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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, 2021
Dec. 31, 2020
Aggregate  Fair Value    
Loans measured at fair value $ 1,177 $ 1,642
Past due loans of 90 days or more 3 3
Nonaccrual loans 0 0
Aggregate Unpaid Principal Balance    
Loans measured at fair value 1,149 1,567
Past due loans of 90 days or more 3 3
Nonaccrual loans 0 0
Difference    
Loans measured at fair value 28 75
Past due loans of 90 days or more 0 0
Nonaccrual loans $ 0 $ 0