Derivative Financial Instruments (Details 9) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	$ (293)	$ (27)
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Net Derivative Gain (Losses) [Member]
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	(3,823)	(1,235)
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Net Investment Gains (Losses) [Member]
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	(2)	(26)
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Policyholder Benefit and Claim [Member]
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	(263)	(102)
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Other Revenues [Member]
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	(114)	(65)
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Other Expenses [Member]
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	0	0
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Interest rate swaps [Member] | Net Derivative Gain (Losses) [Member]
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	(799)	(270)
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Interest rate swaps [Member] | Net Investment Gains (Losses) [Member]
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	0	(1)
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Interest rate swaps [Member] | Policyholder Benefit and Claim [Member]
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	0	0
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Interest rate swaps [Member] | Other Revenues [Member]
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	(48)	(48)
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Interest rate swaps [Member] | Other Expenses [Member]
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	0	0
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Interest rate floors [Member] | Net Derivative Gain (Losses) [Member]
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	(180)	(125)
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Interest rate floors [Member] | Net Investment Gains (Losses) [Member]
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	0	0
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Interest rate floors [Member] | Policyholder Benefit and Claim [Member]
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	0	0
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Interest rate floors [Member] | Other Revenues [Member]
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	0	0
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Interest rate floors [Member] | Other Expenses [Member]
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	0	0
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Interest rate caps [Member] | Net Derivative Gain (Losses) [Member]
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	(11)	(9)
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Interest rate caps [Member] | Net Investment Gains (Losses) [Member]
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	0	0
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Interest rate caps [Member] | Policyholder Benefit and Claim [Member]
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	0	0
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Interest rate caps [Member] | Other Revenues [Member]
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	0	0
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Interest rate caps [Member] | Other Expenses [Member]
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	0	0
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Interest rate futures [Member] | Net Derivative Gain (Losses) [Member]
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	(121)	(2)
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Interest rate futures [Member] | Net Investment Gains (Losses) [Member]
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	0	1
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Interest rate futures [Member] | Policyholder Benefit and Claim [Member]
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	0	0
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Interest rate futures [Member] | Other Revenues [Member]
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	0	0
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Interest rate futures [Member] | Other Expenses [Member]
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	0	0
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Equity futures [Member] | Net Derivative Gain (Losses) [Member]
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	(646)	54
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Equity futures [Member] | Net Investment Gains (Losses) [Member]
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	9	(7)
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Equity futures [Member] | Policyholder Benefit and Claim [Member]
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	(248)	(102)
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Equity futures [Member] | Other Revenues [Member]
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	0	0
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Equity futures [Member] | Other Expenses [Member]
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	0	0
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Foreign currency swaps [Member] | Net Derivative Gain (Losses) [Member]
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	(83)	(121)
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Foreign currency swaps [Member] | Net Investment Gains (Losses) [Member]
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	0	0
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Foreign currency swaps [Member] | Policyholder Benefit and Claim [Member]
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	0	0
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Foreign currency swaps [Member] | Other Revenues [Member]
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	0	0
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Foreign currency swaps [Member] | Other Expenses [Member]
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	0	0
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Foreign currency forwards [Member] | Net Derivative Gain (Losses) [Member]
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	(240)	(169)
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Foreign currency forwards [Member] | Net Investment Gains (Losses) [Member]
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	0	(9)
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Foreign currency forwards [Member] | Policyholder Benefit and Claim [Member]
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	0	0
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Foreign currency forwards [Member] | Other Revenues [Member]
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	0	0
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Foreign currency forwards [Member] | Other Expenses [Member]
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	0	0
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Currency futures [Member] | Net Derivative Gain (Losses) [Member]
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	(29)	9
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Currency futures [Member] | Net Investment Gains (Losses) [Member]
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	0	0
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Currency futures [Member] | Policyholder Benefit and Claim [Member]
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	0	0
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Currency futures [Member] | Other Revenues [Member]
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	0	0
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Currency futures [Member] | Other Expenses [Member]
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	0	0
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Currency options [Member] | Net Derivative Gain (Losses) [Member]
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	10	(32)
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Currency options [Member] | Net Investment Gains (Losses) [Member]
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	0	0
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Currency options [Member] | Policyholder Benefit and Claim [Member]
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	0	0
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Currency options [Member] | Other Revenues [Member]
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	0	0
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Currency options [Member] | Other Expenses [Member]
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	0	0
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Equity Options [Member] | Net Derivative Gain (Losses) [Member]
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	(942)	(419)
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Equity Options [Member] | Net Investment Gains (Losses) [Member]
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	(2)	(7)
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Equity Options [Member] | Policyholder Benefit and Claim [Member]
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	(31)	0
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Equity Options [Member] | Other Revenues [Member]
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	0	0
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Equity Options [Member] | Other Expenses [Member]
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	0	0
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Interest rate options [Member] | Net Derivative Gain (Losses) [Member]
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	(358)	(27)
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Interest rate options [Member] | Net Investment Gains (Losses) [Member]
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	0	0
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Interest rate options [Member] | Policyholder Benefit and Claim [Member]
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	0	0
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Interest rate options [Member] | Other Revenues [Member]
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	0	(9)
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Interest rate options [Member] | Other Expenses [Member]
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	0	0
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Interest rate forwards [Member] | Net Derivative Gain (Losses) [Member]
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	10	0
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Interest rate forwards [Member] | Net Investment Gains (Losses) [Member]
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	0	0
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Interest rate forwards [Member] | Policyholder Benefit and Claim [Member]
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	0	0
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Interest rate forwards [Member] | Other Revenues [Member]
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	(66)	(8)
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Interest rate forwards [Member] | Other Expenses [Member]
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	0	0
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Variance swaps [Member] | Net Derivative Gain (Losses) [Member]
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	(336)	(77)
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Variance swaps [Member] | Net Investment Gains (Losses) [Member]
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	0	(3)
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Variance swaps [Member] | Policyholder Benefit and Claim [Member]
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	16	0
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Variance swaps [Member] | Other Revenues [Member]
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	0	0
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Variance swaps [Member] | Other Expenses [Member]
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	0	0
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Credit default swaps [Member] | Net Derivative Gain (Losses) [Member]
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	(84)	(45)
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Credit default swaps [Member] | Net Investment Gains (Losses) [Member]
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	(9)	0
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Credit default swaps [Member] | Policyholder Benefit and Claim [Member]
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	0	0
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Credit default swaps [Member] | Other Revenues [Member]
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	0	0
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Credit default swaps [Member] | Other Expenses [Member]
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	0	0
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Total rate of return swaps [Member] | Net Derivative Gain (Losses) [Member]
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	(14)	(2)
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Total rate of return swaps [Member] | Net Investment Gains (Losses) [Member]
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	0	0
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Total rate of return swaps [Member] | Policyholder Benefit and Claim [Member]
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	0	0
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Total rate of return swaps [Member] | Other Revenues [Member]
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	0	0
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Total rate of return swaps [Member] | Other Expenses [Member]
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	$ 0	$ 0