Variable Interest Entities (Changes in Level 3 Assets and Liabilities) (Details 2) (Consolidated investment entities [Member], USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014
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			$ 2
Total gains (losses) included in net income			1	[1]
Purchases			2
Sales			(2)
Transfers into Level 3			10
Balance, at the end of the period			13
Changes in unrealized gains/ (losses) included in income relating to assets held at end of period			1	[1]
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	7		14
Total gains (losses) included in net income	(1)	[1]	2	[1]
Transfers into Level 3	5		6
Transfers out of Level 3			(12)
Balance, at the end of the period	11		10
Changes in unrealized gains/ (losses) included in income relating to assets held at end of period	(1)	[1]	2	[1]
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	484		368
Total gains (losses) included in net income	(1)	[1]	4	[1]
Purchases	37		96
Sales	(3)
Settlements	(31)		(12)
Transfers into Level 3	255		146
Transfers out of Level 3	(274)		(218)
Balance, at the end of the period	467		384
Changes in unrealized gains/ (losses) included in income relating to assets held at end of period	(1)	[1]	3	[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	1,935		1,936
Total gains (losses) included in net income	31	[2]	80	[2]
Total gains (losses) included in other comprehensive loss	(110)		15
Purchases	342		19
Sales	(309)		(68)
Transfers into Level 3			11
Balance, at the end of the period	1,889		1,993
Changes in unrealized gains/ (losses) included in income relating to assets held at end of period	(58)	[2]	78	[2]
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	6,030		4,804
Total gains (losses) included in net income	(51)	[1]	(10)	[1]
Issues			456
Settlements	46		45
Balance, at the end of the period	(5,933)		5,225
Changes in unrealized gains/ (losses) included in income relating to liabilities held at end of period	$ 51	[1]	$ (10)	[1]

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

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