Variable Interest Entities - Schedule of Assets and Liabilities (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Variable Interest Entity [Line Items]
Assets	$ 17,614	$ 15,334
Liabilities	11,218	8,629
Variable Interest Entity, Primary Beneficiary | Fund investments | Cash and cash equivalents
Variable Interest Entity [Line Items]
Assets	88	117
Variable Interest Entity, Primary Beneficiary | Fund investments | Obligations of state and political subdivisions
Variable Interest Entity [Line Items]
Assets	93	61
Variable Interest Entity, Primary Beneficiary | Fund investments | Structured products
Variable Interest Entity [Line Items]
Assets	53	39
Variable Interest Entity, Primary Beneficiary | Fund investments | Corporate securities
Variable Interest Entity [Line Items]
Assets	2	9
Variable Interest Entity, Primary Beneficiary | Fund investments | Equity securities
Variable Interest Entity [Line Items]
Assets	43	18
Variable Interest Entity, Primary Beneficiary | Fund investments | Due from brokers and counterparties
Variable Interest Entity [Line Items]
Assets	25	35
Variable Interest Entity, Primary Beneficiary | Fund investments | Other
Variable Interest Entity [Line Items]
Assets	2	0
Variable Interest Entity, Primary Beneficiary | CLOs | Cash and cash equivalents
Variable Interest Entity [Line Items]
Assets	50	17
Variable Interest Entity, Primary Beneficiary | CLOs | Due from brokers and counterparties
Variable Interest Entity [Line Items]
Assets	91	17
Variable Interest Entity, Primary Beneficiary | CLOs | Loans in CLOs, fair value option, collateralized financing entity (CFE)
Variable Interest Entity [Line Items]
Assets	3,174	1,291
Variable Interest Entity, Primary Beneficiary | CLOs | Loans in CLO warehouses, fair value option
Variable Interest Entity [Line Items]
Assets	498	170
Variable Interest Entity, Primary Beneficiary | CLOs | Short-term investments
Variable Interest Entity [Line Items]
Assets	252	139
Variable Interest Entity, Primary Beneficiary | Assets of Consolidated Investment Vehicles
Variable Interest Entity [Line Items]
Assets	4,371	1,913
Variable Interest Entity, Primary Beneficiary | Liabilities of CIVs
Variable Interest Entity [Line Items]
Liabilities	3,886	1,590
Variable Interest Entity, Primary Beneficiary | Liabilities of CIVs | CLO obligations of CFEs
Variable Interest Entity [Line Items]
Liabilities	$ 2,937	$ 1,227
CLO's weighted average maturity	6 years 3 months 18 days	5 years 7 months 6 days
CLO's weighted average interest rate	1.90%	2.40%
Variable Interest Entity, Primary Beneficiary | Liabilities of CIVs | Warehouse financing debt
Variable Interest Entity [Line Items]
Liabilities	$ 275	$ 25
CLO's weighted average maturity	1 year 1 month 6 days	1 year 8 months 12 days
CLO's weighted average interest rate	1.30%	1.70%
Variable Interest Entity, Primary Beneficiary | Liabilities of CIVs | Securities sold short
Variable Interest Entity [Line Items]
Liabilities	$ 31	$ 47
Variable Interest Entity, Primary Beneficiary | Liabilities of CIVs | Due to brokers and counterparties
Variable Interest Entity [Line Items]
Liabilities	642	290
Variable Interest Entity, Primary Beneficiary | Liabilities of CIVs | Other liabilities
Variable Interest Entity [Line Items]
Liabilities	1	1
Voting Interest Entity | Assets of Consolidated Investment Vehicles | Investments
Variable Interest Entity [Line Items]
Assets	$ 5	$ 10