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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