Derivative Financial Instruments (Details 5) (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Derivative Instruments, Gain (Loss) [Line Items]
Net Derivatives Gains (Losses) Recognized for Derivatives	$ 711	$ 609	$ 983	$ 698
Net Derivatives Gains (Losses) Recognized for Hedged Items	(734)	(598)	(1,004)	(700)
Ineffectiveness Recognized in Net Derivatives Gains (Losses)	(23)	11	(21)	(2)
Interest rate swaps [Member] | Fixed maturity securities [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net Derivatives Gains (Losses) Recognized for Derivatives	(26)	(13)	(31)	(38)
Net Derivatives Gains (Losses) Recognized for Hedged Items	22	13	27	38
Ineffectiveness Recognized in Net Derivatives Gains (Losses)	(4)	0	(4)	0
Interest rate swaps [Member] | Policyholder account balances [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net Derivatives Gains (Losses) Recognized for Derivatives	957	212	1,000	678
Net Derivatives Gains (Losses) Recognized for Hedged Items	(944)	(221)	(978)	(675)
Ineffectiveness Recognized in Net Derivatives Gains (Losses)	13	(9)	22	3
Foreign currency swaps [Member] | Foreign-denominated fixed maturity securities
Derivative Instruments, Gain (Loss) [Line Items]
Net Derivatives Gains (Losses) Recognized for Derivatives	1	(5)	0	11
Net Derivatives Gains (Losses) Recognized for Hedged Items	(1)	5	0	(12)
Ineffectiveness Recognized in Net Derivatives Gains (Losses)	0	0	0	(1)
Foreign currency swaps [Member] | Foreign-denominated policyholder account balances [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net Derivatives Gains (Losses) Recognized for Derivatives	(221)	415	14	47
Net Derivatives Gains (Losses) Recognized for Hedged Items	189	(395)	(53)	(51)
Ineffectiveness Recognized in Net Derivatives Gains (Losses)	$ (32)	$ 20	$ (39)	$ (4)