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Long-term debt - Schedule of Long-term Debt (Detail)
Jun. 30, 2023
USD ($)
Jun. 30, 2023
CAD ($)
Jun. 30, 2023
CLP ($)
Dec. 31, 2022
USD ($)
Debt Instrument [Line Items]        
Long-term debt $ 8,083,147,000     $ 7,512,017,000
Less: current portion (513,803,000)     (423,274,000)
Long-term debt, excluding current portion 7,569,344,000     7,088,743,000
Senior Unsecured Notes        
Debt Instrument [Line Items]        
Long-term debt $ 1,663,373,000     1,656,451,000
Senior Unsecured Notes | U.S. Dollar Senior Unsecured Notes (Green Equity Units)        
Debt Instrument [Line Items]        
Weighted average coupon 1.18% 1.18% 1.18%  
Par value $ 1,150,000,000      
Long-term debt $ 1,143,856,000     1,142,814,000
Senior Unsecured Notes | Senior unsecured notes        
Debt Instrument [Line Items]        
Weighted average coupon 3.38% 3.38% 3.38%  
Par value $ 1,490,000,000      
Long-term debt $ 1,481,682,000     1,496,101,000
Senior Unsecured Notes | Senior unsecured utility notes        
Debt Instrument [Line Items]        
Weighted average coupon 6.34% 6.34% 6.34%  
Par value $ 142,000,000      
Long-term debt $ 153,435,000     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 $ 556,203,000      
Long-term debt $ 552,479,000     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 $ 903,360,000     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   $ 18,512,000    
Long-term debt $ 13,982,000     15,024,000
Senior Unsecured Notes | Senior unsecured utility bonds        
Debt Instrument [Line Items]        
Weighted average coupon 3.98% 3.98% 3.98%  
Par value     $ 1,579,000  
Long-term debt $ 81,532,000     77,206,000
Senior Unsecured Notes | Senior Unsecured Debt        
Debt Instrument [Line Items]        
Long-term debt $ 6,419,774,000     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 $ 298,033,000     291,238,000
Senior Unsecured Notes | 5.56%, U.S. Dollar Subordinated Unsecured Notes        
Debt Instrument [Line Items]        
Weighted average coupon 5.56% 5.56% 5.56%  
Par value $ 1,387,500,000      
Long-term debt 1,365,340,000     1,365,213,000
Revolving Credit Facility | Senior Unsecured Notes | Senior unsecured revolving credit facilities        
Debt Instrument [Line Items]        
Long-term debt 801,929,000     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 788,906,000     773,643,000
Revolving Credit Facility | Senior Unsecured Notes | Commercial paper        
Debt Instrument [Line Items]        
Long-term debt $ 498,613,000     $ 407,000,000