Derivative Financial Instruments (Details 9) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	$ 26	$ 711	$ 54	$ 983
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	(1,087)	6,172	(1,657)	5,597
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	(4)	8	(19)	(14)
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	(186)	319	(399)	211
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	30	294	35	272
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	(182)	1,805	307	2,179
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	0	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	31	321	112	345
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	11	521	50	503
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	(37)	(127)	(99)	(209)
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	40	43	161	(6)
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	(1)	(5)	(3)	(9)
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	(196)	338	(707)	393
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	7	(12)	7	(9)
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	(167)	314	(373)	206
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	(118)	272	(95)	80
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	(32)	406	(62)	266
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	6	28	(5)	37
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	(1)	(18)	(5)	(63)
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	(325)	1,432	(712)	1,065
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	(5)	5	(13)	(6)
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	(30)	0	(49)	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	(80)	962	33	948
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	27	0	24
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	(3)	(5)	15	(5)
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	0	(49)	(74)	(88)
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	(148)	325	(407)	234
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	11	0	23	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	(12)	163	(132)	149
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	(6)	15	(13)	14
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	(10)	27	1	26
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	5	0	5
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