Variable Interest Entities (FV Option for Consolidated CLOs) (Details 3) - Consolidated investment entities [Member] - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Syndicated loans [Abstract]
Unpaid principal balance		$ 1,678	$ 1,743
Excess estimated unpaid principal over fair value		(81)	(52)
Fair value		1,597	1,691
Fair value of loans more than 90 days past due		4	0
Fair value of loans in nonaccrual status		42	0
Difference between fair value and unpaid principal of loans more than 90 days past due, loans in nonaccrual status or both		18	0
Debt [Abstract]
Unpaid principal balance		1,761	1,951
Excess estimated unpaid principal over fair value		(133)	(208)
Fair value	[1]	1,628	1,743
Estimated fair value of CLO debt		1,700	1,700
Net investment income [Member]
Debt [Abstract]
Total net gains (losses) recognized in net investment income related to changes in the fair v		$ (9)	$ 47	$ (5)

[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 as of both December 31, 2019 and 2018.