Financial Highlights - Schedule of Capital Transactions and Differing Fee Arrangements (Detail) - $ / shares
|
9 Months Ended |
Sep. 30, 2026 |
Sep. 30, 2025 |
| Investment Company, Financial Highlights [Roll Forward] |
|
|
| Net Asset Value, End of Period (in dollars per share) |
$ 25.00
|
|
| Series I Units |
|
|
| Investment Company, Financial Highlights [Roll Forward] |
|
|
| Net Asset Value, Beginning of Period (in dollars per share) |
27.54
|
$ 0
|
| Proceeds from Units Issued (in dollars per share) |
0
|
25.00
|
| Net Investment Income (Loss) (in dollars per share) |
0.66
|
0.47
|
| Net Change in Unrealized Gain (Loss) on Investment in BXINFRA U.S. (in dollars per share) |
3.85
|
1.55
|
| Net Increase in Net Assets Resulting from Investment Operations (in dollars per share) |
4.52
|
2.02
|
| Distributions (in dollars per share) |
(0.67)
|
(0.50)
|
| Servicing Fees (in dollars per share) |
0
|
0
|
| Net Increase in Net Assets (in dollars per share) |
3.85
|
1.53
|
| Net Asset Value, End of Period (in dollars per share) |
$ 31.39
|
$ 26.53
|
| Units outstanding, end of period (in shares) |
137,502,712
|
64,395,784
|
| Total Return Based on Net Asset Value |
16.40%
|
6.11%
|
| Ratios to Weighted-Average Net Assets (Non-Annualized) |
|
|
| Total Expenses |
0.05%
|
0.07%
|
| Net Investment Income (Loss) |
4.71%
|
2.91%
|
| Warehousing Fees Waivers |
(0.09%)
|
(0.64%)
|
| Expenses without waivers |
0.15%
|
0.71%
|
| Series II Units |
|
|
| Investment Company, Financial Highlights [Roll Forward] |
|
|
| Net Asset Value, Beginning of Period (in dollars per share) |
$ 0
|
|
| Proceeds from Units Issued (in dollars per share) |
29.99
|
|
| Net Investment Income (Loss) (in dollars per share) |
0.23
|
|
| Net Change in Unrealized Gain (Loss) on Investment in BXINFRA U.S. (in dollars per share) |
1.43
|
|
| Net Increase in Net Assets Resulting from Investment Operations (in dollars per share) |
1.66
|
|
| Distributions (in dollars per share) |
(0.23)
|
|
| Servicing Fees (in dollars per share) |
0
|
|
| Net Increase in Net Assets (in dollars per share) |
1.43
|
|
| Net Asset Value, End of Period (in dollars per share) |
$ 31.42
|
|
| Units outstanding, end of period (in shares) |
1,000,293
|
|
| Total Return Based on Net Asset Value |
5.53%
|
|
| Ratios to Weighted-Average Net Assets (Non-Annualized) |
|
|
| Total Expenses |
0.04%
|
|
| Net Investment Income (Loss) |
4.42%
|
|
| Warehousing Fees Waivers |
(0.08%)
|
|
| Expenses without waivers |
0.13%
|
|
| Class S Units |
|
|
| Investment Company, Financial Highlights [Roll Forward] |
|
|
| Net Asset Value, Beginning of Period (in dollars per share) |
$ 25.74
|
$ 0
|
| Proceeds from Units Issued (in dollars per share) |
0
|
25.00
|
| Net Investment Income (Loss) (in dollars per share) |
0.65
|
0.47
|
| Net Change in Unrealized Gain (Loss) on Investment in BXINFRA U.S. (in dollars per share) |
3.80
|
1.54
|
| Net Increase in Net Assets Resulting from Investment Operations (in dollars per share) |
4.46
|
2.01
|
| Distributions (in dollars per share) |
(0.67)
|
(0.50)
|
| Servicing Fees (in dollars per share) |
(0.20)
|
(1.74)
|
| Net Increase in Net Assets (in dollars per share) |
3.60
|
(0.22)
|
| Net Asset Value, End of Period (in dollars per share) |
$ 29.34
|
$ 24.78
|
| Units outstanding, end of period (in shares) |
60,245,939
|
35,465,856
|
| Total Return Based on Net Asset Value |
16.57%
|
(0.88%)
|
| Ratios to Weighted-Average Net Assets (Non-Annualized) |
|
|
| Total Expenses |
0.05%
|
0.07%
|
| Net Investment Income (Loss) |
4.70%
|
2.91%
|
| Warehousing Fees Waivers |
(0.10%)
|
(0.64%)
|
| Expenses without waivers |
0.15%
|
0.71%
|
| Class D Units |
|
|
| Investment Company, Financial Highlights [Roll Forward] |
|
|
| Net Asset Value, Beginning of Period (in dollars per share) |
$ 26.99
|
$ 0
|
| Proceeds from Units Issued (in dollars per share) |
0
|
25.00
|
| Net Investment Income (Loss) (in dollars per share) |
0.66
|
0.47
|
| Net Change in Unrealized Gain (Loss) on Investment in BXINFRA U.S. (in dollars per share) |
3.83
|
1.54
|
| Net Increase in Net Assets Resulting from Investment Operations (in dollars per share) |
4.50
|
2.01
|
| Distributions (in dollars per share) |
(0.67)
|
(0.50)
|
| Servicing Fees (in dollars per share) |
(0.06)
|
(0.52)
|
| Net Increase in Net Assets (in dollars per share) |
3.77
|
1.00
|
| Net Asset Value, End of Period (in dollars per share) |
$ 30.76
|
$ 26.00
|
| Units outstanding, end of period (in shares) |
6,690,323
|
3,404,568
|
| Total Return Based on Net Asset Value |
16.45%
|
3.99%
|
| Ratios to Weighted-Average Net Assets (Non-Annualized) |
|
|
| Total Expenses |
0.05%
|
0.07%
|
| Net Investment Income (Loss) |
4.76%
|
2.97%
|
| Warehousing Fees Waivers |
(0.10%)
|
(0.65%)
|
| Expenses without waivers |
0.15%
|
0.72%
|
| Class S- TE-ACC Units |
|
|
| Investment Company, Financial Highlights [Roll Forward] |
|
|
| Net Asset Value, Beginning of Period (in dollars per share) |
$ 25.58
|
|
| Proceeds from Units Issued (in dollars per share) |
0
|
|
| Net Investment Income (Loss) (in dollars per share) |
0.92
|
|
| Net Change in Unrealized Gain (Loss) on Investment in BXINFRA U.S. (in dollars per share) |
3.37
|
|
| Net Increase in Net Assets Resulting from Investment Operations (in dollars per share) |
4.29
|
|
| Servicing Fees (in dollars per share) |
(0.27)
|
|
| Net Increase in Net Assets (in dollars per share) |
4.02
|
|
| Net Asset Value, End of Period (in dollars per share) |
$ 29.60
|
|
| Units outstanding, end of period (in shares) |
4,917,244
|
|
| Total Return Based on Net Asset Value |
15.71%
|
|
| Ratios to Weighted-Average Net Assets (Non-Annualized) |
|
|
| Total Expenses |
0.03%
|
|
| Net Investment Income (Loss) |
1.95%
|
|
| Class S-TE Units |
|
|
| Investment Company, Financial Highlights [Roll Forward] |
|
|
| Net Asset Value, Beginning of Period (in dollars per share) |
|
$ 0
|
| Proceeds from Units Issued (in dollars per share) |
|
25.00
|
| Net Investment Income (Loss) (in dollars per share) |
|
0.92
|
| Net Change in Unrealized Gain (Loss) on Investment in BXINFRA U.S. (in dollars per share) |
|
0.91
|
| Net Increase in Net Assets Resulting from Investment Operations (in dollars per share) |
|
1.83
|
| Distributions (in dollars per share) |
|
(0.49)
|
| Servicing Fees (in dollars per share) |
|
(1.72)
|
| Net Increase in Net Assets (in dollars per share) |
|
(0.38)
|
| Net Asset Value, End of Period (in dollars per share) |
|
$ 24.62
|
| Units outstanding, end of period (in shares) |
|
12,407,234
|
| Total Return Based on Net Asset Value |
|
(1.52%)
|
| Ratios to Weighted-Average Net Assets (Non-Annualized) |
|
|
| Total Expenses |
|
0.03%
|
| Net Investment Income (Loss) |
|
1.70%
|
| Blackstone Infrastructure Strategies (TE) L.P. |
|
|
| Investment Company, Financial Highlights [Roll Forward] |
|
|
| Net Asset Value, End of Period (in dollars per share) |
$ 25.00
|
|
| Blackstone Infrastructure Strategies (TE) L.P. | Series I Units |
|
|
| Investment Company, Financial Highlights [Roll Forward] |
|
|
| Net Asset Value, Beginning of Period (in dollars per share) |
27.28
|
|
| Proceeds from Units Issued (in dollars per share) |
0
|
|
| Net Investment Income (Loss) (in dollars per share) |
0.92
|
|
| Net Change in Unrealized Gain (Loss) on Investment in BXINFRA U.S. (in dollars per share) |
3.35
|
|
| Net Increase in Net Assets Resulting from Investment Operations (in dollars per share) |
4.28
|
|
| Distributions (in dollars per share) |
(0.66)
|
|
| Servicing Fees (in dollars per share) |
0
|
|
| Net Increase in Net Assets (in dollars per share) |
3.62
|
|
| Net Asset Value, End of Period (in dollars per share) |
$ 30.90
|
|
| Units outstanding, end of period (in shares) |
27,960,346
|
|
| Total Return Based on Net Asset Value |
15.69%
|
|
| Ratios to Weighted-Average Net Assets (Non-Annualized) |
|
|
| Total Expenses |
0.03%
|
|
| Net Investment Income (Loss) |
1.83%
|
|
| Blackstone Infrastructure Strategies (TE) L.P. | Class S Units |
|
|
| Investment Company, Financial Highlights [Roll Forward] |
|
|
| Net Asset Value, Beginning of Period (in dollars per share) |
$ 25.50
|
|
| Proceeds from Units Issued (in dollars per share) |
0
|
|
| Net Investment Income (Loss) (in dollars per share) |
0.91
|
|
| Net Change in Unrealized Gain (Loss) on Investment in BXINFRA U.S. (in dollars per share) |
3.32
|
|
| Net Increase in Net Assets Resulting from Investment Operations (in dollars per share) |
4.23
|
|
| Distributions (in dollars per share) |
(0.66)
|
|
| Servicing Fees (in dollars per share) |
(0.19)
|
|
| Net Increase in Net Assets (in dollars per share) |
3.38
|
|
| Net Asset Value, End of Period (in dollars per share) |
$ 28.88
|
|
| Units outstanding, end of period (in shares) |
21,715,564
|
|
| Total Return Based on Net Asset Value |
15.86%
|
|
| Ratios to Weighted-Average Net Assets (Non-Annualized) |
|
|
| Total Expenses |
0.03%
|
|
| Net Investment Income (Loss) |
1.86%
|
|
| Blackstone Infrastructure Strategies (TE) L.P. | Class I- TE-ACC Units |
|
|
| Investment Company, Financial Highlights [Roll Forward] |
|
|
| Net Asset Value, Beginning of Period (in dollars per share) |
$ 27.43
|
$ 0
|
| Proceeds from Units Issued (in dollars per share) |
0
|
25.00
|
| Net Investment Income (Loss) (in dollars per share) |
0.93
|
0.72
|
| Net Change in Unrealized Gain (Loss) on Investment in BXINFRA U.S. (in dollars per share) |
3.40
|
0.56
|
| Net Increase in Net Assets Resulting from Investment Operations (in dollars per share) |
4.34
|
1.28
|
| Servicing Fees (in dollars per share) |
0
|
0
|
| Net Increase in Net Assets (in dollars per share) |
4.34
|
1.28
|
| Net Asset Value, End of Period (in dollars per share) |
$ 31.77
|
$ 26.28
|
| Units outstanding, end of period (in shares) |
3,220,869
|
769,403
|
| Total Return Based on Net Asset Value |
15.81%
|
5.14%
|
| Ratios to Weighted-Average Net Assets (Non-Annualized) |
|
|
| Total Expenses |
0.03%
|
0.02%
|
| Net Investment Income (Loss) |
2.16%
|
2.75%
|
| Blackstone Infrastructure Strategies (TE) L.P. | Class S- TE-ACC Units |
|
|
| Investment Company, Financial Highlights [Roll Forward] |
|
|
| Net Asset Value, Beginning of Period (in dollars per share) |
|
$ 0
|
| Proceeds from Units Issued (in dollars per share) |
|
25.00
|
| Net Investment Income (Loss) (in dollars per share) |
|
0.76
|
| Net Change in Unrealized Gain (Loss) on Investment in BXINFRA U.S. (in dollars per share) |
|
0.52
|
| Net Increase in Net Assets Resulting from Investment Operations (in dollars per share) |
|
1.28
|
| Servicing Fees (in dollars per share) |
|
(1.78)
|
| Net Increase in Net Assets (in dollars per share) |
|
(0.50)
|
| Net Asset Value, End of Period (in dollars per share) |
|
$ 24.50
|
| Units outstanding, end of period (in shares) |
|
1,516,957
|
| Total Return Based on Net Asset Value |
|
(1.99%)
|
| Ratios to Weighted-Average Net Assets (Non-Annualized) |
|
|
| Total Expenses |
|
0.02%
|
| Net Investment Income (Loss) |
|
2.17%
|
| Blackstone Infrastructure Strategies (TE) L.P. | Class I-TE Units |
|
|
| Investment Company, Financial Highlights [Roll Forward] |
|
|
| Net Asset Value, Beginning of Period (in dollars per share) |
|
$ 0
|
| Proceeds from Units Issued (in dollars per share) |
|
25.00
|
| Net Investment Income (Loss) (in dollars per share) |
|
0.92
|
| Net Change in Unrealized Gain (Loss) on Investment in BXINFRA U.S. (in dollars per share) |
|
0.92
|
| Net Increase in Net Assets Resulting from Investment Operations (in dollars per share) |
|
1.84
|
| Distributions (in dollars per share) |
|
(0.49)
|
| Servicing Fees (in dollars per share) |
|
0
|
| Net Increase in Net Assets (in dollars per share) |
|
1.34
|
| Net Asset Value, End of Period (in dollars per share) |
|
$ 26.34
|
| Units outstanding, end of period (in shares) |
|
13,128,392
|
| Total Return Based on Net Asset Value |
|
5.38%
|
| Ratios to Weighted-Average Net Assets (Non-Annualized) |
|
|
| Total Expenses |
|
0.03%
|
| Net Investment Income (Loss) |
|
1.66%
|
| BXINFRA Aggregator (CYM) L.P. |
|
|
| Investment Company, Financial Highlights [Roll Forward] |
|
|
| Net Asset Value, End of Period (in dollars per share) |
$ 25.00
|
|
| BXINFRA Aggregator (CYM) L.P. | Series I Units |
|
|
| Investment Company, Financial Highlights [Roll Forward] |
|
|
| Net Asset Value, Beginning of Period (in dollars per share) |
27.55
|
$ 0
|
| Proceeds from Units Issued (in dollars per share) |
0
|
25.00
|
| Net Investment Income (Loss) (in dollars per share) |
(0.61)
|
0.23
|
| Net Change in Unrealized Gain (Loss) on Investment in BXINFRA U.S. (in dollars per share) |
5.12
|
1.80
|
| Distributions (in dollars per share) |
(0.67)
|
(0.50)
|
| Net Increase in Net Assets (in dollars per share) |
4.51
|
2.03
|
| Net Asset Value, End of Period (in dollars per share) |
$ 31.39
|
$ 26.53
|
| Units outstanding, end of period (in shares) |
214,497,433
|
111,674,297
|
| Total Return Based on Net Asset Value |
16.38%
|
6.13%
|
| Ratios to Weighted-Average Net Assets (Non-Annualized) |
|
|
| Total Expenses |
2.51%
|
2.52%
|
| Net Investment Income (Loss) |
(2.10%)
|
0.71%
|
| Expenses without waivers |
1.57%
|
1.87%
|
| Expense Support and Management Fees Waivers |
0.00%
|
(0.56%)
|
| Accrued Performance Participation Allocation |
0.94%
|
1.21%
|
| BXINFRA Aggregator (CYM) L.P. | Series II Units |
|
|
| Investment Company, Financial Highlights [Roll Forward] |
|
|
| Net Asset Value, Beginning of Period (in dollars per share) |
$ 0
|
|
| Proceeds from Units Issued (in dollars per share) |
30.00
|
|
| Net Investment Income (Loss) (in dollars per share) |
(0.20)
|
|
| Net Change in Unrealized Gain (Loss) on Investment in BXINFRA U.S. (in dollars per share) |
1.86
|
|
| Distributions (in dollars per share) |
(0.23)
|
|
| Net Increase in Net Assets (in dollars per share) |
1.66
|
|
| Net Asset Value, End of Period (in dollars per share) |
$ 31.43
|
|
| Units outstanding, end of period (in shares) |
999,953
|
|
| Total Return Based on Net Asset Value |
5.53%
|
|
| Ratios to Weighted-Average Net Assets (Non-Annualized) |
|
|
| Total Expenses |
1.26%
|
|
| Net Investment Income (Loss) |
(0.69%)
|
|
| Expenses without waivers |
0.47%
|
|
| Expense Support and Management Fees Waivers |
0.00%
|
|
| Accrued Performance Participation Allocation |
0.79%
|
|