Fair Value Measurements (Details 3) (USD $) In Millions, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013		Jun. 30, 2012
Liabilities of Managed Investment Entities [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Financial liabilities, Beginning Balance	$ (2,501)	[1]	$ (2,554)	[2]	$ (2,745)	[3]	$ (2,593)	[4]
Total realized/unrealized gains (losses) included in Net income	(14)	[1]	(19)	[2]	(39)	[3]	(103)	[4]
Purchases and issuances	(406)	[1]	0	[2]	(406)	[3]	(366)	[4]
Sales and Settlements	439	[1]	144	[2]	689	[3]	633	[4]
Transfer out of Level 3					19	[3]
Financial liabilities, Ending Balance	(2,482)	[1],[3]	(2,429)	[2],[4]	(2,482)	[1],[3]	(2,429)	[2],[4]
Embedded derivatives [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Financial liabilities, Beginning Balance	(555)		(437)		(465)		(361)
Total realized/unrealized gains (losses) included in Net income	3		3		(77)		(57)
Purchases and issuances	(32)		(16)		(49)		(37)
Sales and Settlements	7		6		14		11
Financial liabilities, Ending Balance	$ (577)		$ (444)		$ (577)		$ (444)

[1] Total realized/unrealized loss included in net income includes losses of $9 million related to liabilities outstanding as of June 30, 2013. See Note H — “Managed Investment Entities.”

[2] Total realized/unrealized loss included in net income includes losses of $14 million related to liabilities outstanding as of June 30, 2012. See Note H — “Managed Investment Entities.”

[3] Total realized/unrealized loss included in net income includes losses of $24 million related to liabilities outstanding as of June 30, 2013. See Note H — “Managed Investment Entities.”

[4] Total realized/unrealized loss included in net income includes losses of $51 million related to liabilities outstanding as of June 30, 2012. See Note H — “Managed Investment Entities.”