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Fair Value (Fair Value Option - Changes in Fair Value) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 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 | $ 6 | $ 2 | $ 14 | $ 17
Loans held for sale | Commercial mortgage loans held for sale |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Gains (losses) - FVO: changes in fair value | 14 | 22 | 9 | 23
Loans |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Gains (losses) - FVO: changes in fair value | 6 | 5 | 12 | 9
Other assets |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Gains (losses) - FVO: changes in fair value | (2) | 2 | 3 | (12)
Other liabilities |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Gains (losses) - FVO: changes in fair value | $ (7) | $ (21) | $ (9) | $ (41)

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