Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

Name:	us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Asset Management Fees - Asset Management Fees (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Disaggregation of Revenue [Line Items]
Asset management fees	$ 23	$ 0
CLOs [Member]
Disaggregation of Revenue [Line Items]
Asset management fees	4
Opportunity funds [Member]
Disaggregation of Revenue [Line Items]
Asset management fees	2
Wind-down funds [Member]
Disaggregation of Revenue [Line Items]
Asset management fees	9
Asset management fees [Member]
Disaggregation of Revenue [Line Items]
Asset management fees	15
Reimbursable fund expense [Member]
Disaggregation of Revenue [Line Items]
Asset management fees	8
Performance fees [Member]
Disaggregation of Revenue [Line Items]
Asset management fees	0
CLO's, Before Rebates [Member]
Disaggregation of Revenue [Line Items]
Asset management fees	$ 10