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Derivative Financial Instruments - Collateral and Credit Default Swaps (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Securities pledged as collateral    
Derivatives, Fair Value [Line Items]    
Securities held as collateral $ 2 $ 4
Securities pledged as collateral 156 159
Over the counter | Cash collateral, included in Payables    
Derivatives, Fair Value [Line Items]    
Securities held as collateral 14 33
Cleared derivative contract | Cash collateral, included in Payables    
Derivatives, Fair Value [Line Items]    
Securities held as collateral $ 65 $ 56