Investments (Schedule of Securities Pledged by Contractual Maturity) (Details) - USD ($) $ in Millions		Jun. 30, 2015	Dec. 31, 2014
Repurchase Agreements and Repurchase-to-Maturity	[1]	$ 1,034	$ 607
Securities Lending Transactions	[2]	232	$ 204
Total borrowings		1,266
Gross amount of recognized liabilities for repurchase		$ 1,266
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		534
Securities Lending Transactions		224
Equity AFS Securities [Member]
Securities Lending Transactions		3
Foreign Government Bonds [Member]
Securities Lending Transactions		5
Overnight and Continuous [Member]
Securities Lending Transactions		232
Total borrowings		232
Overnight and Continuous [Member] | Corporate Bonds [Member]
Securities Lending Transactions		224
Overnight and Continuous [Member] | Equity AFS Securities [Member]
Securities Lending Transactions		3
Overnight and Continuous [Member] | Foreign Government Bonds [Member]
Securities Lending Transactions		5
Up to 30 days [Member]
Repurchase Agreements and Repurchase-to-Maturity		105
Total borrowings		105
Up to 30 days [Member] | Corporate Bonds [Member]
Repurchase Agreements and Repurchase-to-Maturity		105
30 to 90 Days [Member]
Repurchase Agreements and Repurchase-to-Maturity		275
Total borrowings		275
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		654
Total borrowings		654
Greater than 90 days [Member] | ABS [Member]
Repurchase Agreements and Repurchase-to-Maturity		500
Greater than 90 days [Member] | Corporate Bonds [Member]
Repurchase Agreements and Repurchase-to-Maturity		$ 154

[1] (3) 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.