Variable Interest Entities (Changes in Level 3 Assets and Liabilities) (Details 2) - Consolidated investment entities [Member] - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2016		Mar. 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
Transfers from Level 2 to Level 1, assets		0		0
Transfers from Level 1 to Level 2, liabilities		0		0
Transfers from Level 2 to Level 1, liabilities		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		3		7
Total gains (losses) included in net income	[1]			(1)
Transfers into Level 3		2		5
Transfers out of Level 3		(1)
Balance, at the end of the period		2		11
Changes in unrealized gains/ (losses) included in income relating to assets held at end of period	[1]			(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		529		484
Total gains (losses) included in net income		(9)	[2]	(1)	[1]
Purchases		15		37
Sales				(3)
Settlements		(10)		(31)
Transfers into Level 3		139		255
Transfers out of Level 3		(60)		(274)
Balance, at the end of the period		300		467
Changes in unrealized gains/ (losses) included in income relating to assets held at end of period		(10)	[2]	(1)	[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		2,065		1,935
Total gains (losses) included in net income	[3]			31
Total gains (losses) included in other comprehensive income (loss)				(110)
Purchases				342
Sales				(309)
Balance, at the end of the period				1,889
Changes in unrealized gains/ (losses) included in income relating to assets held at end of period	[3]			(58)
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		(6,630)		(6,030)
Total gains (losses) included in net income	[1]			51
Settlements				46
Balance, at the end of the period				(5,933)
Changes in unrealized gains/ (losses) included in income relating to liabilities held at end of period	[1]			$ 51
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	[4]	(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	[4]	(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	[4]	(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	[4]	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
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
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
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

[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] 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”). Common Stocks Syndicated Loans Other Assets Debt (in millions) Balance, January 1, 2015$7 $484 $1,935 $(6,030) Total gains (losses) included in: Net income(1)(1) (1)(1) 31(2) 51(1) Other comprehensive loss— — (110) — Purchases— 37 342 — Sales— (3) (309) — Settlements— (31) — 46 Transfers into Level 35 255 — — Transfers out of Level 3— (274) — — Balance, March 31, 2015$11 $467 $1,889 $(5,933) Changes in unrealized gains (losses) included in income relating to assets and liabilities held at March 31, 2015$(1)(1) $(1)(1) $(58)(2) $51(1)