Investments and Derivative Instruments (Details 12) (USD $) In Millions	Jun. 30, 2011	Dec. 31, 2010
Derivative [Line Items]
Notional Amount	$ 126,446	$ 136,854
Fair Value	(404)	(547)
Customized swaps [Member] | GMWB hedging instruments [Member]
Derivative [Line Items]
Notional Amount	9,615	10,113
Fair Value	175	209
Equity swaps, options and futures [Member] | GMWB hedging instruments [Member]
Derivative [Line Items]
Notional Amount	5,239	4,943
Fair Value	372	391
Interest rate swaps and futures [Member] | GMWB hedging instruments [Member]
Derivative [Line Items]
Notional Amount	2,752	2,800
Fair Value	(118)	(133)
GMWB hedging instruments [Member]
Derivative [Line Items]
Notional Amount	17,606	17,856
Fair Value	$ 429	$ 467