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Long-Term Debt - Narrative (Details)
£ in Millions
 12 Months Ended
Dec. 31, 2021
CAD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
CAD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
CAD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2021
GBP (£)
Dec. 30, 2021
CAD ($)
Dec. 31, 2020
USD ($)
Jun. 27, 2019
CAD ($)
Disclosure of detailed information about borrowings [line items]                    
Repayments of borrowings $ 183,000,000   $ 397,000,000   $ 0          
Letters of credit and guarantees outstanding 513,000,000   489,000,000              
Borrowings 14,694,000,000   21,453,000,000              
Gross carrying amount                    
Disclosure of detailed information about borrowings [line items]                    
Borrowings 14,781,000,000   21,560,000,000              
Bank credit facilities                    
Disclosure of detailed information about borrowings [line items]                    
Maximum credit facility 6,098,000,000                  
Term Credit Facility                    
Disclosure of detailed information about borrowings [line items]                    
Maximum credit facility 1,150,000,000                  
Demand credit facility                    
Disclosure of detailed information about borrowings [line items]                    
Maximum credit facility 100,000,000           £ 5      
Term Credit Facility Maturing February 2023                    
Disclosure of detailed information about borrowings [line items]                    
Maximum credit facility 1,000,000,000                  
Non-revolving term credit facility maturing February 2023                    
Disclosure of detailed information about borrowings [line items]                    
Maximum credit facility 1,150,000,000             $ 2,650,000,000    
Repayments of borrowings 1,500,000,000                  
Revolving Syndicated Credit Facility Maturing June 2022 And June 2024                    
Disclosure of detailed information about borrowings [line items]                    
Maximum credit facility 2,495,000,000                  
Revolving syndicated credit facility maturing June 2022                    
Disclosure of detailed information about borrowings [line items]                    
Maximum credit facility 70,000,000                  
Maximum borrowing capacity increased 70,000,000                  
Maximum borrowing capacity not extended 70,000,000                  
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                  
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                  
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                  
Non-revolving term credit facility maturing February 2022                    
Disclosure of detailed information about borrowings [line items]                    
Maximum credit facility 1,000,000,000                  
Non-Revolving Term Credit Facility Maturing March 2022                    
Disclosure of detailed information about borrowings [line items]                    
Maximum credit facility re draw 1,000,000,000                  
Non-revolving term credit facility maturing June 2022                    
Disclosure of detailed information about borrowings [line items]                    
Maximum credit facility         $ 3,250,000,000         $ 3,250,000,000
Repayments of borrowings 3,088,000,000                  
Commercial Paper                    
Disclosure of detailed information about borrowings [line items]                    
Maximum credit facility           $ 2,500,000,000        
Borrowings           $ 0     $ 426,000,000  
Commercial Paper | Gross carrying amount                    
Disclosure of detailed information about borrowings [line items]                    
Borrowings $ 0   $ 544,000,000              
Credit facilities and commercial paper | Weighted average                    
Disclosure of detailed information about borrowings [line items]                    
Borrowings, interest rate 0.80%   1.10%     0.80% 0.80%   1.10%  
Long-term debt | Gross carrying amount                    
Disclosure of detailed information about borrowings [line items]                    
Borrowings $ 11,581,000,000   $ 16,746,000,000              
Long-term debt | Weighted average                    
Disclosure of detailed information about borrowings [line items]                    
Borrowings, interest rate 3.50%   3.50%     3.50% 3.50%   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                  
1.45% debentures due November 16, 2023                    
Disclosure of detailed information about borrowings [line items]                    
Borrowings, interest rate 1.45%   1.45%     1.45% 1.45%   1.45%  
Borrowings     $ 500,000,000              
1.45% debentures due November 16, 2023 | Gross carrying amount                    
Disclosure of detailed information about borrowings [line items]                    
Borrowings $ 500,000,000   $ 500,000,000              
2.50% debentures due January 17, 2028                    
Disclosure of detailed information about borrowings [line items]                    
Borrowings, interest rate 2.50%   2.50%     2.50% 2.50%   2.50%  
Borrowings     $ 300,000,000              
2.50% debentures due January 17, 2028 | Gross carrying amount                    
Disclosure of detailed information about borrowings [line items]                    
Borrowings $ 300,000,000   300,000,000              
2.89% debentures due August 14, 2020                    
Disclosure of detailed information about borrowings [line items]                    
Repayments of borrowings     $ 1,000,000,000              
Borrowings, interest rate     2.89%           2.89%  
2.05% debentures due June 1, 2020                    
Disclosure of detailed information about borrowings [line items]                    
Repayments of borrowings     $ 900,000,000              
Borrowings, interest rate     2.05%           2.05%  
US dollar denominated debt, unsecured                    
Disclosure of detailed information about borrowings [line items]                    
Repayments of borrowings   $ 500,000,000                
Borrowings, interest rate 3.45%         3.45% 3.45%      
Base shell prospectus borrowings, authorized           $ 3,000,000,000        
2.05% due July 15, 2025 (US$600 million)                    
Disclosure of detailed information about borrowings [line items]                    
Borrowings, interest rate 2.05%   2.05%     2.05% 2.05%   2.05%  
Proceeds from borrowings       $ 600,000,000            
2.05% due July 15, 2025 (US$600 million) | Gross carrying amount                    
Disclosure of detailed information about borrowings [line items]                    
Borrowings $ 759,000,000   $ 765,000,000              
2.95% due July 15, 2030 (US$500 million)                    
Disclosure of detailed information about borrowings [line items]                    
Borrowings, interest rate 2.95%   2.95%     2.95% 2.95%   2.95%  
Proceeds from borrowings       $ 500,000,000            
2.95% due July 15, 2030 (US$500 million) | Gross carrying amount                    
Disclosure of detailed information about borrowings [line items]                    
Borrowings $ 633,000,000   $ 638,000,000