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Financial and capital management - Maturity Analysis for Recognized Financial Liabilities (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Duration of maturity of financial liabilities 5 years  
Gross carrying amount    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt $ 24,970 $ 23,300
Gross carrying amount | Notes payable    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Current borrowings 392 1,994
Gross carrying amount | Lease liabilities    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 4,356 4,599
Gross carrying amount | Loans secured by trade receivables    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Current borrowings 1,050 $ 1,050
Liquidity risk    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Interest payable on long-term debt, notes payable and loan secured by trade receivables 11,381  
Net (receipts) payments on cross currency basis swaps 62  
MLSE financial liability 149  
Total 38,954  
Liquidity risk | 2021    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Interest payable on long-term debt, notes payable and loan secured by trade receivables 844  
Net (receipts) payments on cross currency basis swaps (1)  
MLSE financial liability 149  
Total 3,576  
Liquidity risk | 2020    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Interest payable on long-term debt, notes payable and loan secured by trade receivables 824  
Net (receipts) payments on cross currency basis swaps (1)  
MLSE financial liability 0  
Total 3,440  
Liquidity risk | 2021    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Interest payable on long-term debt, notes payable and loan secured by trade receivables 756  
Net (receipts) payments on cross currency basis swaps 0  
MLSE financial liability 0  
Total 3,032  
Liquidity risk | 2022    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Interest payable on long-term debt, notes payable and loan secured by trade receivables 693  
Net (receipts) payments on cross currency basis swaps 0  
MLSE financial liability 0  
Total 2,430  
Liquidity risk | 2023    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Interest payable on long-term debt, notes payable and loan secured by trade receivables 641  
Net (receipts) payments on cross currency basis swaps 0  
MLSE financial liability 0  
Total 3,172  
Liquidity risk | THERE- AFTER    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Interest payable on long-term debt, notes payable and loan secured by trade receivables 7,623  
Net (receipts) payments on cross currency basis swaps 64  
MLSE financial liability 0  
Total 23,304  
Liquidity risk | Gross carrying amount | Long-term debt    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 20,614  
Liquidity risk | Gross carrying amount | Long-term debt | 2021    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 221  
Liquidity risk | Gross carrying amount | Long-term debt | 2020    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 1,785  
Liquidity risk | Gross carrying amount | Long-term debt | 2021    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 1,665  
Liquidity risk | Gross carrying amount | Long-term debt | 2022    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 1,278  
Liquidity risk | Gross carrying amount | Long-term debt | 2023    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 2,125  
Liquidity risk | Gross carrying amount | Long-term debt | THERE- AFTER    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Long-term debt 13,540  
Liquidity risk | Gross carrying amount | Notes payable    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Current borrowings 392  
Liquidity risk | Gross carrying amount | Notes payable | 2021    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Current borrowings 392  
Liquidity risk | Gross carrying amount | Notes payable | 2020    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Current borrowings 0  
Liquidity risk | Gross carrying amount | Notes payable | 2021    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Current borrowings 0  
Liquidity risk | Gross carrying amount | Notes payable | 2022    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Current borrowings 0  
Liquidity risk | Gross carrying amount | Notes payable | 2023    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Current borrowings 0  
Liquidity risk | Gross carrying amount | Notes payable | THERE- AFTER    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Current borrowings 0  
Liquidity risk | Gross carrying amount | Lease liabilities    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Current borrowings 5,306  
Interest expense on debt instruments issued 950  
Liquidity risk | Gross carrying amount | Lease liabilities | 2021    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Current borrowings 921  
Liquidity risk | Gross carrying amount | Lease liabilities | 2020    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Current borrowings 832  
Liquidity risk | Gross carrying amount | Lease liabilities | 2021    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Current borrowings 611  
Liquidity risk | Gross carrying amount | Lease liabilities | 2022    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Current borrowings 459  
Liquidity risk | Gross carrying amount | Lease liabilities | 2023    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Current borrowings 406  
Liquidity risk | Gross carrying amount | Lease liabilities | THERE- AFTER    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Current borrowings 2,077  
Liquidity risk | Gross carrying amount | Loans secured by trade receivables    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Current borrowings 1,050  
Liquidity risk | Gross carrying amount | Loans secured by trade receivables | 2021    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Current borrowings 1,050  
Liquidity risk | Gross carrying amount | Loans secured by trade receivables | 2020    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Current borrowings 0  
Liquidity risk | Gross carrying amount | Loans secured by trade receivables | 2021    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Current borrowings 0  
Liquidity risk | Gross carrying amount | Loans secured by trade receivables | 2022    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Current borrowings 0  
Liquidity risk | Gross carrying amount | Loans secured by trade receivables | 2023    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Current borrowings 0  
Liquidity risk | Gross carrying amount | Loans secured by trade receivables | THERE- AFTER    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Current borrowings $ 0