Other Assets - Schedule of Equity Securities without Readily Determinable Fair Value (Details) - USD ($) |
3 Months Ended | 6 Months Ended | |||
|---|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
Dec. 31, 2025 |
|
| Other Assets [Abstract] | |||||
| FRB stock | $ 454,000,000 | $ 454,000,000 | $ 452,000,000 | ||
| FHLB stock | 393,000,000 | 393,000,000 | 359,000,000 | ||
| Equity investments without a readily determinable fair value | |||||
| Cost basis | 95,000,000 | 95,000,000 | 94,000,000 | ||
| Upward adjustments | 57,000,000 | 57,000,000 | 57,000,000 | ||
| Downward adjustments (including impairment) | (39,000,000) | (39,000,000) | (40,000,000) | ||
| Carrying amount, equity investments without a readily determinable fair value | 113,000,000 | 113,000,000 | 111,000,000 | ||
| Nonmarketable equity investments | 960,000,000 | 960,000,000 | $ 922,000,000 | ||
| Upward adjustments | 4,000,000 | $ 0 | 4,000,000 | $ 0 | |
| Downward adjustments (including impairment) | (1,000,000) | (2,000,000) | (2,000,000) | (2,000,000) | |
| Impairment of FHLB and FRB stock | $ 0 | $ 0 | $ 0 | $ 0 | |
| X | ||||||||||
- Definition Equity Securities Without Readily Determinable Fair Value, Downward Price Adjustment And Accumulated Impairment Loss, Cumulative Amount No definition available.
|
| X | ||||||||||
- Definition Equity Securities Without Readily Determinable Fair Value, Downward Price Adjustment And Impairment Loss, Annual Amount No definition available.
|
| X | ||||||||||
- Definition Equity Securities Without Readily Determinable Fair Value, Initial Cost Basis No definition available.
|
| X | ||||||||||
- Definition Federal Home Loan Bank Stock And Federal Reserve Bank Stock, Impairment Loss No definition available.
|
| X | ||||||||||
- Definition Nonmarketable Equity Investments No definition available.
|
| X | ||||||||||
- Definition Amount of investment in equity security without readily determinable fair value. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition Amount of gain from upward price adjustment on investment in equity security without readily determinable fair value. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Amount of cumulative gain from upward price adjustment on investment in equity security without readily determinable fair value. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- 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). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Federal Reserve Bank stock represents an equity interest in the Federal Reserve Bank. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity). Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
|
| X | ||||||||||
- References No definition available.
|