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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
Mar. 31, 2022
Dec. 31, 2021
Aggregate fair value    
Loans measured at fair value $ 1,003 $ 1,177
Past due loans of 90 days or more 3 3
Non accrual loans 1 0
Aggregate unpaid principal balance    
Loans measured at fair value 1,013 1,149
Past due loans of 90 days or more 3 3
Non accrual loans 1 0
Difference    
Loans measured at fair value (10) 28
Past due loans of 90 days or more 0 0
Non accrual loans $ 0 $ 0