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Derivative Financial Instruments - Collateral and Credit Default Swaps (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Securities pledged as collateral    
Derivatives, Fair Value [Line Items]    
Securities held as collateral $ 5 $ 11
Securities pledged as collateral 171 201
Over the counter | Cash collateral, included in Payables    
Derivatives, Fair Value [Line Items]    
Securities held as collateral 49 84
Cleared derivative contract | Cash collateral, included in Payables    
Derivatives, Fair Value [Line Items]    
Securities held as collateral $ 56 $ 147