Asset Management Fees - Asset Management Fees (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disaggregation of Revenue [Line Items]
Asset management fees	$ 20	$ 0	$ 43	$ 0
CLOs [Member]
Disaggregation of Revenue [Line Items]
Asset management fees	3		7
Opportunity funds [Member]
Disaggregation of Revenue [Line Items]
Asset management fees	2		4
Wind-down funds [Member]
Disaggregation of Revenue [Line Items]
Asset management fees	6		15
Asset management fees [Member]
Disaggregation of Revenue [Line Items]
Asset management fees	11		26
Reimbursable fund expense [Member]
Disaggregation of Revenue [Line Items]
Asset management fees	9		17
Performance fees [Member]
Disaggregation of Revenue [Line Items]
Asset management fees	0		0
CLO's, Before Rebates [Member]
Disaggregation of Revenue [Line Items]
Asset management fees	$ 7		$ 17