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Long-Term Debt - Narrative (Details)
 3 Months Ended 12 Months Ended
Mar. 24, 2021
CAD ($)
Dec. 31, 2020
CAD ($)
Dec. 31, 2019
CAD ($)
Dec. 31, 2018
CAD ($)
Jun. 30, 2021
CAD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2020
GBP (£)
Dec. 31, 2019
USD ($)
Dec. 31, 2019
GBP (£)
Jun. 27, 2019
CAD ($)
Dec. 31, 2018
GBP (£)
Disclosure of detailed information about borrowings [line items]                      
Borrowings   $ 21,453,000,000 $ 20,982,000,000                
Repayments of borrowings   397,000,000 0 $ 0              
Letters of credit and guarantees outstanding   489,000,000 468,000,000                
Gross carrying amount                      
Disclosure of detailed information about borrowings [line items]                      
Borrowings   21,560,000,000 21,090,000,000                
Bank credit facilities                      
Disclosure of detailed information about borrowings [line items]                      
Maximum credit facility   4,958,000,000                  
Term Credit Facility                      
Disclosure of detailed information about borrowings [line items]                      
Maximum credit facility   6,738,000,000                  
Demand credit facility                      
Disclosure of detailed information about borrowings [line items]                      
Maximum credit facility   100,000,000         £ 5,000,000   £ 5,000,000   £ 15,000,000
Non-Revolving Term Credit Facility Maturing February 2022                      
Disclosure of detailed information about borrowings [line items]                      
Maximum credit facility   1,000,000,000                  
Revolving syndicated credit facility maturing June 2022                      
Disclosure of detailed information about borrowings [line items]                      
Maximum credit facility   2,425,000,000                  
Non-revolving term credit facility maturing June 2022                      
Disclosure of detailed information about borrowings [line items]                      
Maximum credit facility $ 2,725,000,000 3,088,000,000 3,250,000,000             $ 3,250,000,000  
Credit facility annual amortization due         $ 162,500,000            
Repayments of borrowings $ 362,500,000 162,500,000                  
Non-revolving term credit facility maturing February 2023                      
Disclosure of detailed information about borrowings [line items]                      
Maximum credit facility   2,650,000,000 2,650,000,000                
Revolving syndicated credit facility maturing June 2023                      
Disclosure of detailed information about borrowings [line items]                      
Maximum credit facility   2,425,000,000 2,425,000,000                
Non-revolving term credit facility maturing February 2021                      
Disclosure of detailed information about borrowings [line items]                      
Maximum credit facility   750,000,000                  
Non-revolving term credit facility maturing May 2020                      
Disclosure of detailed information about borrowings [line items]                      
Repayments of lines of credit     1,800,000,000                
Non-revolving term credit facility maturing October 2020                      
Disclosure of detailed information about borrowings [line items]                      
Maximum credit facility     2,200,000,000                
Revolving syndicated credit facility maturing June 2019                      
Disclosure of detailed information about borrowings [line items]                      
Maximum credit facility     330,000,000                
Revolving syndicated credit facility maturing June 2021 to June 2023                      
Disclosure of detailed information about borrowings [line items]                      
Maximum credit facility     2,095,000,000                
Commercial Paper                      
Disclosure of detailed information about borrowings [line items]                      
Maximum credit facility   2,500,000,000                  
Borrowings   544,000,000       $ 426,000,000   $ 254,000,000      
Commercial Paper | Gross carrying amount                      
Disclosure of detailed information about borrowings [line items]                      
Borrowings   $ 544,000,000 $ 329,000,000                
Credit facilities and commercial paper | Weighted average                      
Disclosure of detailed information about borrowings [line items]                      
Borrowings, interest rate   1.10% 2.50%     1.10% 1.10% 2.50% 2.50%    
Long-term debt | Gross carrying amount                      
Disclosure of detailed information about borrowings [line items]                      
Borrowings   $ 16,746,000,000 $ 15,102,000,000                
Long-term debt | Weighted average                      
Disclosure of detailed information about borrowings [line items]                      
Borrowings, interest rate   3.50% 4.00%     3.50% 3.50% 4.00% 4.00%    
1.45% debentures due November 16, 2023                      
Disclosure of detailed information about borrowings [line items]                      
Borrowings   $ 500,000,000                  
Borrowings, interest rate   1.45%       1.45% 1.45%        
1.45% debentures due November 16, 2023 | Gross carrying amount                      
Disclosure of detailed information about borrowings [line items]                      
Borrowings   $ 500,000,000 $ 0                
2.50% debentures due January 17, 2028                      
Disclosure of detailed information about borrowings [line items]                      
Borrowings   $ 300,000,000                  
Borrowings, interest rate   2.50%       2.50% 2.50%        
2.50% debentures due January 17, 2028 | Gross carrying amount                      
Disclosure of detailed information about borrowings [line items]                      
Borrowings   $ 300,000,000 0                
Medium-Term Borrowings Expiring August 2021                      
Disclosure of detailed information about borrowings [line items]                      
Base shelf prospectus borrowings, available   2,200,000,000                  
Base shell prospectus borrowings, authorized   3,000,000,000                  
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% 2.89%        
2.89% debentures due August 14, 2020 | Gross carrying amount                      
Disclosure of detailed information about borrowings [line items]                      
Borrowings   $ 0 1,000,000,000                
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% 2.05%        
2.05% debentures due June 1, 2020 | Gross carrying amount                      
Disclosure of detailed information about borrowings [line items]                      
Borrowings   $ 0 900,000,000                
2.60% debentures due December 3, 2019                      
Disclosure of detailed information about borrowings [line items]                      
Repayments of borrowings     $ 500,000,000                
Borrowings, interest rate     2.60%         2.60% 2.60%    
3.05% debentures due June 19, 2019                      
Disclosure of detailed information about borrowings [line items]                      
Repayments of borrowings     $ 500,000,000                
Borrowings, interest rate     3.05%         3.05% 3.05%    
2.05% due July 15, 2025 (US$600 million)                      
Disclosure of detailed information about borrowings [line items]                      
Borrowings           $ 600,000,000          
Borrowings, interest rate   2.05%       2.05% 2.05%        
2.05% due July 15, 2025 (US$600 million) | Gross carrying amount                      
Disclosure of detailed information about borrowings [line items]                      
Borrowings   $ 765,000,000 $ 0                
2.95% due July 15, 2030 (US$500 million)                      
Disclosure of detailed information about borrowings [line items]                      
Borrowings           $ 500,000,000          
Borrowings, interest rate   2.95%       2.95% 2.95%        
2.95% due July 15, 2030 (US$500 million) | Gross carrying amount                      
Disclosure of detailed information about borrowings [line items]                      
Borrowings   $ 638,000,000 $ 0                
US dollar denominated debt, unsecured                      
Disclosure of detailed information about borrowings [line items]                      
Base shelf prospectus borrowings, available           $ 1,900,000,000          
Base shell prospectus borrowings, authorized           $ 3,000,000,000