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Fair Value Measurements - Difference Between the Aggregate Fair Value and the Aggregate Unpaid Principal Balance for Residential Mortgage Loans Measured at Fair Value (Details) - Residential mortgage loans - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Aggregate  Fair Value    
Loans measured at fair value $ 682 $ 450
Past due loans of 30-89 days 1 1
Past due loans of 90 days or more 1  
Nonaccrual loans 2 2
Aggregate Unpaid Principal Balance    
Loans measured at fair value 693 456
Past due loans of 30-89 days 1 1
Past due loans of 90 days or more 1  
Nonaccrual loans 2 2
Difference    
Loans measured at fair value (11) (6)
Past due loans of 30-89 days 0 0
Past due loans of 90 days or more 0  
Nonaccrual loans $ 0 $ 0