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Investments (Schedule of Securities Pledged by Contractual Maturity) (Details) - USD ($)
$ in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase Agreements $ 533 $ 535
Securities Lending [1] 200 216
Total gross secured borrowings 733 751
Corporate bonds [Member]    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase Agreements 533 535
Securities Lending 200 212
Foreign government bonds [Member]    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities Lending   4
Overnight and Continuous [Member]    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities Lending 200 216
Total gross secured borrowings 200 216
Overnight and Continuous [Member] | Corporate bonds [Member]    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities Lending 200 212
Overnight and Continuous [Member] | Foreign government bonds [Member]    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Securities Lending   4
Up to 30 days [Member]    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase Agreements 100  
Total gross secured borrowings 100  
Up to 30 days [Member] | Corporate bonds [Member]    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase Agreements 100  
30 to 90 Days [Member]    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase Agreements 283 389
Total gross secured borrowings 283 389
30 to 90 Days [Member] | Corporate bonds [Member]    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase Agreements 283 389
Greater than 90 days [Member]    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase Agreements 150 146
Total gross secured borrowings 150 146
Greater than 90 days [Member] | Corporate bonds [Member]    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase Agreements $ 150 $ 146
[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.