Fair Value Measurements (Details 3) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Liabilities of Managed Investment Entities [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Financial liabilities, Beginning Balance	$ (2,593)	[1],[2]	$ (2,258)	[1],[3]	$ 0	[3]
Consolidate Managed Investment Entities					(2,084)	[3]
Total realized/unrealized gains (losses) included in Net income	(189)	[2]	0	[1]	(220)	[3]
Purchases and issuances	(793)	[2]	(401)	[1]
Sales and settlements	830	[2]	66	[1]
Purchases, sales, issuances and settlements					46	[3]
Financial liabilities, Ending Balance	(2,745)	[2]	(2,593)	[1],[2]	(2,258)	[1],[3]
Embedded derivatives [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Financial liabilities, Beginning Balance	(361)		(181)		(113)
Consolidate Managed Investment Entities					0
Total realized/unrealized gains (losses) included in Net income	(57)		(29)		(23)
Purchases and issuances	(73)		(171)
Sales and settlements	26		20
Purchases, sales, issuances and settlements					(45)
Financial liabilities, Ending Balance	$ (465)		$ (361)		$ (181)

[1] Total realized/unrealized loss included in net income includes losses of $3 million related to liabilities outstanding as of December 31, 2011. See Note H — “Managed Investment Entities.”

[2] Total realized/unrealized loss included in net income includes losses of $125 million related to liabilities outstanding as of December 31, 2012. See Note H — “Managed Investment Entities.”

[3] Total realized/unrealized loss included in net income includes losses of $213 million related to liabilities outstanding as of December 31, 2010. See Note H — “Managed Investment Entities.”