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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, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Loans held for sale | Residential mortgage loans held for sale |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Gains (losses) - FVO: changes in fair value | $ (23) | $ 57 | $ (63) | $ 73
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 | 26 | 20 | 46
Loans |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Gains (losses) - FVO: changes in fair value | 15 | 17 | 36 | 31
Other assets |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Gains (losses) - FVO: changes in fair value | (11) | $ 8 | (18) | $ 22
Other liabilities |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Gains (losses) - FVO: changes in fair value | $ (10) |  | $ (16) |

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