Variable Interest Entities (Change in Level 3 Assets and Liabilities) (Details 2) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Summary of changes in Level 3 liabilities measured at fair value on a recurring basis [Roll Forward]
Transfers from Level 1 to Level 2, Assets		$ 0	$ 0	$ 0
Transfers from Level 2 to Level 1, Assets		0	0	0
Transfers from Level 1 to Level 2, Liabilities		0	0	0
Transfers from Level 2 to Level 1, Liabilities		0	0	0
Consolidated investment entities [Member]
Summary of changes in Level 3 liabilities measured at fair value on a recurring basis [Roll Forward]
Transfers from Level 1 to Level 2, Assets		0	0	0
Transfers from Level 2 to Level 1, Assets		0	0	0
Transfers from Level 1 to Level 2, Liabilities		0	0	0
Transfers from Level 2 to Level 1, Liabilities		0	0	0
Corporate debt securities [Member] | Consolidated investment entities [Member]
Summary of changes in Level 3 assets held by consolidated investment entities
Balance, at the beginning of the period			0	2
Total gains (losses) included in net income	[1]			1
Purchases				2
Sales				(9)
Transfers into Level 3				10
Transfers out of Level 3				(6)
Balance, at the end of the period				0
Common stocks [Member] | Consolidated investment entities [Member]
Summary of changes in Level 3 assets held by consolidated investment entities
Balance, at the beginning of the period		3	7	14
Total gains (losses) included in net income	[1]	2	(1)	1
Purchases		1
Sales				(2)
Transfers into Level 3		3	7	13
Transfers out of Level 3		(2)	(10)	(19)
Balance, at the end of the period		5	3	7
Changes in unrealized gains/ (losses) included in income relating to assets held at end of period	[1]	1
Syndicated loans [Member] | Consolidated investment entities [Member]
Summary of changes in Level 3 assets held by consolidated investment entities
Balance, at the beginning of the period		529	484	368
Total gains (losses) included in net income	[1]	7	(24)	2
Purchases		145	303	417
Sales		(24)	(36)	(42)
Settlements		(69)	(161)	(100)
Transfers into Level 3		405	776	551
Transfers out of Level 3		(435)	(813)	(712)
Balance, at the end of the period		254	529	484
Changes in unrealized gains/ (losses) included in income relating to assets held at end of period	[1]	3	(19)	(3)
Other assets [Member] | Consolidated investment entities [Member]
Summary of changes in Level 3 assets held by consolidated investment entities
Balance, at the beginning of the period		2,065	1,935	1,936
Total gains (losses) included in net income	[2]	1	170	421
Total gains (losses) included in other comprehensive income (loss)			(154)	(175)
Purchases			638	289
Sales		(1)	(524)	(547)
Transfers into Level 3				11
Balance, at the end of the period		0	2,065	1,935
Changes in unrealized gains/ (losses) included in income relating to assets held at end of period	[2]		20	362
CLO Debt [Member] | Consolidated investment entities [Member]
Summary of changes in Level 3 liabilities measured at fair value on a recurring basis [Roll Forward]
Balance, at the beginning of the period		(6,630)	(6,030)	(4,804)
Total gains (losses) included in net income	[1]		215	(34)
Issues			(1,267)	(1,670)
Settlements			452	478
Balance, at the end of the period		0	(6,630)	(6,030)
Changes in unrealized gains/ (losses) included in income relating to liabilities held at end of period	[1]		219	$ 1
Adjustments for New Accounting Pronouncement [Member] | Common stocks [Member] | Consolidated investment entities [Member]
Summary of changes in Level 3 assets held by consolidated investment entities
Balance, at the beginning of the period	[3]	(2)
Balance, at the end of the period	[3]		(2)
Adjustments for New Accounting Pronouncement [Member] | Syndicated loans [Member] | Consolidated investment entities [Member]
Summary of changes in Level 3 assets held by consolidated investment entities
Balance, at the beginning of the period	[3]	(304)
Balance, at the end of the period	[3]		(304)
Adjustments for New Accounting Pronouncement [Member] | Other assets [Member] | Consolidated investment entities [Member]
Summary of changes in Level 3 assets held by consolidated investment entities
Balance, at the beginning of the period	[3]	(2,065)
Balance, at the end of the period	[3]		(2,065)
Adjustments for New Accounting Pronouncement [Member] | CLO Debt [Member] | Consolidated investment entities [Member]
Summary of changes in Level 3 liabilities measured at fair value on a recurring basis [Roll Forward]
Balance, at the beginning of the period	[3]	6,630
Balance, at the end of the period	[3]		6,630
Adjusted for change in accounting policies [Member] [Member] | Common stocks [Member] | Consolidated investment entities [Member]
Summary of changes in Level 3 assets held by consolidated investment entities
Balance, at the beginning of the period		1
Balance, at the end of the period			1
Adjusted for change in accounting policies [Member] [Member] | Syndicated loans [Member] | Consolidated investment entities [Member]
Summary of changes in Level 3 assets held by consolidated investment entities
Balance, at the beginning of the period		225
Balance, at the end of the period			225
Adjusted for change in accounting policies [Member] [Member] | Other assets [Member] | Consolidated investment entities [Member]
Summary of changes in Level 3 assets held by consolidated investment entities
Balance, at the beginning of the period		0
Balance, at the end of the period			0
Adjusted for change in accounting policies [Member] [Member] | CLO Debt [Member] | Consolidated investment entities [Member]
Summary of changes in Level 3 liabilities measured at fair value on a recurring basis [Roll Forward]
Balance, at the beginning of the period		$ 0
Balance, at the end of the period			$ 0

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

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

[3] The cumulative effect of change in accounting policies includes the adoption impact of ASU 2015-02 and ASU 2014-13 – Consolidation: Measuring the Financial Assets and the Financial Liabilities of a Consolidated Collateralized Financing Entity (“ASU 2014-13”).