Investments (Schedule of Securities Pledged by Contractual Maturity) (Details) - USD ($) $ in Millions		9 Months Ended	12 Months Ended
		Sep. 30, 2016	Dec. 31, 2015
Repurchase Agreements		$ 783	$ 673
Securities Lending	[1]	239	242
Total gross secured borrowings		1,022	915
Corporate bonds [Member]
Repurchase Agreements		533	423
Securities Lending		239	242
RMBS [Member]
Repurchase Agreements		250	250
Overnight and Continuous [Member]
Securities Lending		239	242
Total gross secured borrowings		239	242
Overnight and Continuous [Member] | Corporate bonds [Member]
Securities Lending		239	242
Up to 30 days [Member]
Repurchase Agreements		250
Total gross secured borrowings		250
Up to 30 days [Member] | RMBS [Member]
Repurchase Agreements		250
30 to 90 Days [Member]
Repurchase Agreements		385	275
Total gross secured borrowings		385	275
30 to 90 Days [Member] | Corporate bonds [Member]
Repurchase Agreements		385	275
Greater than 90 days [Member]
Repurchase Agreements		148	398
Total gross secured borrowings		148	398
Greater than 90 days [Member] | Corporate bonds [Member]
Repurchase Agreements		$ 148	148
Greater than 90 days [Member] | RMBS [Member]
Repurchase Agreements			$ 250

[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.