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Investments (Purchased Financial Assets with Credit Deterioration) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]      
ACL at Acquisition $ (3) $ (18) $ 0
Residential Mortgage Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Contractual Principal 514    
ACL at Acquisition (3) $ (18) $ 0
Non-Credit (Discount) Premium 32    
Purchase Price $ 543