Significant Accounting Policies (Details)	9 Months Ended
	Dec. 31, 2025 USD ($) Segment
ISQ Open Infrastructure Company LLC - Series I [Member]
Significant Accounting Policies [Line Items]
Cash	$ 7,000
Organizational expenses	328,197
Offering costs	221,784
Offering expenses	$ 48,587
Owned percentage of net assets	22.50%
Description of CODM	The chief operating decision maker (“CODM”) is comprised of the Company’s Chief Executive Officer and Chief Investment Officer (the “Principal Committee”) which assesses the performance and makes operating decisions of the Company on a consolidated basis.
Segment Reporting, CODM, Individual Title and Position or Group Name [Extensible Enumeration]	Chief Executive Officer
Deferred offering expenses.	$ 48,587
ISQ Open Infrastructure Company LLC - Series II [Member]
Significant Accounting Policies [Line Items]
Organizational expenses	2,867,509
Offering costs	1,734,837
Offering expenses	$ 1,734,837
Description of CODM	The chief operating decision maker (“CODM”) is comprised of the Company’s Chief Executive Officer and Chief Investment Officer (the “Principal Committee”) which assesses the performance and makes operating decisions of the Company on a consolidated basis.
Segment Reporting, CODM, Individual Title and Position or Group Name [Extensible Enumeration]	Chief Executive Officer
Cash equivalents	$ 2,180,513
Deferred offering expenses.	411,159
Accrued of servicing fees payable	$ 2,805,542
Percentage of gross income	90.00%
Total Return attributable	100.00%
Operating segment (in Segment) | Segment	1
Reporting segment (in Segment) | Segment	1
ISQ Open Infrastructure Company LLC - Series II [Member] | High Water Mark [Member]
Significant Accounting Policies [Line Items]
Total Return attributable	5.00%
Class F-S Shares [Member] | ISQ Open Infrastructure Company LLC - Series II [Member]
Significant Accounting Policies [Line Items]
Percentage of distribution servicing fees	0.85%
Class F-J Shares [Member] | ISQ Open Infrastructure Company LLC - Series II [Member]
Significant Accounting Policies [Line Items]
Percentage of distribution servicing fees	0.50%
Class F-DTE Shares [Member] | ISQ Open Infrastructure Company LLC - Series II [Member]
Significant Accounting Policies [Line Items]
Percentage of distribution servicing fees	0.25%
Investor Shares Member] | ISQ Open Infrastructure Company LLC - Series II [Member]
Significant Accounting Policies [Line Items]
Total Return attributable	12.50%