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Debt and Capital Structure - Mandatory Debt Payments (Details)
$ in Millions, $ in Millions
Dec. 31, 2021
CAD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
CAD ($)
Dec. 31, 2020
USD ($)
Disclosure of detailed information about borrowings [line items]        
Total debt principal   $ 7,400   $ 5,900
Long-Term Debt        
Disclosure of detailed information about borrowings [line items]        
Total debt principal $ 12,113 7,385 $ 7,510 5,898
Total Debt Principal, (CAD equivalent) 12,113   7,510  
2023 | Long-Term Debt        
Disclosure of detailed information about borrowings [line items]        
Total Debt Principal, (CAD equivalent) 146      
2024 | Long-Term Debt        
Disclosure of detailed information about borrowings [line items]        
Total Debt Principal, (CAD equivalent) 341      
2025 | Long-Term Debt        
Disclosure of detailed information about borrowings [line items]        
Total Debt Principal, (CAD equivalent) 1,594      
Thereafter | Long-Term Debt        
Disclosure of detailed information about borrowings [line items]        
Total Debt Principal, (CAD equivalent) 10,032      
U.S. Dollar Denominated Unsecured Notes | Long-Term Debt        
Disclosure of detailed information about borrowings [line items]        
Total debt principal 9,363 7,385 7,510 $ 5,898
Total Debt Principal, (CAD equivalent) 9,363   7,510  
U.S. Dollar Denominated Unsecured Notes | 2023 | Long-Term Debt        
Disclosure of detailed information about borrowings [line items]        
Total debt principal   115    
Total Debt Principal, (CAD equivalent) 146      
U.S. Dollar Denominated Unsecured Notes | 2024 | Long-Term Debt        
Disclosure of detailed information about borrowings [line items]        
Total debt principal   269    
Total Debt Principal, (CAD equivalent) 341      
U.S. Dollar Denominated Unsecured Notes | 2025 | Long-Term Debt        
Disclosure of detailed information about borrowings [line items]        
Total debt principal   666    
Total Debt Principal, (CAD equivalent) 844      
U.S. Dollar Denominated Unsecured Notes | Thereafter | Long-Term Debt        
Disclosure of detailed information about borrowings [line items]        
Total debt principal   $ 6,335    
Total Debt Principal, (CAD equivalent) 8,032      
Canadian Dollar Denominated Unsecured Notes | Long-Term Debt        
Disclosure of detailed information about borrowings [line items]        
Total debt principal 2,750   $ 0  
Total Debt Principal, (CAD equivalent) 2,750      
Canadian Dollar Denominated Unsecured Notes | 2023 | Long-Term Debt        
Disclosure of detailed information about borrowings [line items]        
Total Debt Principal, (CAD equivalent) 0      
Canadian Dollar Denominated Unsecured Notes | 2024 | Long-Term Debt        
Disclosure of detailed information about borrowings [line items]        
Total Debt Principal, (CAD equivalent) 0      
Canadian Dollar Denominated Unsecured Notes | 2025 | Long-Term Debt        
Disclosure of detailed information about borrowings [line items]        
Total Debt Principal, (CAD equivalent) 750      
Canadian Dollar Denominated Unsecured Notes | Thereafter | Long-Term Debt        
Disclosure of detailed information about borrowings [line items]        
Total Debt Principal, (CAD equivalent) $ 2,000