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Investments (Schedule of Securities Pledged by Contractual Maturity) (Details) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities Lending [1] $ 156 $ 88
Total gross secured borrowings 312 238
Corporate Bonds [Member]    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase Agreements 156 150
Securities Lending 156 88
Overnight and Continuous [Member]    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Total gross secured borrowings 156 88
Overnight and Continuous [Member] | Corporate Bonds [Member]    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities Lending 156 88
Greater than 90 days [Member]    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Total gross secured borrowings 156 150
Greater than 90 days [Member] | Corporate Bonds [Member]    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase Agreements $ 156 $ 150
[1] Our pledged securities under securities lending agreements are included in fixed maturity AFS securities on our Consolidated Balance Sheets. We generally obtain collateral in an amount equal to 102% and 105% of the fair value of the domestic and foreign securities, respectively. We value collateral daily and obtain additional collateral when deemed appropriate. The cash received in our securities lending program is typically invested in cash and invested cash or fixed maturity AFS securities.