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Fair Value (Fair Value Option for Residential Mortgage Loans) (Details) - Residential mortgage loans - FVO - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Fair Value, Option, Quantitative Disclosures [Line Items]    
Unpaid principal balance $ 119 $ 130
Difference between estimated fair value and unpaid principal balance 0 (3)
Carrying value at estimated fair value 119 127
Loans in nonaccrual status 27 32
Loans more than 90 days past due 13 14
Loans in nonaccrual status or more than 90 days past due, or both — difference between aggregate estimated fair value and unpaid principal balance $ 0 $ (7)