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Investments (Schedule of Securities Pledged by Contractual Maturity) (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities Lending $ 228 $ 116
Total gross secured borrowings 228 116
Corporate Bonds [Member]    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities Lending 222 114
Equity Securities [Member]    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities Lending 2  
Foreign Government Bonds [Member]    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities Lending 4 2
Overnight and Continuous [Member]    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Total gross secured borrowings 228 116
Overnight and Continuous [Member] | Corporate Bonds [Member]    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities Lending 222 114
Overnight and Continuous [Member] | Equity Securities [Member]    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities Lending 2  
Overnight and Continuous [Member] | Foreign Government Bonds [Member]    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities Lending $ 4 $ 2