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Other Assets (Schedule of Equity Securities without Readily Determinable Fair Value) (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023
Other Assets [Abstract] |  |  |
FRB stock | $ 411,000,000 |  | $ 392,000,000
FHLB stock | 230,000,000 |  | 392,000,000
Equity investments without a readily determinable fair value |  |  |
Cost basis at acquisition | 76,000,000 |  | 74,000,000
Upward adjustments | 53,000,000 |  | 51,000,000
Downward adjustments (including impairment) | (23,000,000) |  | (23,000,000)
Carrying amount, equity investments without a readily determinable fair value | 106,000,000 |  | 102,000,000
Nonmarketable equity investments | 747,000,000 |  | $ 886,000,000
Upward adjustments | 1,000,000 | $ 5,000,000 |
Downward adjustments (including impairment) | 0 | (17,000,000) |
Impairment of FHLB and FRB stock | $ 0 | $ 0 |

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- Definition Amount of investment in equity security without readily determinable fair value. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 321 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479536/321-10-50-3 + Details
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