Variable Interest Entities (FV Options for consolidated CDOs) (Details 3) - 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	Dec. 31, 2018
Syndicated loans [Abstract]
Unpaid principal balance		$ 1,705		$ 1,705		$ 1,743
Excess unpaid principal over fair value		(65)		(65)		(52)
Fair value		1,640		1,640		1,691
Fair value of loans more than 90 days past due		10		10		0
Fair value of loans in nonaccrual status		46		46		0
Difference between fair value and unpaid principal of loans more than 90 days past due, loans in nonaccrual status or both		12		12		0
Debt [Abstract]
Unpaid principal balance		1,788		1,788		1,951
Excess unpaid principal over fair value		(118)		(118)		(208)
Carrying value	[1]	1,670		1,670		1,743
Estimated fair value of CLO debt		1,700		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 value of financial assets and liabilities for which the fair value option was elected		$ (3)	$ 5	$ (8)	$ 29

[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 September 30, 2019 and December 31, 2018.