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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, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Loans held for sale | Residential mortgage loans held for sale |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Gains (losses) - FVO: changes in fair value | $ 18 | $ (3) | $ 32 | $ 14
Loans held for sale | Commercial mortgage loans held for sale |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Gains (losses) - FVO: changes in fair value | 3 | 6 | 12 | 29
Loans |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Gains (losses) - FVO: changes in fair value | 6 | 8 | 18 | 17
Other assets |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Gains (losses) - FVO: changes in fair value | 17 |  | 20 | (12)
Other liabilities |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Gains (losses) - FVO: changes in fair value | $ (3) |  | $ (12) | $ (41)

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