Variable Interest Entities - Schedule of Assets and Liabilities (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Variable Interest Entity [Line Items]
Assets	$ 16,018	$ 15,334
Liabilities	9,525	8,629
Variable Interest Entity, Primary Beneficiary | Fund investments | Cash and cash equivalents
Variable Interest Entity [Line Items]
Assets	57	117
Variable Interest Entity, Primary Beneficiary | Fund investments | Corporate securities
Variable Interest Entity [Line Items]
Assets	0	9
Variable Interest Entity, Primary Beneficiary | Fund investments | Structured products
Variable Interest Entity [Line Items]
Assets	50	39
Variable Interest Entity, Primary Beneficiary | Fund investments | Obligations of state and political subdivisions
Variable Interest Entity [Line Items]
Assets	94	61
Variable Interest Entity, Primary Beneficiary | Fund investments | Equity securities and warrants
Variable Interest Entity [Line Items]
Assets	10	18
Variable Interest Entity, Primary Beneficiary | Fund investments | Other (2)
Variable Interest Entity [Line Items]
Assets	1	0
Variable Interest Entity, Primary Beneficiary | Fund investments | Due from brokers and counterparties
Variable Interest Entity [Line Items]
Assets	53	35
Variable Interest Entity, Primary Beneficiary | CLOs and CLO warehouse assets | Cash and cash equivalents
Variable Interest Entity [Line Items]
Assets	193	17
Variable Interest Entity, Primary Beneficiary | CLOs and CLO warehouse assets | Due from brokers and counterparties
Variable Interest Entity [Line Items]
Assets	59	17
Variable Interest Entity, Primary Beneficiary | CLOs and CLO warehouse assets | Loans in CLOs at fair value, collateralized financing entity (CFE)
Variable Interest Entity [Line Items]
Assets	2,114	1,291
Variable Interest Entity, Primary Beneficiary | CLOs and CLO warehouse assets | Loans in CLO warehouses, at fair value option
Variable Interest Entity [Line Items]
Assets	189	170
Variable Interest Entity, Primary Beneficiary | CLOs and CLO warehouse assets | Short-term investments
Variable Interest Entity [Line Items]
Assets	136	139
Variable Interest Entity, Primary Beneficiary | Assets of Consolidated Investment Vehicles
Variable Interest Entity [Line Items]
Assets	2,956	1,913
Variable Interest Entity, Primary Beneficiary | Liabilities of CIVs
Variable Interest Entity [Line Items]
Liabilities	2,573	1,590
Variable Interest Entity, Primary Beneficiary | Liabilities of CIVs | CLO obligations of CFE
Variable Interest Entity [Line Items]
Liabilities	$ 1,973	$ 1,227
CLO's weighted average maturity	6 years	5 years 7 months 6 days
CLO's weighted average interest rate	2.10%	2.40%
Variable Interest Entity, Primary Beneficiary | Liabilities of CIVs | Long Term Debt
Variable Interest Entity [Line Items]
Liabilities	$ 68	$ 25
CLO's weighted average maturity	8 months 12 days	1 year 8 months 12 days
CLO's weighted average interest rate	1.50%	1.70%
Variable Interest Entity, Primary Beneficiary | Liabilities of CIVs | Securities sold short
Variable Interest Entity [Line Items]
Liabilities	$ 55	$ 47
Variable Interest Entity, Primary Beneficiary | Liabilities of CIVs | Due to brokers and counterparties
Variable Interest Entity [Line Items]
Liabilities	477	290
Variable Interest Entity, Primary Beneficiary | Liabilities of CIVs | Other liabilities (2)
Variable Interest Entity [Line Items]
Liabilities	0	1
Affiliated Entity | Assets of Consolidated Investment Vehicles | Investments
Variable Interest Entity [Line Items]
Assets	10	10
Voting Interest Entity | Assets of Consolidated Investment Vehicles | Investments
Variable Interest Entity [Line Items]
Assets	$ 57	$ 10