Variable Interest Entities (FV Options for consolidated CDOs) (Details 3) - Consolidated investment entities [Member] - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Syndicated loans [Abstract]
Unpaid principal balance		$ 1,780		$ 1,743
Excess unpaid principal over fair value		(54)		(52)
Fair value		1,726		1,691
Fair value of loans more than 90 days past due		8		0
Fair value of loans in nonaccrual status		8		0
Difference between fair value and unpaid principal of loans more than 90 days past due, loans in nonaccrual status or both		0		0
Debt [Abstract]
Unpaid principal balance		1,885		1,951
Excess unpaid principal over fair value		(154)		(208)
Carrying value	[1]	1,731		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 value of financial assets and liabilities for which the fair value option was elected		$ (4)	$ (1)

[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 March 31, 2019 and December 31, 2018.