Joint Venture - Balance Sheet Information (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
ASSETS
Investment Owned, at Fair Value	$ 68,419,777	$ 50,743,911
Cost	68,985,671	51,021,723
Cash and cash equivalents	1,650,679	1,481,770	$ 1,351,901	$ 617,986
Receivable for investments	38,838	101,460
Deferred financing costs	132,751	93,836
Total assets	71,283,570	53,317,236
LIABILITIES
Debt	30,452,578	23,179,861
Unamortized debt issuance costs	136,810	91,634
Distribution payable	331,762	245,032
Total liabilities	32,427,807	24,782,799
Stockholders' Equity Attributable to Parent [Abstract]
Members’ equity	15,286	11,239
Total net assets	38,855,763	28,534,437	$ 22,685,065	$ 12,854,820
Total liabilities and net assets	71,283,570	53,317,236
Nonconsolidated Investee | BCRED Emerald JV LP
ASSETS
Investment Owned, at Fair Value	5,647,024	5,325,685
Cost	5,730,939	5,326,183
Cash and cash equivalents	150,661	129,214
Interest receivable	34,431	44,034
Receivable for investments	65,644	17,056
Deferred financing costs	11,005	15,576
Total assets	5,908,765	5,531,565
LIABILITIES
Debt	2,169,241	2,672,363
Distribution payable	75,514	106,593
Interest payable and other liabilities	1,292,277	42,929
Total liabilities	3,537,032	2,821,885
Stockholders' Equity Attributable to Parent [Abstract]
Members’ equity	2,371,733	2,709,680
Total net assets	2,371,733	2,709,680
Total liabilities and net assets	5,908,765	5,531,565
Nonconsolidated Investee | BCRED Verdelite JV LP
ASSETS
Investment Owned, at Fair Value	650,532	591,886
Cost	645,881	582,598
Cash and cash equivalents	149,243	6,307
Interest receivable	4,502	2,777
Receivable for investments	936	3,574
Deferred financing costs	0	711
Total assets	805,213	605,255
LIABILITIES
Debt	634,716	356,700
Unamortized debt issuance costs	1,638	0
Distribution payable	0	21,310
Interest payable and other liabilities	15,512	79,513
Total liabilities	650,228	457,523
Stockholders' Equity Attributable to Parent [Abstract]
Members’ equity	154,985	147,732
Total net assets	154,985	147,732
Total liabilities and net assets	$ 805,213	$ 605,255