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Fair Value (Fair Value Option for Residential Mortgage Loans) (Details) - Residential mortgage loans - FVO - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Fair Value, Option, Quantitative Disclosures [Line Items]    
Unpaid principal balance $ 190 $ 209
Difference between estimated fair value and unpaid principal balance (15) (21)
Carrying value at estimated fair value 175 188
Loans in nonaccrual status 47 47
Loans more than 90 days past due 18 18
Loans in nonaccrual status or more than 90 days past due, or both — difference between aggregate estimated fair value and unpaid principal balance $ (16) $ (19)