v3.26.1
Cover - shares
3 Months Ended
Mar. 31, 2026
May 13, 2026
Cover [Abstract]    
Document Type 10-Q  
Document Period End Date Mar. 31, 2026  
Document Quarterly Report true  
Document Transition Report false  
Entity File Number 814-01654  
Entity Registrant Name North Haven Private Income Fund A LLC  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 92-1385301  
Entity Address, Address Line One 1585 Broadway  
Entity Address, City or Town New York  
Entity Address, State or Province NY  
Entity Address, Postal Zip Code 10036  
City Area Code 212  
Local Phone Number 761-4000  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company true  
Entity Ex Transition Period true  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   15,727,483
Entity Central Index Key 0001973476  
Amendment Flag false  
Document Fiscal Period Focus Q1  
Document Fiscal Year Focus 2026  
Current Fiscal Year End Date --12-31