v3.26.1
Cover
Apr. 29, 2026
Cover [Abstract]  
Document Type 8-K
Amendment Flag false
Document Period End Date Apr. 29, 2026
Entity File Number 000-56735
Entity Registrant Name ISQ Open Infrastructure Co LLC
Entity Central Index Key 0002059924
Entity Tax Identification Number 33-2876284
Entity Incorporation, State or Country Code DE
Entity Address, Address Line One 600 Brickell Avenue
Entity Address, Address Line Two PH
Entity Address, City or Town Miami
Entity Address, State or Province FL
Entity Address, Postal Zip Code 33131
City Area Code 786
Local Phone Number 693-5700
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Entity Emerging Growth Company true
Elected Not To Use the Extended Transition Period false