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Long-Term Debt - Narrative (Details)
 12 Months Ended
Dec. 31, 2022
CAD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2022
GBP (£)
Dec. 31, 2021
CAD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
CAD ($)
Dec. 31, 2022
USD ($)
Mar. 31, 2022
CAD ($)
Dec. 31, 2021
USD ($)
Disclosure of detailed information about borrowings [line items]                  
(Repayment) issue of bank credit facilities and commercial paper, net $ (1,156,000,000)     $ (6,151,000,000)   $ 338,000,000      
Borrowings 11,445,000,000     14,694,000,000          
Letters of credit and guarantees outstanding 637,000,000     513,000,000          
Repayment of medium-term notes (1,498,000,000)     0   (1,100,000,000)      
Repayment of long-term debt 0     183,000,000   397,000,000      
Bank credit facilities                  
Disclosure of detailed information about borrowings [line items]                  
Maximum credit facility 5,520,000,000                
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 2024                  
Disclosure of detailed information about borrowings [line items]                  
Maximum credit facility 500,000,000                
Revolving syndicated credit facility maturing June 2024                  
Disclosure of detailed information about borrowings [line items]                  
Maximum credit facility 2,425,000,000                
Maximum borrowing capacity, term extended       2,425,000,000          
Maximum borrowing capacity increased       70,000,000          
Revolving Syndicated Credit Facility Maturing June 2023 And June 2025                  
Disclosure of detailed information about borrowings [line items]                  
Maximum credit facility 2,495,000,000                
Revolving syndicated credit facility maturing June 2023                  
Disclosure of detailed information about borrowings [line items]                  
Maximum credit facility 70,000,000                
Maximum borrowing capacity not extended       70,000,000          
Non-revolving term credit facility maturing February 2023                  
Disclosure of detailed information about borrowings [line items]                  
Maximum credit facility       2,650,000,000          
(Repayment) issue of bank credit facilities and commercial paper, net 1,150,000,000     1,500,000,000          
Borrowings       1,150,000,000          
Revolving syndicated credit facility maturing June 2025                  
Disclosure of detailed information about borrowings [line items]                  
Maximum credit facility 2,425,000,000                
Maximum borrowing capacity, term extended       2,425,000,000          
Maximum borrowing capacity increased       70,000,000          
Revolving syndicated credit facility maturing June 2022                  
Disclosure of detailed information about borrowings [line items]                  
Maximum borrowing capacity not extended       70,000,000          
Non-Revolving Term Credit Facility Maturing March 2022                  
Disclosure of detailed information about borrowings [line items]                  
(Repayment) issue of bank credit facilities and commercial paper, net 500,000,000     1,000,000,000          
Maximum credit facility re draw               $ 1,000,000,000  
Revolving Term Credit Facility Maturing February 2024                  
Disclosure of detailed information about borrowings [line items]                  
Maximum credit facility $ 500,000,000                
Non-revolving term credit facility maturing June 2022                  
Disclosure of detailed information about borrowings [line items]                  
Maximum credit facility           $ 3,250,000,000      
(Repayment) issue of bank credit facilities and commercial paper, net       $ 3,088,000,000          
Commercial Paper                  
Disclosure of detailed information about borrowings [line items]                  
Maximum credit facility             $ 2,500,000,000    
Credit facilities and commercial paper | Weighted average                  
Disclosure of detailed information about borrowings [line items]                  
Borrowings, interest rate 4.30%     0.80%     4.30%   0.80%
Long-term debt | Weighted average                  
Disclosure of detailed information about borrowings [line items]                  
Borrowings, interest rate 4.30%     3.50%     4.30%   3.50%
Medium-term borrowings expiring August 2023                  
Disclosure of detailed information about borrowings [line items]                  
Base shell prospectus borrowings, authorized       $ 3,000,000,000          
3.31% Medium-term Notes                  
Disclosure of detailed information about borrowings [line items]                  
Borrowings, interest rate 3.31%           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%           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%    
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%    
Repayment of medium-term notes $ 159,000,000                
2.50% Medium-term Notes due January 2028                  
Disclosure of detailed information about borrowings [line items]                  
Borrowings, interest rate 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%     3.45%     2.95%   3.45%
Base shell prospectus borrowings, authorized                 $ 3,000,000,000
Repayment of long-term debt   $ 1,000,000,000     $ 500,000,000