Investments - (Details - RCG Gains/Losses & Impairments) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Impairments Table Details [Abstract]
Credit-related	$ (20)	[1]	$ (28)	[1]	$ (38)	[1]
Other	(2)		(25)		(1)
Total	(22)		(53)		(39)
Realized Investment Gains And Losses Table Details [Abstract]
Total realized investment gains (losses)	$ 44		$ 62		$ 75

[1] Credit-related losses include other-than-temporary declines in fair value of fixed maturities and equity securities and changes in valuation reserves and asset write-downs related to commercial mortgage loans and investments in real estate entities. There were no credit losses on fixed maturities for which a portion of the impairment was recognized in other comprehensive income.