Variable Interest Entities (Changes in Level 3 Assets and Liabilities) (Details 2) - Consolidated investment entities [Member] - USD ($)		3 Months Ended				6 Months Ended
		Jun. 30, 2015		Jun. 30, 2014		Jun. 30, 2015		Jun. 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				13,000,000				2,000,000
Total gains (losses) included in net income	[1]							1,000,000
Purchases								2,000,000
Sales				(7,000,000)				(9,000,000)
Transfers into Level 3								10,000,000
Transfers out of Level 3				(6,000,000)				(6,000,000)
Changes in unrealized gains/ (losses) included in income relating to assets held at end of period	[1]							0
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		10,000,000		7,000,000		14,000,000
Total gains (losses) included in net income	[1]					(1,000,000)		2,000,000
Sales				(2,000,000)				(2,000,000)
Transfers into Level 3				5,000,000		5,000,000		11,000,000
Transfers out of Level 3				(6,000,000)				(18,000,000)
Balance, at the end of the period		11,000,000		7,000,000		11,000,000		7,000,000
Changes in unrealized gains/ (losses) included in income relating to assets held at end of period	[1]					(1,000,000)		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		467,000,000		384,000,000		484,000,000		368,000,000
Total gains (losses) included in net income		1,000,000	[2]	2,000,000	[1]			6,000,000	[1]
Purchases		119,000,000		142,000,000		156,000,000		238,000,000
Sales		(15,000,000)		(27,000,000)		(18,000,000)		(27,000,000)
Settlements		(42,000,000)		(26,000,000)		(73,000,000)		(38,000,000)
Transfers into Level 3		132,000,000		98,000,000		387,000,000		244,000,000
Transfers out of Level 3		(205,000,000)		(146,000,000)		(479,000,000)		(364,000,000)
Balance, at the end of the period		457,000,000		427,000,000		457,000,000		427,000,000
Changes in unrealized gains/ (losses) included in income relating to assets held at end of period	[1]			1,000,000		(1,000,000)		2,000,000
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		1,889,000,000		1,993,000,000		1,935,000,000		1,936,000,000
Total gains (losses) included in net income		67,000,000	[3]	106,000,000	[4]	98,000,000	[4]	186,000,000	[4]
Total gains (losses) included in other comprehensive loss		117,000,000		52,000,000		7,000,000		67,000,000
Purchases		4,000,000		240,000,000		346,000,000		259,000,000
Sales		(98,000,000)		(2,000,000)		(407,000,000)		(70,000,000)
Transfers into Level 3								11,000,000
Balance, at the end of the period		1,979,000,000		2,389,000,000		1,979,000,000		2,389,000,000
Changes in unrealized gains/ (losses) included in income relating to assets held at end of period		58,000,000	[3]	108,000,000	[4]			186,000,000	[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		(5,933,000,000)		(5,225,000,000)		(6,030,000,000)		(4,804,000,000)
Total gains (losses) included in net income		23,000,000	[2]	(15,000,000)	[1]	29,000,000	[1]	(25,000,000)	[1]
Issues		(569,000,000)		(608,000,000)		(569,000,000)		(1,064,000,000)
Settlements		38,000,000		337,000,000		83,000,000		382,000,000
Balance, at the end of the period		(6,487,000,000)		(5,511,000,000)		(6,487,000,000)		(5,511,000,000)
Changes in unrealized gains/ (losses) included in income relating to liabilities held at end of period		$ (23,000,000)	[2]	$ 19,000,000	[1]	$ 29,000,000	[1]	$ 10,000,000	[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.