Fair Value Measurements (Details 3) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Liabilities of Managed Investment Entities [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Financial liabilities, Beginning Balance	$ (2,745)	[1]	$ (2,593)	[2]
Total realized/unrealized gains (losses) included in Net income	(25)	[1]	(84)	[2]
Purchases and issuances	0	[1]	(366)	[2]
Sales and Settlements	250	[1]	489	[2]
Financial liabilities, Ending Balance	(2,501)	[1]	(2,554)	[2]
Embedded derivatives [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Financial liabilities, Beginning Balance	(465)		(361)
Total realized/unrealized gains (losses) included in Net income	(80)		(60)
Purchases and issuances	(17)		(21)
Sales and Settlements	7		5
Financial liabilities, Ending Balance	$ (555)		$ (437)

[1] Total realized/unrealized loss included in net income includes losses of $18 million related to liabilities outstanding as of March 31, 2013. See Note H — “Managed Investment Entities.”

[2] Total realized/unrealized loss included in net income includes losses of $39 million related to liabilities outstanding as of March 31, 2012. See Note H — “Managed Investment Entities.”