Variable Interest Entities (Changes in Level 3 Assets and Liabilities) (Details 2) - Consolidated investment entities [Member] - USD ($) $ in Millions		3 Months Ended		9 Months Ended		12 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Summary of changes in Level 3 liabilities measured at fair value on a recurring basis [Rollforward]
Transfers from Level 1 to Level 2, assets		$ 0	$ 0	$ 0	$ 0
Transfers from Level 2 to Level 1, assets		0	0	0	0
Transfers from Level 1 to Level 2, liabilities		0	0	0	0
Transfers from Level 2 to Level 1, liabilities		0	0	0	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		1	11	3	7	$ 7
Total gains (losses) included in net income	[1]				(1)
Purchases		1		1
Transfers into Level 3		1		3	5
Transfers out of Level 3			(5)	(2)	(5)
Balance, at the end of the period		3	6	3	6	3
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		243	457	529	484	484
Total gains (losses) included in net income	[1]	2	(8)	1	(8)
Purchases		50	101	100	257
Sales		(10)	(5)	(11)	(23)
Settlements		(26)	(32)	(51)	(105)
Transfers into Level 3		57	136	286	523
Transfers out of Level 3		(120)	(195)	(354)	(674)
Balance, at the end of the period		196	454	196	454	529
Changes in unrealized gains/(losses) relating to assets held at end of period	[1]	2	(9)	1	(11)
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	1,979	2,065	1,935	1,935
Total gains (losses) included in net income	[2]		24	1	122
Total gains (losses) included in other comprehensive income (loss)			(61)		(54)
Purchases			193		539
Sales			(6)		(413)
Balance, at the end of the period		1	2,129	1	2,129	2,065
Changes in unrealized gains/(losses) relating to assets held at end of period	[2]		26		26
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)	(6,630)	(6,030)	(6,030)
Total gains (losses) included in net income	[1]		67		96
Issues			(699)		(1,268)
Settlements			143		226
Balance, at the end of the period		$ 0	(6,976)	0	(6,976)	(6,630)
Changes in unrealized (gains)/losses relating to liabilities held at end of period	[1]		$ 67		$ 96
Adjustments for New Accounting Pronouncement [Member] | 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	[3]			(2)
Balance, at the end of the period	[3]					(2)
Adjustments for New Accounting Pronouncement [Member] | 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	[3]			(304)
Balance, at the end of the period	[3]					(304)
Adjustments for New Accounting Pronouncement [Member] | 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	[3]			(2,065)
Balance, at the end of the period	[3]					(2,065)
Adjustments for New Accounting Pronouncement [Member] | 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	[3]			6,630
Balance, at the end of the period	[3]					6,630
Adjusted for change in accounting policies [Member] | 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				1
Balance, at the end of the period						1
Adjusted for change in accounting policies [Member] | 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				225
Balance, at the end of the period						225
Adjusted for change in accounting policies [Member] | 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				0
Balance, at the end of the period						0
Adjusted for change in accounting policies [Member] | 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				$ 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”).