1001 - Document - Cover Page link:presentationLink link:definitionLink link:calculationLink 1002 - Statement - Condensed Statements of Assets and Liabilities link:presentationLink link:definitionLink link:calculationLink 1003 - Statement - Condensed Statements of Assets and Liabilities (Parenthetical) link:presentationLink link:definitionLink link:calculationLink 1004 - Statement - Condensed Statement of Operations link:presentationLink link:definitionLink link:calculationLink 1005 - Statement - Condensed Statement of Changes in Net Assets link:presentationLink link:definitionLink link:calculationLink 1006 - Statement - Condensed Statements of Cash Flows link:presentationLink link:definitionLink link:calculationLink 1007 - Statement - Condensed Schedule of Investments link:presentationLink link:definitionLink link:calculationLink 1008 - Statement - Condensed Schedule of Investments Alternate link:presentationLink link:definitionLink link:calculationLink 1009 - Statement - Condensed Schedule of Investments (Parenthetical) link:presentationLink link:definitionLink link:calculationLink 1010 - Statement - Condensed Schedule of Investments (Parenthetical) Alternate link:presentationLink link:definitionLink link:calculationLink 999001 - Disclosure - Cybersecurity Risk Management and Strategy Disclosure link:presentationLink link:definitionLink link:calculationLink 999002 - Disclosure - Organization link:presentationLink link:definitionLink link:calculationLink 999003 - Disclosure - Summary of Significant Accounting Policies link:presentationLink link:definitionLink link:calculationLink 999004 - Disclosure - Investment in the Aggregator link:presentationLink link:definitionLink link:calculationLink 999005 - Disclosure - Investments and Fair Value Measurement link:presentationLink link:definitionLink link:calculationLink 999006 - Disclosure - Line of Credit Agreement link:presentationLink link:definitionLink link:calculationLink 999007 - Disclosure - Derivative Instruments link:presentationLink link:definitionLink link:calculationLink 999008 - Disclosure - Net Assets link:presentationLink link:definitionLink link:calculationLink 999009 - Disclosure - Repurchase Agreements link:presentationLink link:definitionLink link:calculationLink 999010 - Disclosure - Borrowings link:presentationLink link:definitionLink link:calculationLink 999011 - Disclosure - Related Party Transactions link:presentationLink link:definitionLink link:calculationLink 999012 - Disclosure - Commitments and Contingencies link:presentationLink link:definitionLink link:calculationLink 999013 - Disclosure - Income Taxes link:presentationLink link:definitionLink link:calculationLink 999014 - Disclosure - Warehousing Agreement link:presentationLink link:definitionLink link:calculationLink 999015 - Disclosure - Financial Highlights link:presentationLink link:definitionLink link:calculationLink 999016 - Disclosure - Subsequent Events link:presentationLink link:definitionLink link:calculationLink 999017 - Disclosure - Summary of Significant Accounting Policies (Policies) link:presentationLink link:definitionLink link:calculationLink 999018 - Disclosure - Investments and Fair Value Measurement (Tables) link:presentationLink link:definitionLink link:calculationLink 999019 - Disclosure - Derivative Instruments (Tables) link:presentationLink link:definitionLink link:calculationLink 999020 - Disclosure - Net Assets (Tables) link:presentationLink link:definitionLink link:calculationLink 999021 - Disclosure - Income Taxes (Tables) link:presentationLink link:definitionLink link:calculationLink 999022 - Disclosure - Repurchase Agreements (Tables) link:presentationLink link:definitionLink link:calculationLink 999023 - Disclosure - Financial Highlights (Tables) link:presentationLink link:definitionLink link:calculationLink 999024 - Disclosure - Organization - Additional Information (Detail) link:presentationLink link:definitionLink link:calculationLink 999025 - Disclosure - Investment in the Aggregator - Additional Information (Detail) link:presentationLink link:definitionLink link:calculationLink 999026 - Disclosure - Investments and Fair Value Measurement - Summary of Financial Information of Unconsolidated Significant Investments (Detail) link:presentationLink link:definitionLink link:calculationLink 999027 - Disclosure - Investments and Fair Value Measurement - Summary of Fair Value Measurement Inputs and Valuation Techniques (Detail) link:presentationLink link:definitionLink link:calculationLink 999028 - Disclosure - Investments and Fair Value Measurement - Summary of Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation (Detail) link:presentationLink link:definitionLink link:calculationLink 999029 - Disclosure - Investments and Fair Value Measurement - Summary of Tabular Form Of Fair Value Of Investments In Affiliates And Unfunded Commitment (Detail) link:presentationLink link:definitionLink link:calculationLink 999030 - Disclosure - Derivative Instruments - Summary of the Aggregate Notional Amount and Fair Value of the Derivative Financial Instruments (Detail) link:presentationLink link:definitionLink link:calculationLink 999031 - Disclosure - Derivative Instruments - Summary of the Impact to the Condensed Consolidated Statements of Operations from Derivative Financial Instruments (Detail) link:presentationLink link:definitionLink link:calculationLink 999032 - Disclosure - Repurchase Agreements - Schedule Of Underlying Assets Of Repurchase Agreements When Amount Of Repurchase Agreements Exceeds 10 Percent Of Assets (Detail) link:presentationLink link:definitionLink link:calculationLink 999033 - Disclosure - Repurchase Agreements - Schedule Of Recognized Liabilities For Repurchase Agreements (Detail) link:presentationLink link:definitionLink link:calculationLink 999034 - Disclosure - Repurchase Agreements - Additional Information (Detail) link:presentationLink link:definitionLink link:calculationLink 999035 - Disclosure - Line of Credit Agreement - Additional Information (Detail) link:presentationLink link:definitionLink link:calculationLink 999036 - Disclosure - Net Assets - Additional Information (Detail) link:presentationLink link:definitionLink link:calculationLink 999037 - Disclosure - Net Assets - Summary of the Units issued during the period (Detail) link:presentationLink link:definitionLink link:calculationLink 999038 - Disclosure - Net Assets - Summary of the Aggregate Distributions Declared and Payable (Detail) link:presentationLink link:definitionLink link:calculationLink 999039 - Disclosure - Borrowings - Additional Information (Detail) link:presentationLink link:definitionLink link:calculationLink 999040 - Disclosure - Related Party Transactions - Additional Information (Detail) link:presentationLink link:definitionLink link:calculationLink 999041 - Disclosure - Commitments and Contingencies - Additional Information (Detail) link:presentationLink link:definitionLink link:calculationLink 999042 - Disclosure - Income Taxes - Additional Information (Detail) link:presentationLink link:definitionLink link:calculationLink 999043 - Schedule - Income Taxes - Schedule of Aggregators Net Increase in Net Assets Resulting from Operations Before Provision for Taxes (Detail) link:presentationLink link:definitionLink link:calculationLink 999044 - Disclosure - Income Taxes - Schedule of Aggregator's Provision for Taxes (Detail) link:presentationLink link:definitionLink link:calculationLink 999045 - Disclosure - Income Taxes - Schedule of the Reconciles the Aggregator's Effective Income Tax Rate to the U.S.Federal Statutory Tax Rate (Detail) link:presentationLink link:definitionLink link:calculationLink 999046 - Disclosure - Income Taxes - Schedule of the Significant Components of the Company's Current Tax Assets and Liabilities (Detail) link:presentationLink link:definitionLink link:calculationLink 999047 - Disclosure - Income Taxes - Schedule of the Significant Components of the Aggregator's Deferred Tax Assets and Liabilities (Detail) link:presentationLink link:definitionLink link:calculationLink 999048 - Disclosure - Warehousing Agreement - Additional Information (Detail) link:presentationLink link:definitionLink link:calculationLink 999049 - Disclosure - Financial Highlights - Schedule of Capital Transactions and Differing Fee Arrangements (Detail) link:presentationLink link:definitionLink link:calculationLink 999050 - Disclosure - Financial Highlights - Schedule of Capital Transactions and Differing Fee Arrangements (Detail) (Parenthetical) link:presentationLink link:definitionLink link:calculationLink Cover [Abstract] Document Information [Table] Class of Stock [Axis] Class of Stock [Domain] Class S Limited Partnership Units [Member] Class S Limited Partnership Units [Member] Class S limited partnership units. Class D Limited Partnership Units [Member] Class D Limited Partnership Units [Member] Class D limited partnership units. Class I Limited Partnership Units [Member] Class I Limited Partnership Units [Member] Class I limited partnership units. Document Information [Line Items] Document Type Amendment Flag Document Period End Date Document Fiscal Year Focus Document Fiscal Period Focus Trading Symbol Entity Registrant Name Entity Central Index Key Current Fiscal Year End Date Entity Well-known Seasoned Issuer Entity Current Reporting Status Entity Filer Category Entity Emerging Growth Company Entity Small Business Document Transition Report Document Annual Report Title of 12(b) Security Security Exchange Name Entity Shell Company Entity Voluntary Filers Entity Interactive Data Current Entity File Number Entity Incorporation, State or Country Code Entity Tax Identification Number Entity Address, Address Line One Local Phone Number Entity Address, State or Province Entity Address, City or Town City Area Code Entity Address, Postal Zip Code Entity Public Float Entity Common Stock, Shares Outstanding Auditor Name Auditor Firm ID Auditor Location Document Financial Statement Error Correction [Flag] Entity Ex Transition Period Statement of Financial Position [Abstract] Statement [Table] Limited Partners' Capital Account by Class [Axis] Limited Partners' Capital Account, Class [Domain] Class S Units [Member] Class S Units [Member] Class S Units [Member] Class S units. Class D Units [Member] Class D Units [Member] Class D Units [Member] Class S units. Class I Units [Member] Class I Units [Member] Class I Units [Member] Class I units. Capital Unit, Class A [Member] Capital Unit, Class A [Member] Capital Unit, Class A [Member] Capital Unit, Class B [Member] Capital Unit, Class B [Member] Capital Unit, Class B [Member] Statement [Line Items] Assets [Abstract] Assets Cash and Cash Equivalents, at Carrying Value Cash and Cash Equivalents Assets Total Assets Investment Owned, Fair Value Investments at Fair Value Fair Value Fair Value Due from Affiliate Due from Affiliates Due from affiliate. Investments in Affiliates, Subsidiaries, Associates, and Joint Ventures, Fair Value Disclosure Investments in Affiliated Investee Funds Investee Funds Deferred Costs and Other Assets Deferred Assets Derivative Asset Derivative Assets at Fair Value Interest And Dividend Receivable And OtherAssets Interest and Dividend Receivable and Other Assets Interest and dividend receivable and other assets Redemptions Receivable Redemptions Receivable Redemptions receivable. Dividends Receivable Dividend Receivable Liabilities and Equity [Abstract] Liabilities and Equity Liabilities Total Liabilities Other Liabilities Due to Affiliates Accounts Payable and Other Accrued Liabilities Accounts Payable, Accrued Expenses, and Other Liabilities Servicing Fees Payable Servicing Fees Payable Servicing fees payable. Payable, Investment, Purchase Payable for Investments Purchased Other Accrued Liabilities Accrued Performance Participation Allocation Derivative Liability Derivative Liabilities at Fair Value Taxes Payable Taxes Payable Organization Costs Payable Organization Costs Payable Organization costs payable. Administration Fees Payable Administration Fees Payable Administration fees payable. Offering Costs Payable Offering Costs Payable Offering costs payable. Redemptions Payable Redemptions Payable Redemptions payable. Distribution Payable Distributions Payable Deferred Income Tax Liabilities, Net Deferred Tax Liabilities, Net Long-Term Line of Credit Credit Facilities Repurchase Agreements Repurchase agreements. Management Fee Payable Management Fee Payable Commitments and Contingencies Commitments and Contingencies Partners' Capital [Abstract] Net Assets Limited Partners' Capital Account Limited Partnership Unit General Partners' Capital Account General Partner Interest Partners' Capital Total Net Assets Liabilities and Equity Total Liabilities and Net Assets Legal Entity [Axis] Entity [Domain] BXINFRA Aggregator CYM LP [Member] BXINFRA Aggregator (CYM) L.P. [Member] BXINFRA Aggregator (CYM) L.P. [Member] BXINFRA Aggregator (CYM) L.P. Pledged Status [Axis] Pledged Status [Domain] Asset Pledged as Collateral [Member] Asset Not Pledged as Collateral [Member] Limited Partners' Capital Account, Description of Units Units authorized Limited Partners' Capital Account, Units Issued Units issued Limited Partners' Capital Account, Units Outstanding Units outstanding Beginning Units Outstanding Ending Units Outstanding Investment Owned, Cost Investment owned, cost Derivative Assets at Cost Derivative assets at cost Derivative assets at cost. Derivative Liabilities at Cost Derivative liabilities at cost Derivative liabilities at cost. Investment, Issuer Affiliation [Axis] Investment, Issuer Affiliation [Domain] Investment, Affiliated Issuer [Member] Income Statement [Abstract] Operating Expenses [Abstract] Expenses Professional Fees Professional Fees Noninterest Expense Directors Fees Directors' Fees Warehousing Fees Warehousing Fees Warehousing Fees. Other Expenses Other Investment Income, Investment Expense Total Expenses Warehousing Fees Waived Warehousing Fees Waived Warehousing fees waived. Operating Expenses Net Expenses Management Fee Expense Management Fees Management fee expense Organizational Expenses Organizational Expenses Organizational expenses. Labor and Related Expense Performance Participation Allocation Deferred Offering Costs Amortization Deferred Offering Costs Amortization Deferred offering costs amortization. General and Administrative Expense Administration Fees Investment Company, Contractual Fee Waived Management Fees Waived Expense Support Expense Support Expense support. Interest Expense, Operating Interest Expense Deferred Financing Cost Amortization Deferred Financing Cost Amortization Deferred financing cost amortization. Gain (Loss), Investment and Derivative, Operating, and Foreign Currency Transaction, before Tax [Abstract] Net Realized and Unrealized Gain (Loss) on Investments, Derivative Instruments and Translation of Assets and Liabilities in Foreign Currencies Unrealized Gain (Loss), Investment, Derivative, and Foreign Currency Transaction, Operating, after Tax Net Change in Unrealized Gain (Loss) on Investment in the Aggregator Net Increase in Net Assets Resulting from Operations Net Increase in Net Assets Resulting from Operations Unrealized Gain (Loss) on Investments Net Change in Unrealized Gain (Loss) on Investments Unrealized Gain (Loss) on Derivatives Net Change in Unrealized Gain (Loss) on Derivative Instruments Realized Gain (Loss), Foreign Currency Transaction, Excluding Investment Price Change, before Tax Net Change in Unrealized Gain (Loss) on Translation of Assets and Liabilities in Foreign Currencies Net Change in Unrealized Gain (Loss) on Translation of Assets and Liabilities in Foreign Currencies Gain (Loss), Investment and Derivative, Operating, and Foreign Currency Transaction, before Tax Net Realized and Unrealized Gain (Loss) on Investments, Derivative Instruments and Translation of Assets and Liabilities in Foreign Currencies Realized Gain (Loss), Investment and Derivative, Operating, after Tax Net Realized Loss on Investments, Derivative Instruments, and Translation of Assets and Liabilities in Foreign Currencies Net Realized Loss on Investments, Derivative Instruments, and Translation of Assets and Liabilities in Foreign Currencies Investment Income, Net [Abstract] Income Investment Income, Interest Interest Income Other Income Other Gross Investment Income, Operating Total Income Dividend Income, Operating Dividend Income Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Net Investment Income Before Provision for Taxes Income Tax Expense (Benefit) Provision for Taxes Income tax expense (benefit) Provision for Taxes Investment Income, Net Net Investment Income Net Investment Income Investment Company, Net Assets [Roll Forward] Investment Company, Change in Net Assets [Table] Capital Units by Class [Axis] Capital Unit, Class [Domain] General Partner Interest [Member] General Partner Interest [Member] General partner interest. Class A Units [Member] Class A Units [Member] Class B Units [Member] Class B Units [Member] Class B units. Investment Company, Change in Net Assets [Line Items] Net Assets Beginning balance Ending balance Stock Issued During Period, Value, New Issues Proceeds from Units Issued Servicing Fees Servicing Fees Servicing fees. IncreaseDecreaseInUnrealizedGainLossOnDerivativeInstruments Net Change in Unrealized Gain (Loss) on Derivative Instruments Net Change in Unrealized (Gain) Loss on Derivative Instruments Increase decrease in unrealized gain loss on derivative instruments Realized Investment Gains (Losses) Net Realized Gain on Investments, Derivative Instruments and Translation of Assets and Liabilities in Foreign Currencies Repurchase Of Units Net Of Early Repurchase Deduction Redemption of Units, Net of Early Redemption Deduction Repurchase of units net of early repurchase deduction. Distributions Distributions Distributions of units. Distributions on Mandatorily Redeemable Securities Distributions Stock Issued During Period, Value, Conversion of Units Conversion of Units Between Classes Distributions Reinvested Distributions Reinvested Distributions reinvested. Statement of Cash Flows [Abstract]