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Commitment and Contingencies (Details)
8 Months Ended 12 Months Ended
Dec. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2025
EUR (€)
Jul. 22, 2025
USD ($)
Nov. 23, 2024
EUR (€)
Other Commitments [Line Items]              
Organization expenses   $ 2,627,988 $ 3,973,349 $ 2,627,988 [1]      
Deferred offering costs $ 483,481 $ 0 [2] 483,481 $ 0 [2]      
Stonepeak-Plus Infrastructure Fund Master Aggregator LP              
Other Commitments [Line Items]              
Organization expenses 203,252            
Credit facility payable 80,000,000   80,000,000        
Stonepeak-Plus Infrastructure Fund Master Aggregator LP | Affiliated investee funds              
Other Commitments [Line Items]              
Commitments     351,186,699        
Unfunded commitment 91,842,485   91,842,485        
Stonepeak-Plus Infrastructure Fund Master Aggregator LP | Other Affiliated Investments              
Other Commitments [Line Items]              
Commitments     330,000,000        
Unfunded commitment 150,051,532   150,051,532        
Stonepeak-Plus Infrastructure Fund Master Aggregator LP | Secured Debt              
Other Commitments [Line Items]              
Debt instrument, face amount | €             € 160,000,000
Amount outstanding | €         € 177,078,801    
Stonepeak-Plus Infrastructure Fund Master Aggregator LP | Affiliated Entity              
Other Commitments [Line Items]              
Credit facility payable 225,900,000   225,900,000        
Stonepeak-Plus Infrastructure Fund Master Aggregator LP | Affiliated Entity | Secured Debt              
Other Commitments [Line Items]              
Line of credit, maximum borrowing capacity           $ 240,000,000  
Stonepeak-Plus Infrastructure Fund Master Aggregator LP | Affiliated Entity | Secured Debt | Letter of Credit              
Other Commitments [Line Items]              
Line of credit, maximum borrowing capacity           $ 21,900,000  
Stonepeak-Plus Infrastructure Fund Master Aggregator LP | Affiliated Entity | Investment Advisory Agreement, SP+ INFRA Organizational And Offering Expenses              
Other Commitments [Line Items]              
Organization and offering expenses     203,252        
Deferred offering costs $ 0   $ 0        
[1] For the period from April 29, 2024 (Inception) through December 31, 2024. The financial statements were not consolidated.
[2] The financial statements were not consolidated as of December 31, 2024.