Fair Value Measurements (Details 3) (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2012		Sep. 30, 2011		Sep. 30, 2012		Sep. 30, 2011
Liabilities of Managed Investment Entities [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Financial liabilities, Beginning Balance	$ (2,429)	[1]	$ (2,322)	[2]	$ (2,593)	[3]	$ (2,258)	[4]
Total realized/unrealized gains (losses) included in Net income	(52)	[1]	89	[2]	(155)	[3]	17	[4]
Purchases and issuances	(97)	[1]			(463)	[3]
Sales and Settlements	72	[1]	51	[2]	705	[3]	59	[4]
Financial liabilities, Ending Balance	(2,506)	[1],[3]	(2,182)	[2],[4]	(2,506)	[1],[3]	(2,182)	[2],[4]
Embedded derivatives [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Financial liabilities, Beginning Balance	(444)		(279)		(361)		(181)
Total realized/unrealized gains (losses) included in Net income	(41)		32		(97)		4
Purchases and issuances	(19)		(62)		(57)		(142)
Sales and Settlements	7		4		18		14
Financial liabilities, Ending Balance	$ (497)		$ (305)		$ (497)		$ (305)

[1] Total realized/unrealized loss included in net income includes losses of $49 million related to liabilities outstanding as of September 30, 2012. See Note H — “Managed Investment Entities.”

[2] Total realized/unrealized loss included in net income includes losses of $89 million related to liabilities outstanding as of September 30, 2011. See Note H — “Managed Investment Entities.”

[3] Total realized/unrealized loss included in net income includes losses of $99 million related to liabilities outstanding as of September 30, 2012. See Note H — “Managed Investment Entities.”

[4] Total realized/unrealized loss included in net income includes losses of $19 million related to liabilities outstanding as of September 30, 2011. See Note H — “Managed Investment Entities.”