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
		Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
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	$ 4	$ 0	$ 4
Total gains (losses) included in net income	[1]		2		6
Sales					(4)
Transfers into Level 3				1	4
Transfers out of Level 3		(1)		(1)	(4)
Balance, at the end of the period		0	6	0	6
Changes in unrealized gains (losses) included in income relating to assets held at end of period	[1]		2		4
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		130	111	226	180
Total gains (losses) included in net income	[1]		1	(1)	2
Purchases		26	9	75	51
Sales			(3)	(8)	(39)
Settlements		(25)	(10)	(36)	(40)
Transfers into Level 3		81	52	165	130
Transfers out of Level 3		(77)	(39)	(286)	(163)
Balance, at the end of the period		135	$ 121	135	$ 121
Changes in unrealized gains (losses) included in income relating to assets held at end of period	[1]	$ (1)		$ (2)

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