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Fair Value Measurements - Difference Between the Aggregate Fair Value and the Aggregate Unpaid Principal Balance Loans Measured at Fair Value (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Residential mortgage loans    
Aggregate fair value    
Loans measured at fair value $ 1,320 $ 716
Past due loans of 90 days or more 2 2
Nonaccrual loans 1 2
Aggregate unpaid principal balance    
Loans measured at fair value 1,285 696
Past due loans of 90 days or more 2 2
Nonaccrual loans 1 2
Difference    
Loans measured at fair value 35 20
Past due loans of 90 days or more 0 0
Nonaccrual loans 0 0
Commercial loans    
Aggregate fair value    
Loans measured at fair value 1 7
Aggregate unpaid principal balance    
Loans measured at fair value 1 7
Difference    
Loans measured at fair value $ 0 $ 0