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Investments (Purchased Financial Assets with Credit Deterioration) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]      
ACL at Acquisition $ (18) $ 0 $ 0
Residential Mortgage Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Contractual Principal 593    
ACL at Acquisition (18) $ 0 $ 0
Non-Credit (Discount) Premium (13)    
Purchase Price $ 562