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Derivative Financial Instruments - Narrative (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Securities pledged as collateral    
Derivatives, Fair Value [Line Items]    
Securities held as collateral $ 0 $ 4
Securities pledged as collateral 222 159
Over the counter | Cash collateral, included in Payables    
Derivatives, Fair Value [Line Items]    
Securities held as collateral 2 33
Cleared derivative contract | Cash collateral, included in Payables    
Derivatives, Fair Value [Line Items]    
Securities held as collateral $ 94 $ 56