Variable Interest Entities (Changes in Level 3 Assets and Liabilities) (Details 2) - Consolidated investment entities [Member] - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2017	Mar. 31, 2016
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
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		0
Transfers into Level 3		2
Balance, at the end of the period		2
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		5	3
Transfers into Level 3		1	2
Transfers out of Level 3		(2)	(1)
Balance, at the end of the period		4	2
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		254	529
Total gains (losses) included in net income	[1]	3	(9)
Purchases		55	15
Sales		(8)
Settlements		(23)	(10)
Transfers into Level 3		72	139
Transfers out of Level 3		(130)	(60)
Balance, at the end of the period		223	300
Changes in unrealized gains/(losses) relating to assets held at end of period	[1]	$ 2	(10)
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
Balance, at the end of the period			0
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)
Balance, at the end of the period			0
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	[2]		(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	[2]		(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	[2]		(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	[2]		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] The cumulative effect of change in accounting policies includes the adoption impact of ASU 2015-02 - Consolidation: Amendments to the Consolidation Analysis and ASU 2014-13 – Consolidation: Measuring the Financial Assets and the Financial Liabilities of a Consolidated Collateralized Financing Entity.