Realized (Gain) Loss (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Details underlying realized gain (loss)
Total realized gain (loss) related to certain investments	$ (190)	$ (148)	$ (180)
Realized gain (loss) on the mark-to-market on certain instruments	133	(82)	75
Indexed annuity net derivative results
Gross gain (loss)	16	2	34
Associated amortization of DAC, VOBA, DSI, and DFEL	(5)	(2)	(14)
Variable annuity net derivatives results
Gross gain (loss)	164	(60)	56
Associated amortization of DAC, VOBA, DSI, and DFEL	(44)	(4)	(40)
Total realized gain (loss)	$ 74	$ (294)	$ (69)