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Fair Value (Fair Value Option - Changes in Fair Value) (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2023 | Mar. 31, 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 | $ 15 | $ (40)
Loans held for sale | Commercial mortgage loans held for sale |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Gains (losses) - FVO: changes in fair value | 1 | 6
Loans |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Gains (losses) - FVO: changes in fair value | 4 | 21
Other assets |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Gains (losses) - FVO: changes in fair value | (14) | $ (7)
Other liabilities |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Gains (losses) - FVO: changes in fair value | $ (20) |

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- Definition For each line item in the statement of financial position, the amounts of gains and losses from fair value changes included in earnings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=123596393&loc=d3e14172-108612 + Details
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