Fair Value of Financial Instruments - Roll Forward Level III (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Accretion of discount (amortization of premium)	$ 15	$ 29
Total
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value at beginning of period	13,385	13,972
Accretion of discount (amortization of premium)	12	27
Purchases	287	2,056
Paid-in-kind interest	30	32
Sales and repayments	(401)	(1,791)
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Fair value at end of period	13,325	14,290
The amount of total gains or losses for the period included in changes in net assets attributable to the change in unrealized gains or losses relating to investments still held at the reporting date	(1)	(6)
Total | Net realized gain (loss)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net realized gain (loss)	(59)	(32)
Total | Net change in unrealized appreciation (depreciation)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net realized gain (loss)	71	26
Funded, Senior Secured Loans—First Lien
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value at beginning of period	9,124	9,542
Accretion of discount (amortization of premium)	11	22
Purchases	235	1,166
Paid-in-kind interest	15	10
Sales and repayments	(234)	(1,006)
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Fair value at end of period	9,170	9,665
The amount of total gains or losses for the period included in changes in net assets attributable to the change in unrealized gains or losses relating to investments still held at the reporting date	17	(71)
Funded, Senior Secured Loans—First Lien | Net realized gain (loss)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net realized gain (loss)	2	(71)
Funded, Senior Secured Loans—First Lien | Net change in unrealized appreciation (depreciation)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net realized gain (loss)	17	2
Net Senior Secured Loans—Second Lien
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value at beginning of period	874	1,205
Accretion of discount (amortization of premium)	1	2
Purchases	3	4
Paid-in-kind interest	0	0
Sales and repayments	(4)	(97)
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Fair value at end of period	856	1,073
The amount of total gains or losses for the period included in changes in net assets attributable to the change in unrealized gains or losses relating to investments still held at the reporting date	(20)	(37)
Net Senior Secured Loans—Second Lien | Net realized gain (loss)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net realized gain (loss)	(20)	(4)
Net Senior Secured Loans—Second Lien | Net change in unrealized appreciation (depreciation)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net realized gain (loss)	2	(37)
Other Senior Secured Debt
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value at beginning of period	22	29
Accretion of discount (amortization of premium)	0	0
Purchases	0	0
Paid-in-kind interest	0	0
Sales and repayments	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Fair value at end of period	20	27
The amount of total gains or losses for the period included in changes in net assets attributable to the change in unrealized gains or losses relating to investments still held at the reporting date	(2)	(2)
Other Senior Secured Debt | Net realized gain (loss)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net realized gain (loss)	0	0
Other Senior Secured Debt | Net change in unrealized appreciation (depreciation)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net realized gain (loss)	(2)	(2)
Net Subordinated Debt
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value at beginning of period	264	74
Accretion of discount (amortization of premium)	0	0
Purchases	10	0
Paid-in-kind interest	5	0
Sales and repayments	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Fair value at end of period	279	34
The amount of total gains or losses for the period included in changes in net assets attributable to the change in unrealized gains or losses relating to investments still held at the reporting date	0	(40)
Net Subordinated Debt | Net realized gain (loss)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net realized gain (loss)	0	0
Net Subordinated Debt | Net change in unrealized appreciation (depreciation)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net realized gain (loss)	0	(40)
Net Asset Based Finance
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value at beginning of period	1,902	2,245
Accretion of discount (amortization of premium)	0	3
Purchases	30	556
Paid-in-kind interest	3	11
Sales and repayments	(147)	(627)
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Fair value at end of period	1,778	2,178
The amount of total gains or losses for the period included in changes in net assets attributable to the change in unrealized gains or losses relating to investments still held at the reporting date	(17)	(17)
Net Asset Based Finance | Net realized gain (loss)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net realized gain (loss)	7	16
Net Asset Based Finance | Net change in unrealized appreciation (depreciation)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net realized gain (loss)	(17)	(26)
Equity/Other
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value at beginning of period	1,199	877
Accretion of discount (amortization of premium)	0	0
Purchases	9	330
Paid-in-kind interest	7	11
Sales and repayments	(16)	(61)
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Fair value at end of period	1,222	1,313
The amount of total gains or losses for the period included in changes in net assets attributable to the change in unrealized gains or losses relating to investments still held at the reporting date	21	161
Equity/Other | Net realized gain (loss)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net realized gain (loss)	(48)	27
Equity/Other | Net change in unrealized appreciation (depreciation)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net realized gain (loss)	$ 71	$ 129