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Derivative Financial Instruments - Risk Participation Agreements and Total Return Swaps (Details) - USD ($) $ in Millions | Jun. 30, 2026 | Dec. 31, 2025
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Total return swaps |  |
Credit Derivatives [Line Items] |  |
Cash received for variation margin | $ 34 | $ 31
Cash and other collateral received for initial margin | 488 | 471
Risk Participation Agreements Sold |  |
Credit Derivatives [Line Items] |  |
Maximum potential amount of exposure | $ 377 | $ 554

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