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Investment Securities - Additional Information (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jan. 31, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Investments, Unrealized Loss Position |  |  |  |  |  |
Accrued interest receivables on investment securities |  | $ 144 |  | $ 144 |  | $ 162
Transfer of available-for-sale securities to held-to-maturity | $ 12,600 |  |  |  |  |
OCI, available-for-sale debt securities transferred to held-to-maturity, pretax unrealized losses | $ 994 |  |  |  |  |
Impairment losses |  | 0 | $ 11 | 0 | $ 21 |
Investment securities, fair value |  | 27,900 |  | 27,900 |  | 30,000
Unrealized losses |  | 3,174 |  | 3,174 |  | 4,337
Available-for-sale debt securities transferred to held-to-maturity securities |  |  |  |  |  |
Investments, Unrealized Loss Position |  |  |  |  |  |
AOCI offset, unamortized portion of unrealized losses on securities |  | 774 |  | 774 |  | 865
Non-rated Securities |  |  |  |  |  |
Investments, Unrealized Loss Position |  |  |  |  |  |
Unrealized losses |  | $ 25 |  | $ 25 |  | $ 34

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