Variable Interest Entities (Changes in Level 3 Assets and Liabilities) (Details 2) - Consolidated investment entities [Member] - USD ($)		3 Months Ended				9 Months Ended
		Sep. 30, 2015		Sep. 30, 2014		Sep. 30, 2015		Sep. 30, 2014
Changes in Level 3 assets and liabilities measured at fair value on a recurring basis
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount		$ 0		$ 0		$ 0		$ 0
Corporate debt securities [Member]
Summary of changes in Level 3 assets measured at fair value on a recurring basis [Rollforward]
Balance, at the beginning of the period				0				2,000,000
Total gains (losses) included in net income	[1]							1,000,000
Purchases								2,000,000
Sales								(9,000,000)
Transfers into Level 3								10,000,000
Transfers out of Level 3				0				(6,000,000)
Common stocks [Member]
Summary of changes in Level 3 assets measured at fair value on a recurring basis [Rollforward]
Balance, at the beginning of the period		11,000,000		7,000,000		7,000,000		14,000,000
Total gains (losses) included in net income	[1]					(1,000,000)		2,000,000
Sales								(2,000,000)
Transfers into Level 3				1,000,000		5,000,000		12,000,000
Transfers out of Level 3		(5,000,000)		(1,000,000)		(5,000,000)		(19,000,000)
Balance, at the end of the period		6,000,000		7,000,000		6,000,000		7,000,000
Changes in unrealized gains/ (losses) included in income relating to assets held at end of period	[1]							1,000,000
Syndicated loans [Member]
Summary of changes in Level 3 assets measured at fair value on a recurring basis [Rollforward]
Balance, at the beginning of the period		457,000,000		427,000,000		484,000,000		368,000,000
Total gains (losses) included in net income		(8,000,000)	[2]	(1,000,000)	[1]	(8,000,000)	[1]	5,000,000	[1]
Purchases		101,000,000		41,000,000		257,000,000		280,000,000
Sales		(5,000,000)		(14,000,000)		(23,000,000)		(42,000,000)
Settlements		(32,000,000)		(38,000,000)		(105,000,000)		(76,000,000)
Transfers into Level 3		136,000,000		84,000,000		523,000,000		328,000,000
Transfers out of Level 3		(195,000,000)		(185,000,000)		(674,000,000)		(549,000,000)
Balance, at the end of the period		454,000,000		314,000,000		454,000,000		314,000,000
Changes in unrealized gains/ (losses) included in income relating to assets held at end of period		(9,000,000)	[3]	(1,000,000)	[1]	(11,000,000)	[1]	1,000,000	[1]
Other assets [Member]
Summary of changes in Level 3 assets measured at fair value on a recurring basis [Rollforward]
Balance, at the beginning of the period		1,979,000,000		2,389,000,000		1,935,000,000		1,936,000,000
Total gains (losses) included in net income		24,000,000	[3]	144,000,000	[4]	122,000,000	[4]	330,000,000	[4]
Total gains (losses) included in other comprehensive loss		(61,000,000)		(151,000,000)		(54,000,000)		(84,000,000)
Purchases		193,000,000		23,000,000		539,000,000		282,000,000
Sales		(6,000,000)		(388,000,000)		(413,000,000)		(458,000,000)
Transfers into Level 3								11,000,000
Balance, at the end of the period		2,129,000,000		2,017,000,000		2,129,000,000		2,017,000,000
Changes in unrealized gains/ (losses) included in income relating to assets held at end of period		26,000,000	[3]	95,000,000	[4]	26,000,000	[1]	280,000,000	[4]
Debt [Member]
Summary of changes in Level 3 liabilities measured at fair value on a recurring basis [Rollforward]
Balance, at the beginning of the period		(6,487,000,000)		(5,511,000,000)		(6,030,000,000)		(4,804,000,000)
Total gains (losses) included in net income		67,000,000	[2]	(7,000,000)	[1]	96,000,000	[1]	(32,000,000)	[1]
Issues		(699,000,000)				(1,268,000,000)		(1,064,000,000)
Settlements		143,000,000		52,000,000		226,000,000		434,000,000
Balance, at the end of the period		(6,976,000,000)		(5,466,000,000)		(6,976,000,000)		(5,466,000,000)
Changes in unrealized gains/ (losses) included in income relating to liabilities held at end of period		$ 67,000,000	[2]	$ (7,000,000)	[1]	$ 96,000,000	[1]	$ 3,000,000	[1]

[1] Included in net investment income in the Consolidated Statements of Operations.

[2] Included in net investment income in the Consolidated Statements of Operations.

[3] Included in other revenues in the Consolidated Statements of Operations.

[4] Included in other revenues in the Consolidated Statements of Operations.