Fair Value of Financial Instruments - Roll Forward Level III (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Accretion of discount (amortization of premium)	$ 87	$ 71	$ 15
Total
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value at beginning of period	13,972	5,807
Accretion of discount (amortization of premium)	81	60
Purchases	4,963	13,289
Paid-in-kind interest	116	109
Sales and repayments	(5,157)	(6,022)
Transfers into Level 3	0	3
Transfers out of Level 3	0	0
Fair value at end of period	13,385	13,972	5,807
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	(745)	480
Total | Net realized gain (loss)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net realized gain (loss)	158	153
Total | Net change in unrealized appreciation (depreciation)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net realized gain (loss)	(748)	573
Senior Secured Loans—First Lien
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value at beginning of period	9,542	3,276
Accretion of discount (amortization of premium)	66	46
Purchases	3,116	9,561
Paid-in-kind interest	49	22
Sales and repayments	(3,243)	(3,655)
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Fair value at end of period	9,124	9,542	3,276
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	(382)	207
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)	(76)	88
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)	(330)	204
Senior Secured Loans—Second Lien
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value at beginning of period	1,205	862
Accretion of discount (amortization of premium)	7	11
Purchases	122	1,105
Paid-in-kind interest	1	6
Sales and repayments	(299)	(813)
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Fair value at end of period	874	1,205	862
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	(125)	42
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)	(81)	(88)
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)	(81)	122
Other Senior Secured Debt
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value at beginning of period	29	36
Accretion of discount (amortization of premium)	0	0
Purchases	0	52
Paid-in-kind interest	2	1
Sales and repayments	0	(48)
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Fair value at end of period	22	29	36
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	(9)	(17)
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	(21)
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)	(9)	9
Subordinated Debt
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value at beginning of period	74	152
Accretion of discount (amortization of premium)	2	0
Purchases	223	29
Paid-in-kind interest	6	0
Sales and repayments	0	(93)
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Fair value at end of period	264	74	152
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	(41)	(14)
Subordinated Debt | Net realized gain (loss)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net realized gain (loss)	0	(7)
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)	(41)	(7)
Asset Based Finance
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value at beginning of period	2,245	951
Accretion of discount (amortization of premium)	5	3
Purchases	980	2,039
Paid-in-kind interest	28	49
Sales and repayments	(1,235)	(959)
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Fair value at end of period	1,902	2,245	951
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	(182)	166
Asset Based Finance | Net realized gain (loss)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net realized gain (loss)	113	(24)
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)	(234)	186
Equity/Other
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value at beginning of period	877	530
Accretion of discount (amortization of premium)	1	0
Purchases	522	503
Paid-in-kind interest	30	31
Sales and repayments	(380)	(454)
Transfers into Level 3	0	3
Transfers out of Level 3	0	0
Fair value at end of period	1,199	877	$ 530
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	(6)	96
Equity/Other | Net realized gain (loss)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net realized gain (loss)	202	205
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)	$ (53)	$ 59