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Subsequent Events	12 Months Ended
Subsequent Events	Dec. 31, 2025
Subsequent Event [Line Items]
Subsequent Events	Subsequent Events The General Partner has performed an evaluation of subsequent events through the date the consolidated financial statements were issued and has determined that there were no subsequent events requiring adjustment or additional disclosure in the consolidated financial statements, except as noted below. Partial Repurchase of Class X Units Stonepeak Investment Holdings II LP received an offer for a partial repurchase of $25,000,000 of its ownership in Class X Units. The offer was accepted in January 2026. The number of Units repurchased is 789,421 equal to the repurchase amount divided by the NAV per Unit as of December 31, 2025. Amendment No. 1 to the Partnership Agreement The Partnership entered into Amendment No. 1 to the Partnership Agreement (the “Amendment No. 1”) with the General Partner, effective March 30, 2026. The Amendment No. 1 amended and restated Section 4.5(b) of the Partnership Agreement to expand and clarify the types of fees that the General Partner and its affiliates may receive in connection with the investment activities of Stonepeak and/or Portfolio Companies (each as defined in the Partnership Agreement) and from unconsummated transactions, including, among others, aviation and aviation-related fees. Amended and Restated Investment Advisory Agreement The Partnership entered into an Amended and Restated Investment Advisory Agreement (the “A&R Investment Advisory Agreement”) with the Investment Advisor, effective March 30, 2026. The A&R Investment Advisory Agreement (i) extends the period of the Investment Advisor’s advancement of organizational and offering expenses and Initial Partnership Expense Support from the first anniversary to the second anniversary of the Initial Closing Date, (ii) permits reimbursement by the Partnership to the Investment Advisor when and if requested by the Investment Advisor during the applicable 60-month period, and (iii) provides that aviation related fees and any fees or payments as agreed or approved by the Independent Directors are excluded from the Management Fee offset.
Stonepeak-Plus Infrastructure Fund Master Aggregator LP
Subsequent Event [Line Items]
Subsequent Events	Subsequent Events The General Partner has performed an evaluation of subsequent events through the date the consolidated financial statements were issued and has determined that there were no subsequent events requiring adjustment or additional disclosure in the consolidated financial statements, except as noted below. Second Amendment to the Credit Agreement On March 20, 2026, the Master Aggregator entered into the second amendment of the Credit Agreement which increased the principal amount to $300 million subject to the same customary conditions as the original Credit Agreement.