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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
Sep. 30, 2020
Dec. 31, 2019
Aggregate fair value    
Loans measured at fair value $ 1,646 $ 1,447
Past due loans of 90 days or more 3 2
Non accrual loans 0 1
Aggregate unpaid principal balance    
Loans measured at fair value 1,569 1,410
Past due loans of 90 days or more 3 2
Non accrual loans 0 1
Difference    
Loans measured at fair value 77 37
Past due loans of 90 days or more 0 0
Non accrual loans $ 0 $ 0