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Investment Securities - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025 | Dec. 31, 2025
Investments, Unrealized Loss Position |  |  |  |  |
Accrued interest receivables on investment securities | $ 211 |  | $ 211 |  | $ 139
Impairment losses | 7 | $ 0 | 7 | $ 0 |
Investment securities, fair value | 30,100 |  | 30,100 |  | 28,600
Unrealized losses | 3,170 |  | 3,170 |  | 2,973
Available-for-sale debt securities transferred to held-to-maturity securities |  |  |  |  |
Investments, Unrealized Loss Position |  |  |  |  |
AOCI offset, unamortized portion of unrealized losses on securities | 685 |  | 685 |  | 742
Non-rated Securities |  |  |  |  |
Investments, Unrealized Loss Position |  |  |  |  |
Unrealized losses | $ 24 |  | $ 24 |  | $ 24

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