Investments (Schedule of Securities Pledged by Contractual Maturity) (Details) - USD ($) $ in Millions		Sep. 30, 2015	Dec. 31, 2014
Repurchase Agreements and Repurchase-to-Maturity	[1]	$ 926	$ 607
Securities Lending Transactions	[2]	229	$ 204
Total borrowings		1,155
Gross amount of recognized liabilities for repurchase		$ 1,155
Amounts related to agreements not included in offsetting
ABS [Member]
Repurchase Agreements and Repurchase-to-Maturity		$ 500
Corporate Bonds [Member]
Repurchase Agreements and Repurchase-to-Maturity		426
Securities Lending Transactions		227
Foreign Government Bonds [Member]
Securities Lending Transactions		2
Overnight and Continuous [Member]
Securities Lending Transactions		229
Total borrowings		229
Overnight and Continuous [Member] | Corporate Bonds [Member]
Securities Lending Transactions		227
Overnight and Continuous [Member] | Foreign Government Bonds [Member]
Securities Lending Transactions		2
30 to 90 Days [Member]
Repurchase Agreements and Repurchase-to-Maturity		775
Total borrowings		775
30 to 90 Days [Member] | ABS [Member]
Repurchase Agreements and Repurchase-to-Maturity		500
30 to 90 Days [Member] | Corporate Bonds [Member]
Repurchase Agreements and Repurchase-to-Maturity		275
Greater than 90 days [Member]
Repurchase Agreements and Repurchase-to-Maturity		151
Total borrowings		151
Greater than 90 days [Member] | Corporate Bonds [Member]
Repurchase Agreements and Repurchase-to-Maturity		$ 151

[1] Our pledged securities under repurchase agreements are included in fixed maturity AFS securities on our Consolidated Balance Sheets. We obtain collateral in an amount equal to 95% of the fair value of the securities, and our agreements with third parties contain contractual provisions to allow for additional collateral to be obtained when necessary. The cash received in our repurchase program is typically invested in fixed maturity AFS securities.

[2] 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.