Derivative Financial Instruments - Risk Participation Agreements and Total Return Swaps (Details) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Risk Participation Agreements Sold
Credit Derivatives [Line Items]
Maximum potential amount of exposure	$ 429	$ 381
Total Return Swap
Credit Derivatives [Line Items]
Cash received for variation margin	15	25
Cash and other collateral received for initial margin	$ 506	$ 329