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Long-Term Debt - Narrative (Details)
 12 Months Ended
Dec. 31, 2023
CAD ($)
Dec. 31, 2022
CAD ($)
Dec. 31, 2022
GBP (£)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
CAD ($)
Dec. 31, 2023
USD ($)
Disclosure of detailed information about borrowings [line items]            
Repayment of bank credit facilities and commercial paper, net $ 0 $ 1,156,000,000     $ 6,151,000,000  
Letters of credit and guarantees outstanding 446,000,000 637,000,000        
Repayment of medium-term notes 416,000,000 1,498,000,000     0  
Repayment of long-term debt 0 0     $ 183,000,000  
Bank credit facilities            
Disclosure of detailed information about borrowings [line items]            
Maximum credit facility 5,450,000,000          
Demand credit facility            
Disclosure of detailed information about borrowings [line items]            
Maximum credit facility 100,000,000          
Demand credit facility | North Sea            
Disclosure of detailed information about borrowings [line items]            
Line of credit facility discontinued | £     £ 5,000,000      
Revolving Credit Facility Maturing February 2025            
Disclosure of detailed information about borrowings [line items]            
Maximum credit facility 500,000,000          
Revolving syndicated credit facility maturing June 2025            
Disclosure of detailed information about borrowings [line items]            
Maximum credit facility 2,425,000,000          
Revolving Syndicated Credit Facility Maturing June 2027            
Disclosure of detailed information about borrowings [line items]            
Maximum credit facility 2,425,000,000          
Non-revolving term credit facility maturing February 2023            
Disclosure of detailed information about borrowings [line items]            
Repayment of bank credit facilities and commercial paper, net   1,150,000,000        
Non-Revolving Term Credit Facility Maturing March 2022            
Disclosure of detailed information about borrowings [line items]            
Repayment of bank credit facilities and commercial paper, net   500,000,000        
Revolving Term Credit Facility Maturing February 2024            
Disclosure of detailed information about borrowings [line items]            
Maximum credit facility   $ 500,000,000        
Revolving Term Credit Facility Maturing February 2025            
Disclosure of detailed information about borrowings [line items]            
Maximum credit facility $ 500,000,000          
Commercial Paper            
Disclosure of detailed information about borrowings [line items]            
Maximum credit facility           $ 2,500,000,000
Long-term debt | Weighted average            
Disclosure of detailed information about borrowings [line items]            
Borrowings, interest rate 4.80% 4.30%       4.80%
Medium-term borrowings expiring August 2025            
Disclosure of detailed information about borrowings [line items]            
Base shell prospectus borrowings, authorized $ 3,000,000,000          
1.45% Medium-term Notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings, interest rate 1.45%         1.45%
Repayment of medium-term notes $ 405,000,000          
3.31% Medium-term Notes            
Disclosure of detailed information about borrowings [line items]            
Borrowings, interest rate   3.31%        
Repayment of medium-term notes   $ 1,000,000,000        
1.45% Medium-term Notes Due November 2023            
Disclosure of detailed information about borrowings [line items]            
Borrowings, interest rate   1.45%        
Repayment of medium-term notes   $ 95,000,000        
3.55% debentures due June 3, 2024            
Disclosure of detailed information about borrowings [line items]            
Borrowings, interest rate 3.55% 3.55%       3.55%
Repayment of medium-term notes   $ 169,000,000        
3.42% debentures due December 1, 2026            
Disclosure of detailed information about borrowings [line items]            
Borrowings, interest rate 3.42% 3.42%       3.42%
Repayment of medium-term notes   $ 159,000,000        
2.50% debentures due January 17, 2028            
Disclosure of detailed information about borrowings [line items]            
Borrowings, interest rate 2.50% 2.50%       2.50%
Repayment of medium-term notes   $ 75,000,000        
US dollar denominated debt, unsecured            
Disclosure of detailed information about borrowings [line items]            
Borrowings, interest rate   2.95%        
Base shell prospectus borrowings, authorized           $ 3,000,000,000
Repayment of long-term debt       $ 1,000,000,000