Financial Highlights (Details) - USD ($) $ / shares in Units, $ in Thousands				3 Months Ended		6 Months Ended
	Jun. 26, 2023	Mar. 30, 2023	Oct. 15, 2021	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Investment Company, Financial Highlights [Roll Forward]
Members' capital, beginning balance (in dollars per share)						$ 9.65	$ 9.50
Net investment income (in dollars per share)						0.53	0.57
Net realized and unrealized gains (losses) (in dollars per share)						0.04	0.07
Total net increase (in dollars per share)						0.57	0.64
Distributions declared to unitholders from net investment income (in dollars per share)	$ (0.300)	$ (0.285)				(0.52)	(0.585)
Distributions declared to unitholders from return of capital (in dollars per share)						(1.70)	0
Members' capital, ending balance (in dollars per share)				$ 8.00	$ 9.55	$ 8.00	$ 9.55
Total return based on members' capital						7.27%	6.81%
Units outstanding at end of period (in shares)				114,906,527	114,906,527	114,906,527	114,906,527	114,906,527
Average weighted units outstanding for the period - basic (in shares)				114,906,527	114,906,527	114,906,527	114,906,527
Average weighted units outstanding for the period - diluted (in shares)				114,906,527	114,906,527	114,906,527	114,906,527
Average members' capital for the period						$ 1,041,749	$ 1,092,874
Ratio to average members' capital:
Net investment income						11.86%	12.12%
Total expenses, before waivers/reimbursements						10.31%	9.97%
Total expenses, net of waivers/reimbursements						10.27%	9.97%
Asset coverage ratio				208.75%	212.83%	208.75%	212.83%
Portfolio turnover						0.75%	1.92%
Capital Commitments			$ 1,149,065			$ 1,149,065	$ 1,149,065
Funded Capital Commitments				$ 1,149,065	$ 1,149,065	$ 1,149,065	$ 1,149,065
% of Capital Commitments funded						100.00%	100.00%
Unsecured Notes
Ratio to average members' capital:
Average debt outstanding				260,735	$ 275,000	$ 267,867	$ 275,000
Wells Credit Facility | Line of Credit
Ratio to average members' capital:
Average debt outstanding							$ 695,793
GS Credit Facility
Ratio to average members' capital:
Average debt outstanding				$ 646,571		634,647
GS Credit Facility | Line of Credit
Ratio to average members' capital:
Average debt outstanding						$ 634,647