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Fair Value (Fair Value Option - Changes in Fair Value) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Loans held for sale | Residential mortgage loans held for sale |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Gains (losses) - FVO: changes in fair value | $ (3) | $ (29) | $ 14 | $ (92)
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 | 14 | 29 | 34
Loans |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Gains (losses) - FVO: changes in fair value | 8 | 1 | 17 | 37
Other assets |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Gains (losses) - FVO: changes in fair value |  | (3) | (12) | (21)
Other liabilities |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Gains (losses) - FVO: changes in fair value |  | $ (24) | $ (41) | $ (40)

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