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Fair Value (Fair Value Option - Changes in Fair Value) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Loans Held For Sale | Residential Mortgages |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |
Gains (Losses) - FVO: Changes in Fair Value | $ 10 | $ 32 | $ (80)
Loans Held For Sale | Commercial Mortgages |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |
Gains (Losses) - FVO: Changes in Fair Value | 24 | 53 | 52
Loans | Residential Mortgages |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |
Gains (Losses) - FVO: Changes in Fair Value | 21 | 26 | 42
Other assets |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |
Gains (Losses) - FVO: Changes in Fair Value | 25 | 7 | (16)
Other liabilities |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |
Gains (Losses) - FVO: Changes in Fair Value | $ (19) | $ (41) | $ (67)

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