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Fair Value (Fair Value Option for Residential Mortgage Loans) (Details) - Residential mortgage loans - FVO - USD ($)
$ in Millions
Jun. 30, 2022
Dec. 31, 2021
Fair Value, Option, Quantitative Disclosures [Line Items]    
Unpaid principal balance $ 115 $ 130
Difference between estimated fair value and unpaid principal balance (6) (3)
Carrying value at estimated fair value 109 127
Loans in nonaccrual status 24 32
Loans more than 90 days past due 10 14
Loans in nonaccrual status or more than 90 days past due, or both — difference between aggregate estimated fair value and unpaid principal balance $ (2) $ (7)