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Fair Value (Fair Value Option for Residential Mortgage Loans) (Details) - Residential mortgage loans - FVO - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Fair Value, Option, Quantitative Disclosures [Line Items]    
Unpaid principal balance $ 324 $ 344
Difference between estimated fair value and unpaid principal balance (48) (45)
Carrying value at estimated fair value 276 299
Loans in nonaccrual status 79 89
Loans more than 90 days past due 34 41
Loans in nonaccrual status or more than 90 days past due, or both — difference between aggregate estimated fair value and unpaid principal balance $ (35) $ (36)