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Derivative Financial Instruments - Risk Participation Agreements and Total Return Swaps (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
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