Variable Interest Entities (FV Options for consolidated CDOs) (Details 3) - Consolidated investment entities [Member] - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Syndicated loans [Abstract]
Unpaid principal balance		$ 1,747		$ 1,747		$ 1,743
Excess unpaid principal over fair value		(54)		(54)		(52)
Fair value		1,693		1,693		1,691
Fair value of loans more than 90 days past due		10		10		0
Fair value of loans in nonaccrual status		10		10		0
Difference between fair value and unpaid principal of loans more than 90 days past due, loans in nonaccrual status or both		1		1		0
Debt [Abstract]
Unpaid principal balance		1,864		1,864		1,951
Excess unpaid principal over fair value		(157)		(157)		(208)
Carrying value	[1]	1,707		1,707		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		$ (1)	$ 25	$ (5)	$ 24

[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 June 30, 2019 and December 31, 2018.