Fair Value Measurements (Details 4) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Equity Securities [Member] | Available-for-sale Securities [Member]
Roll Forward of Financial Instruments (Assets Netted Against Liabilities) Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)
Fair Value of Financial Instruments (Assets Netted Against Liabilities), Measured at Fair Value on a Recurring Basis, Beginning Balance	$ 93	$ 154
Total realized/unrealized gains (losses) included in net income	3	(10)
Total realized/unrealized gains (losses) included in OCI		(1)
Purchases	2	13
Sales	(9)
Transfers into Level 3
Transfers out of Level 3		(76)
Fair Value of Financial Instruments (Assets Netted Against Liabilities), Measured at Fair Value on a Recurring Basis, Ending Balance	89	80
Changes in unrealized gains (losses) included in net income related to financial instruments still held at March 31, 2011		(10)
Freestanding Derivatives [Member]
Roll Forward of Financial Instruments (Assets Netted Against Liabilities) Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)
Fair Value of Financial Instruments (Assets Netted Against Liabilities), Measured at Fair Value on a Recurring Basis, Beginning Balance	724	401
Total realized/unrealized gains (losses) included in net income	(336)	(194)
Total realized/unrealized gains (losses) included in OCI
Purchases	(18)	88
Settlements	16	(19)
Sales
Transfers into Level 3
Transfers out of Level 3	31
Fair Value of Financial Instruments (Assets Netted Against Liabilities), Measured at Fair Value on a Recurring Basis, Ending Balance	417	276
Changes in unrealized gains (losses) included in net income related to financial instruments still held at March 31, 2011	(335)	185
Freestanding Derivatives [Member] | Hedging Derivatives [Member] | International [Member]
Roll Forward of Financial Instruments (Assets Netted Against Liabilities) Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)
Fair Value of Financial Instruments (Assets Netted Against Liabilities), Measured at Fair Value on a Recurring Basis, Beginning Balance	35	5
Total realized/unrealized gains (losses) included in net income	85	(3)
Total realized/unrealized gains (losses) included in OCI
Purchases	(53)
Settlements	40
Sales
Transfers into Level 3
Transfers out of Level 3	8
Fair Value of Financial Instruments (Assets Netted Against Liabilities), Measured at Fair Value on a Recurring Basis, Ending Balance	115	2
Changes in unrealized gains (losses) included in net income related to financial instruments still held at March 31, 2011	85	(2)
Freestanding Derivatives [Member] | Hedging Derivatives [Member] | Guaranteed Minimum Withdrawal Benefit [Member] | U.S. [Member]
Roll Forward of Financial Instruments (Assets Netted Against Liabilities) Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)
Fair Value of Financial Instruments (Assets Netted Against Liabilities), Measured at Fair Value on a Recurring Basis, Beginning Balance	883	600
Total realized/unrealized gains (losses) included in net income	(312)	(119)
Total realized/unrealized gains (losses) included in OCI
Purchases		23
Settlements		(16)
Sales
Transfers into Level 3
Transfers out of Level 3	23
Fair Value of Financial Instruments (Assets Netted Against Liabilities), Measured at Fair Value on a Recurring Basis, Ending Balance	594	488
Changes in unrealized gains (losses) included in net income related to financial instruments still held at March 31, 2011	(312)	(113)
Freestanding Derivatives [Member] | US Macro Hedge Program [Member]
Roll Forward of Financial Instruments (Assets Netted Against Liabilities) Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)
Fair Value of Financial Instruments (Assets Netted Against Liabilities), Measured at Fair Value on a Recurring Basis, Beginning Balance	357	203
Total realized/unrealized gains (losses) included in net income	(184)	(80)
Total realized/unrealized gains (losses) included in OCI
Sales
Transfers into Level 3
Fair Value of Financial Instruments (Assets Netted Against Liabilities), Measured at Fair Value on a Recurring Basis, Ending Balance	173	123
Changes in unrealized gains (losses) included in net income related to financial instruments still held at March 31, 2011	(183)	(80)
Freestanding Derivatives [Member] | Credit derivative [Member]
Roll Forward of Financial Instruments (Assets Netted Against Liabilities) Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)
Fair Value of Financial Instruments (Assets Netted Against Liabilities), Measured at Fair Value on a Recurring Basis, Beginning Balance	(561)	(390)
Total realized/unrealized gains (losses) included in net income	92	11
Total realized/unrealized gains (losses) included in OCI
Purchases		1
Settlements	(5)	(4)
Sales
Transfers into Level 3
Fair Value of Financial Instruments (Assets Netted Against Liabilities), Measured at Fair Value on a Recurring Basis, Ending Balance	(474)	(382)
Changes in unrealized gains (losses) included in net income related to financial instruments still held at March 31, 2011	80	11
Freestanding Derivatives [Member] | Equity derivative [Member]
Roll Forward of Financial Instruments (Assets Netted Against Liabilities) Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)
Fair Value of Financial Instruments (Assets Netted Against Liabilities), Measured at Fair Value on a Recurring Basis, Beginning Balance	40	4
Total realized/unrealized gains (losses) included in net income	(17)	1
Total realized/unrealized gains (losses) included in OCI
Purchases	35
Settlements	(19)
Sales
Transfers into Level 3
Fair Value of Financial Instruments (Assets Netted Against Liabilities), Measured at Fair Value on a Recurring Basis, Ending Balance	39	5
Changes in unrealized gains (losses) included in net income related to financial instruments still held at March 31, 2011	(5)	1
Freestanding Derivatives [Member] | Interest rate derivatives [Member]
Roll Forward of Financial Instruments (Assets Netted Against Liabilities) Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)
Fair Value of Financial Instruments (Assets Netted Against Liabilities), Measured at Fair Value on a Recurring Basis, Beginning Balance	(58)	(53)
Total realized/unrealized gains (losses) included in net income	1	(3)
Total realized/unrealized gains (losses) included in OCI
Purchases		64
Settlements		1
Sales
Transfers into Level 3
Fair Value of Financial Instruments (Assets Netted Against Liabilities), Measured at Fair Value on a Recurring Basis, Ending Balance	(57)	9
Changes in unrealized gains (losses) included in net income related to financial instruments still held at March 31, 2011	1	(1)
Freestanding Derivatives [Member] | Other Derivatives Contracts [Member]
Roll Forward of Financial Instruments (Assets Netted Against Liabilities) Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)
Fair Value of Financial Instruments (Assets Netted Against Liabilities), Measured at Fair Value on a Recurring Basis, Beginning Balance	28	32
Total realized/unrealized gains (losses) included in net income	(1)	(1)
Total realized/unrealized gains (losses) included in OCI
Sales
Transfers into Level 3
Fair Value of Financial Instruments (Assets Netted Against Liabilities), Measured at Fair Value on a Recurring Basis, Ending Balance	27	31
Changes in unrealized gains (losses) included in net income related to financial instruments still held at March 31, 2011	$ (1)	$ (1)