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Other Assets - Schedule of Equity Securities without Readily Determinable Fair Value (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Other Assets [Abstract] |  |  |  |  |
FRB stock | $ 442,000,000 |  | $ 442,000,000 |  | $ 440,000,000
FHLB stock | 310,000,000 |  | 310,000,000 |  | 258,000,000
Equity investments without a readily determinable fair value |  |  |  |  |
Cost basis | 91,000,000 |  | 91,000,000 |  | 74,000,000
Upward adjustments | 53,000,000 |  | 53,000,000 |  | 53,000,000
Downward adjustments (including impairment) | (38,000,000) |  | (38,000,000) |  | (36,000,000)
Carrying amount, equity investments without a readily determinable fair value | 106,000,000 |  | 106,000,000 |  | 91,000,000
Nonmarketable equity investments | 858,000,000 |  | 858,000,000 |  | $ 789,000,000
Upward adjustments | 0 | $ 1,000,000 | 0 | $ 2,000,000 |
Downward adjustments (including impairment) | 0 | (5,000,000) | (2,000,000) | (19,000,000) |
Impairment of FHLB and FRB stock | $ 0 | $ 0 | $ 0 | $ 0 |

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- Definition Equity Securities Without Readily Determinable Fair Value, Downward Price Adjustment And Impairment Loss, Annual Amount + References No definition available. + Details
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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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- Definition Amount of gain from upward price adjustment on 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 (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479536/321-10-50-3 + Details
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- Definition Federal Home Loan Bank (FHLB) stock represents an equity interest in a FHLB. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 325 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477974/942-325-45-1 + Details
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