Variable Interest Entities (FV Options for consolidated CDOs) (Details 3) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Variable Interest Entity, Primary Beneficiary [Member]
Debt [Abstract]
Carrying value	[1]	$ 1,489		$ 1,489		$ 1,628
Estimated fair value of CLO debt		1,500		1,500		1,700
Variable Interest Entity, Primary Beneficiary [Member]
Syndicated loans [Abstract]
Unpaid principal balance		1,655		1,655		1,678
Excess unpaid principal over fair value		(170)		(170)		(81)
Fair value		1,485		1,485		1,597
Fair value of loans more than 90 days past due		12		12		4
Fair value of loans in nonaccrual status		32		32		42
Difference between fair value and unpaid principal of loans more than 90 days past due, loans in nonaccrual status or both		48		48		18
Debt [Abstract]
Unpaid principal balance		1,723		1,723		1,761
Excess unpaid principal over fair value		(234)		(234)		$ (133)
Net investment income [Member] | Variable Interest Entity, Primary Beneficiary [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		$ (7)	$ (1)	$ (13)	$ (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 $1.5 billion and $1.7 billion as of June 30, 2020 and December 31, 2019, respectively.