v3.26.3
Condensed Consolidated Statements of Changes in Net Assets (Unaudited) - BXINFRA Aggregator (CYM) L.P - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Investment Company, Net Assets [Roll Forward]        
Beginning balance $ 5,224,553 $ 2,014,693 $ 3,485,248 $ 100
Proceeds from Units Issued 817,474 603,377 2,182,198 2,617,692
Net Investment Income (Loss) 46,626 20,159 118,474 41,224
Distribution Reinvested 19,954 8,460 51,725 11,514
Redemption of Units (5,322)   (16,522) (198)
Ending balance 6,321,130 2,675,843 6,321,130 2,675,843
BXINFRA Aggregator (CYM) L.P.        
Investment Company, Net Assets [Roll Forward]        
Beginning balance 5,625,905 2,263,024 3,817,038 0
Proceeds from Units Issued 853,691 631,011 2,274,706 2,846,638
Net Investment Income (Loss) (46,305) (41) (110,922) 14,413
Distributions (49,618) (22,338) (126,822) (46,099)
Net Realized Gain (Loss) on Investments, Derivative Instruments and Translation of Assets and Liabilities in Foreign Currencies (1,248) (13,062) (3,572) (18,843)
Net Change in Unrealized Gain (Loss) on Investment in BXINFRA U.S. 391,582 94,947 960,574 159,143
Net Change in Unrealized Gain (Loss) on Derivative Instruments 12,431 15,050 12,146 3,078
Net Change in Unrealized Gain (Loss) on Translation of Assets and Liabilities in Foreign Currencies (12,548) (5,117) (32,170) 5,353
Redemption of Units (7,768) (464) (24,856) (673)
Ending balance 6,766,122 2,963,010 6,766,122 2,963,010
Series I Units        
Investment Company, Net Assets [Roll Forward]        
Beginning balance [1] 3,518,013 1,288,817 2,289,703 100
Proceeds from Units Issued [1] 586,629 376,191 1,556,438 1,635,069
Net Investment Income (Loss) [1] 31,337 12,594 78,636 25,691
Distribution Reinvested [1] 8,810 3,232 21,945 4,369
Redemption of Units [1] (2,013)   (8,583) (126)
Ending balance [1] 4,316,290 1,708,210 4,316,290 1,708,210
Series I Units | BXINFRA Aggregator (CYM) L.P.        
Investment Company, Net Assets [Roll Forward]        
Beginning balance [2] 5,625,905 2,263,024 3,817,038 0
Proceeds from Units Issued [2] 823,691 631,011 2,244,706 2,846,638
Net Investment Income (Loss) [2] (46,096) (41) (110,713) 14,413
Distributions [2] (49,388) (22,338) (126,592) (46,099)
Net Realized Gain (Loss) on Investments, Derivative Instruments and Translation of Assets and Liabilities in Foreign Currencies [2] (1,242) (13,062) (3,566) (18,843)
Net Change in Unrealized Gain (Loss) on Investment in BXINFRA U.S. [2] 389,710 94,947 958,702 159,143
Net Change in Unrealized Gain (Loss) on Derivative Instruments [2] 12,373 15,050 12,088 3,078
Net Change in Unrealized Gain (Loss) on Translation of Assets and Liabilities in Foreign Currencies [2] (12,493) (5,117) (32,115) 5,353
Redemption of Units [2] (7,768) (464) (24,856) (673)
Ending balance [2] 6,734,692 2,963,010 6,734,692 2,963,010
Series II Units        
Investment Company, Net Assets [Roll Forward]        
Beginning balance [1] 0 0 0 0
Proceeds from Units Issued [1] 30,000   30,000  
Net Investment Income (Loss) [1] 228   228  
Redemption of Units [1] 1   1  
Ending balance [1] 31,430 0 31,430 0
Series II Units | BXINFRA Aggregator (CYM) L.P.        
Investment Company, Net Assets [Roll Forward]        
Beginning balance [2] 0 0 0 0
Proceeds from Units Issued [2] 30,000   30,000  
Net Investment Income (Loss) [2] (209)   (209)  
Distributions [2] (230)   (230)  
Net Realized Gain (Loss) on Investments, Derivative Instruments and Translation of Assets and Liabilities in Foreign Currencies [2] (6)   (6)  
Net Change in Unrealized Gain (Loss) on Investment in BXINFRA U.S. [2] 1,872   1,872  
Net Change in Unrealized Gain (Loss) on Derivative Instruments [2] 58   58  
Net Change in Unrealized Gain (Loss) on Translation of Assets and Liabilities in Foreign Currencies [2] (55)   (55)  
Ending balance [2] 31,430 0 31,430 0
Series III Units        
Investment Company, Net Assets [Roll Forward]        
Beginning balance [1] 0 0 0 0
Ending balance [1] 0 0 0 0
Series III Units | BXINFRA Aggregator (CYM) L.P.        
Investment Company, Net Assets [Roll Forward]        
Beginning balance [2] 0 0 0 0
Ending balance [2] $ 0 $ 0 $ 0 $ 0
[1] On March 6, 2026, BXINFRA U.S. redesignated existing Class I Units as Class I-Series I Units and designated two new series of Class I Units, Class I-Series II Units and Class I-Series III Units.
[2] On March 6, 2026, the Aggregator redesignated existing Class A Units as Class I-Series I Units, designated two new series of Class I Units, Class I-Series II Units and Class I-Series III Units, and discontinued its Class B units.