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Derivative Financial Instruments - Collateral (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Payables under securities loan agreement, including collateral held | Over the Counter    
Derivatives, Fair Value [Line Items]    
Securities held as collateral $ 3 $ 33
Payables under securities loan agreement, including collateral held | Cleared Derivative Contract    
Derivatives, Fair Value [Line Items]    
Securities held as collateral 77 56
Securities pledged    
Derivatives, Fair Value [Line Items]    
Securities held as collateral 0 4
Securities pledged as collateral $ 204 $ 159