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Debt and Capital Structure - Mandatory Debt Payments (Details)
$ in Millions, $ in Millions
Dec. 31, 2022
CAD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
CAD ($)
Dec. 31, 2021
USD ($)
Disclosure of detailed information about borrowings [line items]        
Total debt principal       $ 7,400
Long-Term Debt        
Disclosure of detailed information about borrowings [line items]        
Total debt principal $ 8,537   $ 12,113  
Total Debt Principal, (CAD equivalent) 8,537   12,113  
1 Year | Long-Term Debt        
Disclosure of detailed information about borrowings [line items]        
Total Debt Principal, (CAD equivalent) 0      
2024 | Long-Term Debt        
Disclosure of detailed information about borrowings [line items]        
Total Debt Principal, (CAD equivalent) 0      
2025 | Long-Term Debt        
Disclosure of detailed information about borrowings [line items]        
Total Debt Principal, (CAD equivalent) 181      
2026 | Long-Term Debt        
Disclosure of detailed information about borrowings [line items]        
Total Debt Principal, (CAD equivalent) 0      
5 Years | Long-Term Debt        
Disclosure of detailed information about borrowings [line items]        
Total Debt Principal, (CAD equivalent) 1,255      
Thereafter | Long-Term Debt        
Disclosure of detailed information about borrowings [line items]        
Total Debt Principal, (CAD equivalent) 7,101      
U.S. Dollar Denominated Unsecured Notes | Long-Term Debt        
Disclosure of detailed information about borrowings [line items]        
Total debt principal 6,537 $ 4,827 9,363 $ 7,385
Total Debt Principal, (CAD equivalent) 6,537   9,363  
U.S. Dollar Denominated Unsecured Notes | 1 Year | Long-Term Debt        
Disclosure of detailed information about borrowings [line items]        
Total debt principal   0    
Total Debt Principal, (CAD equivalent) 0      
U.S. Dollar Denominated Unsecured Notes | 2024 | Long-Term Debt        
Disclosure of detailed information about borrowings [line items]        
Total debt principal   0    
Total Debt Principal, (CAD equivalent) 0      
U.S. Dollar Denominated Unsecured Notes | 2025 | Long-Term Debt        
Disclosure of detailed information about borrowings [line items]        
Total debt principal   133    
Total Debt Principal, (CAD equivalent) 181      
U.S. Dollar Denominated Unsecured Notes | 2026 | Long-Term Debt        
Disclosure of detailed information about borrowings [line items]        
Total debt principal   0    
Total Debt Principal, (CAD equivalent) 0      
U.S. Dollar Denominated Unsecured Notes | 5 Years | Long-Term Debt        
Disclosure of detailed information about borrowings [line items]        
Total debt principal   373    
Total Debt Principal, (CAD equivalent) 505      
U.S. Dollar Denominated Unsecured Notes | Thereafter | Long-Term Debt        
Disclosure of detailed information about borrowings [line items]        
Total debt principal   $ 4,321    
Total Debt Principal, (CAD equivalent) 5,851      
Canadian Dollar Denominated Unsecured Notes | Long-Term Debt        
Disclosure of detailed information about borrowings [line items]        
Total debt principal 2,000   $ 2,750  
Total Debt Principal, (CAD equivalent) 2,000      
Canadian Dollar Denominated Unsecured Notes | 1 Year | 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) 0      
Canadian Dollar Denominated Unsecured Notes | 2026 | Long-Term Debt        
Disclosure of detailed information about borrowings [line items]        
Total Debt Principal, (CAD equivalent) 0      
Canadian Dollar Denominated Unsecured Notes | 5 Years | 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) $ 1,250