Fair Value Measurements - Summary of Changes in Fair Value of Investments Measured Using Level 3 Inputs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value, beginning of period	$ 43,504,923	$ 39,746,981
Purchases of investments	23,128,563	7,035,017
Proceeds from principal repayments and sales of investments	(5,336,136)	(3,267,356)
Accretion of discount/(amortization of premium)	200,170	156,540
Transfers into Level 3	573,930	211,271
Transfers out of Level 3	(164,057)	(479,971)
Fair value, end of period	61,482,810	43,504,923
Net change in unrealized appreciation (depreciation) included in earnings related to financial instruments, included in net unrealized appreciation (depreciation) on the Consolidated Statements of Operations	(331,999)	118,994
Investments, Realized Gain (Loss)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net realized gain (loss)	(82,526)	(61,537)
Investments, Unrealized Gain (Loss)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net realized gain (loss)	(342,057)	163,978
First lien debt
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value, beginning of period	41,336,737	37,543,544
Purchases of investments	20,629,885	6,804,817
Proceeds from principal repayments and sales of investments	(4,988,486)	(3,138,778)
Accretion of discount/(amortization of premium)	195,139	153,553
Transfers into Level 3	425,686	211,271
Transfers out of Level 3	(35,508)	(207,514)
Fair value, end of period	57,154,971	41,336,737
Net change in unrealized appreciation (depreciation) included in earnings related to financial instruments, included in net unrealized appreciation (depreciation) on the Consolidated Statements of Operations	(322,167)	3,815
Debt Securities, First Lien, Realized Gain (Loss)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net realized gain (loss)	(82,367)	(79,934)
Debt Securities, First Lien, Unrealized Gain (Loss)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net realized gain (loss)	(326,115)	49,778
Second lien debt
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value, beginning of period	926,865	1,152,723
Purchases of investments	1,435,404	58,588
Proceeds from principal repayments and sales of investments	(197,826)	(35,675)
Accretion of discount/(amortization of premium)	4,391	2,761
Transfers into Level 3	77,280	0
Transfers out of Level 3	(128,501)	(272,457)
Fair value, end of period	2,088,319	926,865
Net change in unrealized appreciation (depreciation) included in earnings related to financial instruments, included in net unrealized appreciation (depreciation) on the Consolidated Statements of Operations	(27,724)	17,206
Debt Securities, Second Lien, Realized Gain (Loss)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net realized gain (loss)	(573)	59
Debt Securities, Second Lien, Unrealized Gain (Loss)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net realized gain (loss)	(28,721)	20,866
Unsecured debt
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value, beginning of period	18,171	0
Purchases of investments	140,166	18,171
Proceeds from principal repayments and sales of investments	0	0
Accretion of discount/(amortization of premium)	109	10
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Fair value, end of period	157,115	18,171
Net change in unrealized appreciation (depreciation) included in earnings related to financial instruments, included in net unrealized appreciation (depreciation) on the Consolidated Statements of Operations	(1,331)	(10)
Debt Securities, Unsecured Debt, Net Realized Gain (Loss)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net realized gain (loss)	0	0
Debt Securities, Unsecured Debt, Net Unrealized Gain (Loss)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net realized gain (loss)	(1,331)	(10)
Structured finance obligations - debt instruments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value, beginning of period	365,899
Purchases of investments	253,909
Proceeds from principal repayments and sales of investments	(115,749)
Accretion of discount/(amortization of premium)	523
Transfers into Level 3	70,964
Transfers out of Level 3	0
Fair value, end of period	590,509	365,899
Net change in unrealized appreciation (depreciation) included in earnings related to financial instruments, included in net unrealized appreciation (depreciation) on the Consolidated Statements of Operations	13,440
Structured Finance, Debt Instrument, Realized Gain (Loss)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net realized gain (loss)	414
Structured Finance, Debt Instruments, Unrealized Gain (Loss)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net realized gain (loss)	14,549
Structured finance obligations - equity instruments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value, beginning of period	0
Purchases of investments	157,817
Proceeds from principal repayments and sales of investments	(20,575)
Accretion of discount/(amortization of premium)	8
Transfers into Level 3	0
Transfers out of Level 3	0
Fair value, end of period	141,139	0
Net change in unrealized appreciation (depreciation) included in earnings related to financial instruments, included in net unrealized appreciation (depreciation) on the Consolidated Statements of Operations	3,889
Structured Finance, Equity Instrument, Realized Gain (Loss)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net realized gain (loss)	0
Structured Finance, Equity Instrument, Unrealized Gain (Loss)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net realized gain (loss)	3,889
Structured finance obligations
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value, beginning of period	365,899	293,335
Purchases of investments		63,265
Proceeds from principal repayments and sales of investments		(20,978)
Accretion of discount/(amortization of premium)		216
Transfers into Level 3		0
Transfers out of Level 3		0
Fair value, end of period		365,899
Net change in unrealized appreciation (depreciation) included in earnings related to financial instruments, included in net unrealized appreciation (depreciation) on the Consolidated Statements of Operations		29,930
Structured Finance, Realized Gain (Loss)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net realized gain (loss)		(491)
Structured Finance, Unrealized Gain (Loss)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net realized gain (loss)		30,552
Equity investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value, beginning of period	857,251	757,379
Purchases of investments	511,382	90,176
Proceeds from principal repayments and sales of investments	(13,500)	(71,925)
Accretion of discount/(amortization of premium)	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	(48)	0
Fair value, end of period	1,350,757	857,251
Net change in unrealized appreciation (depreciation) included in earnings related to financial instruments, included in net unrealized appreciation (depreciation) on the Consolidated Statements of Operations	1,894	68,053
Equity Securities, Realized Gain (Loss)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net realized gain (loss)	0	18,829
Equity Securities, Unrealized Gain (Loss)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net realized gain (loss)	$ (4,328)	$ 62,792