Consolidated Statement of Assets and Liabilities	Dec. 31, 2025 USD ($) $ / shares shares
ISQ Open Infrastructure Company LLC - Series I
Assets
Investment at fair value	$ 35,601,783
Cash	7,000
Due from Manager - Expense Support	476,948
Deferred offering costs	173,197
Total Assets	36,258,928
Liabilities
Organizational costs payable	268,457
Offering costs payable	221,784
Professional fees payable	176,749
Total Liabilities	666,990
Commitments and Contingencies (Note 5)
Net Assets	35,591,938
ISQ Open Infrastructure Company LLC - Series II
Assets
Investment at fair value	183,179,945
Cash and cash equivalents	2,277,971
Due from Manager - Expense Support	4,360,335
Deferred offering costs	1,323,678
Prepaid expenses and other assets	158,043
Total Assets	191,299,972
Liabilities
Loan payable	10,510,000
Deferred tax liability	8,733,421
Performance participation allocation payable	3,415,609
Servicing fees payable	2,961,570
Organizational costs payable	2,559,348
Offering costs payable	1,734,837
Interest payable	1,694,183
Promissory Notes (net of debt issuance costs of $167,226)	690,774
Management fees payable	212,689
Professional fees payable	164,062
Accounts payable & accrued expenses	465,045
Total Liabilities	33,141,538
Commitments and Contingencies (Note 5)
Net Assets	158,158,434
F-STE Shares | ISQ Open Infrastructure Company LLC - Series I
Liabilities
Net Assets	$ 3,235,263
Net Asset Value Per Share
Shares outstanding (in Shares) | shares	107,654
Net asset value per share (in Dollars per share) | $ / shares	$ 30.05
F-STE Shares | ISQ Open Infrastructure Company LLC - Series II
Liabilities
Net Assets	$ 3,231,299
Net Asset Value Per Share
Shares outstanding (in Shares) | shares	105,792
Net asset value per share (in Dollars per share) | $ / shares	$ 30.54
F-DTE Shares | ISQ Open Infrastructure Company LLC - Series I
Liabilities
Net Assets	$ 12,853,300
Net Asset Value Per Share
Shares outstanding (in Shares) | shares	400,110
Net asset value per share (in Dollars per share) | $ / shares	$ 32.12
F-DTE Shares | ISQ Open Infrastructure Company LLC - Series II
Liabilities
Net Assets	$ 12,878,001
Net Asset Value Per Share
Shares outstanding (in Shares) | shares	400,100
Net asset value per share (in Dollars per share) | $ / shares	$ 32.19
F-ITE Shares | ISQ Open Infrastructure Company LLC - Series I
Liabilities
Net Assets	$ 1,319,365
Net Asset Value Per Share
Shares outstanding (in Shares) | shares	41,020
Net asset value per share (in Dollars per share) | $ / shares	$ 32.16
F-ITE Shares | ISQ Open Infrastructure Company LLC - Series II
Liabilities
Net Assets	$ 1,319,688
Net Asset Value Per Share
Shares outstanding (in Shares) | shares	40,677
Net asset value per share (in Dollars per share) | $ / shares	$ 32.44
F-JTE Shares | ISQ Open Infrastructure Company LLC - Series I
Liabilities
Net Assets	$ 18,167,268
Net Asset Value Per Share
Shares outstanding (in Shares) | shares	578,956
Net asset value per share (in Dollars per share) | $ / shares	$ 31.38
F-JTE Shares | ISQ Open Infrastructure Company LLC - Series II
Liabilities
Net Assets	$ 18,158,680
Net Asset Value Per Share
Shares outstanding (in Shares) | shares	572,307
Net asset value per share (in Dollars per share) | $ / shares	$ 31.73
STE Shares | ISQ Open Infrastructure Company LLC - Series I
Liabilities
Net Assets	$ 3,462
Net Asset Value Per Share
Shares outstanding (in Shares) | shares	110
Net asset value per share (in Dollars per share) | $ / shares	$ 31.47
STE Shares | ISQ Open Infrastructure Company LLC - Series II
Liabilities
Net Assets	$ 3,136
Net Asset Value Per Share
Shares outstanding (in Shares) | shares	100
Net asset value per share (in Dollars per share) | $ / shares	$ 31.36
DTE Shares | ISQ Open Infrastructure Company LLC - Series I
Liabilities
Net Assets	$ 3,537
Net Asset Value Per Share
Shares outstanding (in Shares) | shares	110
Net asset value per share (in Dollars per share) | $ / shares	$ 32.15
DTE Shares | ISQ Open Infrastructure Company LLC - Series II
Liabilities
Net Assets	$ 3,212
Net Asset Value Per Share
Shares outstanding (in Shares) | shares	100
Net asset value per share (in Dollars per share) | $ / shares	$ 32.12
ITE Shares | ISQ Open Infrastructure Company LLC - Series I
Liabilities
Net Assets	$ 3,568
Net Asset Value Per Share
Shares outstanding (in Shares) | shares	110
Net asset value per share (in Dollars per share) | $ / shares	$ 32.44
ITE Shares | ISQ Open Infrastructure Company LLC - Series II
Liabilities
Net Assets	$ 3,243
Net Asset Value Per Share
Shares outstanding (in Shares) | shares	100
Net asset value per share (in Dollars per share) | $ / shares	$ 32.43
JTE Shares | ISQ Open Infrastructure Company LLC - Series I
Liabilities
Net Assets	$ 3,506
Net Asset Value Per Share
Shares outstanding (in Shares) | shares	110
Net asset value per share (in Dollars per share) | $ / shares	$ 31.87
JTE Shares | ISQ Open Infrastructure Company LLC - Series II
Liabilities
Net Assets	$ 3,180
Net Asset Value Per Share
Shares outstanding (in Shares) | shares	100
Net asset value per share (in Dollars per share) | $ / shares	$ 31.8
ETE Shares | ISQ Open Infrastructure Company LLC - Series I
Liabilities
Net Assets	$ 2,669
Net Asset Value Per Share
Shares outstanding (in Shares) | shares	80
Net asset value per share (in Dollars per share) | $ / shares	$ 33.36
ETE Shares | ISQ Open Infrastructure Company LLC - Series II
Liabilities
Net Assets	$ 1,344
Net Asset Value Per Share
Shares outstanding (in Shares) | shares	40
Net asset value per share (in Dollars per share) | $ / shares	$ 33.6
E Shares | ISQ Open Infrastructure Company LLC - Series II
Liabilities
Net Assets	$ 12,685,360
Net Asset Value Per Share
Shares outstanding (in Shares) | shares	377,933
Net asset value per share (in Dollars per share) | $ / shares	$ 33.57
F-S Shares | ISQ Open Infrastructure Company LLC - Series II
Liabilities
Net Assets	$ 13,513,460
Net Asset Value Per Share
Shares outstanding (in Shares) | shares	448,694
Net asset value per share (in Dollars per share) | $ / shares	$ 30.12
F-I Shares | ISQ Open Infrastructure Company LLC - Series II
Liabilities
Net Assets	$ 6,660,049
Net Asset Value Per Share
Shares outstanding (in Shares) | shares	207,668
Net asset value per share (in Dollars per share) | $ / shares	$ 32.07
F-J Shares | ISQ Open Infrastructure Company LLC - Series II
Liabilities
Net Assets	$ 89,697,782
Net Asset Value Per Share
Shares outstanding (in Shares) | shares	2,862,789
Net asset value per share (in Dollars per share) | $ / shares	$ 31.33