Variable Interest Entities (FV Option for Consolidated CLOs) (Details 3) - Consolidated investment entities [Member] - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Syndicated loans [Abstract]
Unpaid principal balance		$ 1,743	$ 2,140
Excess estimated unpaid principal over fair value		(52)	(71)
Fair value		1,691	2,069
Fair value of loans more than 90 days past due		0	24
Fair value of loans in nonaccrual status		0	24
Difference between fair value and unpaid principal of loans more than 90 days past due, loans in nonaccrual status or both		0	35
Debt [Abstract]
Unpaid principal balance		1,951	2,340
Excess estimated unpaid principal over fair value		(208)	(134)
Fair value	[1]	1,743	2,206
CLO debt valued using DCF model		1,700	2,200
Net investment income [Member]
Debt [Abstract]
Fair Value, Option, Changes in Fair Value, Gain (Loss)		$ 47	$ (5)	$ (38)

[1] The carrying value of the CLOs’ debt is set equal to the fair value of the CLOs’ assets. The estimated fair value of the CLOs’ debt was $1.7 billion and $2.2 billion as of December 31, 2018 and 2017, respectively.