Derivative Financial Instruments (Details 12) (USD $) In Millions	Sep. 30, 2011	Dec. 31, 2010
Embedded Derivative, Fair Value of Embedded Derivative, Net [Abstract]
Embedded Derivative, Fair Value of Embedded Derivative Asset	$ 3	$ 128
Embedded Derivative, Fair Value of Embedded Derivative Liability	4,881	2,634
Options embedded in debt or equity securities [Member]
Embedded Derivative, Fair Value of Embedded Derivative, Net [Abstract]
Embedded Derivative, Fair Value of Embedded Derivative Asset	(62)	(57)
Ceded Guaranteed Minimum Benefit [Member]
Embedded Derivative, Fair Value of Embedded Derivative, Net [Abstract]
Embedded Derivative, Fair Value of Embedded Derivative Asset	353	185
Direct Guaranteed Minimum Benefit [Member]
Embedded Derivative, Fair Value of Embedded Derivative, Net [Abstract]
Embedded Derivative, Fair Value of Embedded Derivative Liability	2,683	370
Assumed Guaranteed Minimum Benefit [Member]
Embedded Derivative, Fair Value of Embedded Derivative, Net [Abstract]
Embedded Derivative, Fair Value of Embedded Derivative Liability	2,119	2,186
Other [Member]
Embedded Derivative, Fair Value of Embedded Derivative, Net [Abstract]
Embedded Derivative, Fair Value of Embedded Derivative Asset	3	0
Embedded Derivative, Fair Value of Embedded Derivative Liability	$ 79	$ 78