Realized (Gain) Loss (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Details underlying realized gain (loss)
Total realized gain (loss) related to certain investments	$ (48)	$ (15)
Realized gain (loss) on the mark-to-market on certain instruments	58	10
Indexed annuity net derivative results
Gross gain (loss)	22	6
Associated amortization of DAC, VOBA, DSI, and DFEL	(6)	(2)
Variable annuity net derivatives results
Gross gain (loss)	(133)	10
Associated amortization of DAC, VOBA, DSI, and DFEL	22	(7)
Total realized gain (loss)	$ (85)	$ 2