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Investment Securities - Additional Information (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Debt Securities, Available-for-Sale [Line Items] |  |  |
Available-for-sale securities | [1] | $ 89,065 | $ 85,992
Allowance for credit loss on held-to-maturity securities |  | 0 |
Asset Pledged as Collateral |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |
Available-for-sale securities |  | 17,200 | 18,800
Asset Pledged as Collateral with Right |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |
Available-for-sale securities |  | 326 | 320
Available-for-sale and held-to-maturity securities |  | $ 326 | $ 320
[1] | Includes only collateral pledged by the Company where counterparties have the right to sell or pledge the collateral.

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