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Long-term debt - Schedule of Long-term Debt (Detail) | Dec. 31, 2023 USD ($) | Dec. 31, 2023 CAD ($) | Dec. 31, 2023 CLP ($) | Dec. 31, 2022 USD ($) | Jun. 30, 2021
--- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt | $ 8,516,030,000 |  |  | $ 7,512,017,000 |
Less: current portion | (621,856,000) |  |  | (423,274,000) |
Long-term debt, excluding current portion | $ 7,894,174,000 |  |  | 7,088,743,000 |
Senior Unsecured Notes | Senior unsecured notes (Green Equity Units) |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Weighted average coupon | 1.18% | 1.18% | 1.18% |  | 1.18%
Par value | $ 1,150,000,000 |  |  |  |
Long-term debt | $ 1,144,897,000 |  |  | 1,142,814,000 |
Senior Unsecured Notes | Senior unsecured notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Weighted average coupon | 3.36% | 3.36% | 3.36% |  |
Par value | $ 1,415,000,000 |  |  |  |
Long-term debt | $ 1,406,278,000 |  |  | 1,496,101,000 |
Senior Unsecured Notes | Senior unsecured utility notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Weighted average coupon | 6.30% | 6.30% | 6.30% |  |
Par value | $ 137,000,000 |  |  |  |
Long-term debt | $ 147,589,000 |  |  | 154,271,000 |
Senior Unsecured Notes | Senior secured utility bonds |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Weighted average coupon | 4.71% | 4.71% | 4.71% |  |
Par value | $ 556,199,000 |  |  |  |
Long-term debt | $ 551,166,000 |  |  | 554,822,000 |
Senior Unsecured Notes | Canadian dollar Senior unsecured notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Weighted average coupon | 3.68% | 3.68% | 3.68% |  |
Par value |  | $ 1,200,000,000 |  |  |
Long-term debt | $ 904,604,000 |  |  | 882,899,000 |
Senior Unsecured Notes | Senior secured project notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Weighted average coupon | 10.21% | 10.21% | 10.21% |  |
Par value |  | $ 16,848,000 |  |  |
Long-term debt | $ 12,738,000 |  |  | 15,024,000 |
Senior Unsecured Notes | Senior unsecured utility bonds |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Weighted average coupon | 3.90% | 3.90% | 3.90% |  |
Par value |  |  | $ 1,521,000 |  |
Long-term debt | $ 70,967,000 |  |  | 77,206,000 |
Senior Unsecured Notes | Senior Unsecured Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt | $ 7,131,107,000 |  |  | 5,855,566,000 |
Senior Unsecured Notes | 5.25%, U.S. Dollar Subordinated Unsecured Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Weighted average coupon | 5.25% | 5.25% | 5.25% |  |
Par value |  | $ 400,000,000 |  |  |
Long-term debt | $ 298,382,000 |  |  | 291,238,000 |
Senior Unsecured Notes | 5.56%, U.S. Dollar Subordinated Unsecured Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Weighted average coupon | 5.21% | 5.21% | 5.21% |  |
Par value | $ 1,100,000,000 |  |  |  |
Long-term debt | 1,086,541,000 |  |  | 1,365,213,000 |
Revolving Credit Facility | Senior Unsecured Notes | Senior unsecured revolving credit facilities |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt | 1,624,186,000 |  |  | 351,786,000 |
Revolving Credit Facility | Senior Unsecured Notes | Senior unsecured bank credit facilities and delayed draw term facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt | 786,962,000 |  |  | 773,643,000 |
Revolving Credit Facility | Senior Unsecured Notes | Commercial paper |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt | $ 481,720,000 |  |  | $ 407,000,000 |

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