Variable Interest Entities ("VIE's") (Consolidated Variable Interest Entity Asset and Liability Information) (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013 item		Dec. 31, 2012 item
Assets
Disclosure Of Variable Interest Entities Assets And Liabilities [Line Items]
Number of Instruments	1	[1]	1	[1]
Notional Amounts	$ 100	[1]	$ 100	[1]
Carrying Value	698	[1]	708	[1]
Assets | Fixed maturity corporate asset-backed credit card loan securities
Disclosure Of Variable Interest Entities Assets And Liabilities [Line Items]
Number of Instruments
Notional Amounts
Carrying Value	593		598
Assets | U.S. Government Bonds [Member]
Disclosure Of Variable Interest Entities Assets And Liabilities [Line Items]
Number of Instruments
Notional Amounts
Carrying Value	105		110
Assets | Excess mortality swap [Member]
Disclosure Of Variable Interest Entities Assets And Liabilities [Line Items]
Number of Instruments	1		1
Notional Amounts	100		100
Carrying Value
Liabilities | Credit Default Swaps [Member] | Derivative Instruments Not Designated And Not Qualifying As Hedging Instruments [Member]
Disclosure Of Variable Interest Entities Assets And Liabilities [Line Items]
Number of Instruments	2		2
Notional Amounts	600		600
Carrying Value	101		128
Liabilities | Contingent Forwards [Member] | Derivative Instruments Not Designated And Not Qualifying As Hedging Instruments [Member]
Disclosure Of Variable Interest Entities Assets And Liabilities [Line Items]
Number of Instruments	2		2
Notional Amounts
Carrying Value
Liabilities | Derivative Instruments Not Designated And Not Qualifying As Hedging Instruments [Member]
Disclosure Of Variable Interest Entities Assets And Liabilities [Line Items]
Number of Instruments	4		4
Notional Amounts	600		600
Carrying Value	$ 101		$ 128

[1] Reported in variable interest entities’ fixed maturity securities on our Consolidated Balance Sheets.