Derivative Financial Instruments (Details 9) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	$ 321	$ 299	$ 28	$ 272
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	3,253	660	(570)	(575)
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	(13)	4	(15)	(22)
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	50	(6)	(213)	(108)
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	119	43	5	(22)
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	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	1,288	644	489	374
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)	0	(2)
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	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	129	72	81	24
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	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	219	107	39	(18)
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	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	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	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	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	(51)	(73)	(62)	(82)
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	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	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	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	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	242	(47)	121	(49)
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	0	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	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	(2)	(4)	(2)	(4)
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	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	135	1	(511)	55
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)	10	0	3
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	42	(6)	(206)	(108)
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	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	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	106	(71)	23	(192)
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	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	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	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	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	210	29	(30)	(140)
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	0	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	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	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	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	18	0	(11)	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	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	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	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	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	(14)	(13)	(4)	(45)
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	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	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	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	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	555	52	(387)	(367)
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	(6)	(4)	(8)	(11)
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	12	0	(19)	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	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	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	471	13	113	(14)
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	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	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	6	0	(3)
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	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	8	0	18	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	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	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	(8)	(31)	(74)	(39)
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	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	77	(14)	(259)	(91)
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	0	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	(4)	0	12	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	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	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	(36)	31	(120)	(14)
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	2	(1)	(7)	(1)
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	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	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	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	25	1	11	(1)
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	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	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	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	$ 0	$ 0