For Sale | Residential Mortgages |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |
Gains (Losses) - FVO: Changes in Fair Value | $ (80) | $ 152 | $ 198
Loans Held For Sale | Commercial Mortgages |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |
Gains (Losses) - FVO: Changes in Fair Value | 52 | 115 | 128
Loans | Residential Mortgages |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |
Gains (Losses) - FVO: Changes in Fair Value | 42 | 80 | 44
Other assets |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |
Gains (Losses) - FVO: Changes in Fair Value | (16) | 28 | (3)
Other liabilities |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |
Gains (Losses) - FVO: Changes in Fair Value | $ (67) |  |

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