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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, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 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 | $ 2 | $ (23) | $ 17 | $ (63)
Loans held for sale | Commercial mortgage loans held for sale |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Gains (losses) - FVO: changes in fair value | 22 | 14 | 23 | 20
Loans |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Gains (losses) - FVO: changes in fair value | 5 | 15 | 9 | 36
Other assets |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Gains (losses) - FVO: changes in fair value | 2 | (11) | (12) | (18)
Other liabilities |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Gains (losses) - FVO: changes in fair value | $ (21) | $ (10) | $ (41) | $ (16)

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