Derivatives (Gains Losses Recognized in Income Not Designated or Qualifying) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	$ (280)	$ (293)
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Net Derivative Gains (Losses) [Member]
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	(2,211)	(3,823)
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Net Derivative Gains (Losses) [Member] | Interest rate [Member]
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	(233)	(1,459)
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Net Derivative Gains (Losses) [Member] | Foreign currency [Member]
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	(451)	(342)
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Net Derivative Gains (Losses) [Member] | Credit derivatives - purchased [Member]
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	(6)	(188)
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Net Derivative Gains (Losses) [Member] | Credit derivatives - written [Member]
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	32	104
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Net Derivative Gains (Losses) [Member] | Equity market [Member]
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	(1,553)	(1,938)
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	(10)	(2)
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Net Investment Gains (Losses) [Member] | Interest rate [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] | Net Investment Gains (Losses) [Member] | Foreign currency [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] | Net Investment Gains (Losses) [Member] | Credit derivatives - purchased [Member]
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	(3)	(9)
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Net Investment Gains (Losses) [Member] | Credit derivatives - written [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] | Net Investment Gains (Losses) [Member] | Equity market [Member]
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	(7)	7
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Policyholder Benefits and Claims [Member]
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	(272)	(263)
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Policyholder Benefits and Claims [Member] | Interest rate [Member]
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	2	0
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Policyholder Benefits and Claims [Member] | Foreign currency [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] | Policyholder Benefits and Claims [Member] | Credit derivatives - purchased [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] | Policyholder Benefits and Claims [Member] | Credit derivatives - written [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] | Policyholder Benefits and Claims [Member] | Equity market [Member]
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	(274)	(263)
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	0	(114)
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Other Revenues [Member] | Interest rate [Member]
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	0	(114)
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Other Revenues [Member] | Foreign currency [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] | Other Revenues [Member] | Credit derivatives - purchased [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] | Other Revenues [Member] | Credit derivatives - written [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] | Other Revenues [Member] | Equity market [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] | 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] | Other Expenses [Member] | Interest rate [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] | Other Expenses [Member] | Foreign currency [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] | Other Expenses [Member] | Credit derivatives - purchased [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] | Other Expenses [Member] | Credit derivatives - written [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] | Other Expenses [Member] | Equity market [Member]
Gains/(losses) for derivatives not Designated as hedging instrument
Net Derivatives Gains (Losses) Recognized for Derivatives	$ 0	$ 0