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Fair Value (Fair Value Option for Residential Mortgage Loans) (Details) - Residential mortgage loans - FVO - USD ($)
$ in Millions
Sep. 30, 2022
Dec. 31, 2021
Fair Value, Option, Quantitative Disclosures [Line Items]    
Unpaid principal balance $ 0 $ 130
Difference between estimated fair value and unpaid principal balance 0 (3)
Carrying value at estimated fair value 0 127
Loans in nonaccrual status 0 32
Loans more than 90 days past due 0 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)