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Financial and capital management - Maturity Analysis for Recognized Financial Liabilities (Details) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
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	$ 28,160	$ 24,970
Gross carrying amount | Notes payable
Disclosure of maturity analysis for non-derivative financial liabilities [line items]
Current borrowings	735	392
Gross carrying amount | Lease liabilities
Disclosure of maturity analysis for non-derivative financial liabilities [line items]
Long-term debt	4,309	4,356
Gross carrying amount | Loans secured by trade receivables
Disclosure of maturity analysis for non-derivative financial liabilities [line items]
Current borrowings	900	$ 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	13,189
Net payments (receipts) on cross currency interest rate swaps	359
MLSE financial liability	149
Total	44,333
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	918
Net payments (receipts) on cross currency interest rate swaps	11
MLSE financial liability	149
Total	3,878
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	890
Net payments (receipts) on cross currency interest rate swaps	12
MLSE financial liability	0
Total	3,367
Liquidity risk | 2024
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	825
Net payments (receipts) on cross currency interest rate swaps	(2)
MLSE financial liability	0
Total	3,424
Liquidity risk | 2025
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	770
Net payments (receipts) on cross currency interest rate swaps	12
MLSE financial liability	0
Total	3,374
Liquidity risk | 2026
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	718
Net payments (receipts) on cross currency interest rate swaps	12
MLSE financial liability	0
Total	2,697
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	9,068
Net payments (receipts) on cross currency interest rate swaps	314
MLSE financial liability	0
Total	27,593
Liquidity risk | Gross carrying amount | Long-term debt
Disclosure of maturity analysis for non-derivative financial liabilities [line items]
Long-term debt	23,851
Liquidity risk | Gross carrying amount | Long-term debt | 2022
Disclosure of maturity analysis for non-derivative financial liabilities [line items]
Long-term debt	156
Liquidity risk | Gross carrying amount | Long-term debt | 2023
Disclosure of maturity analysis for non-derivative financial liabilities [line items]
Long-term debt	1,632
Liquidity risk | Gross carrying amount | Long-term debt | 2024
Disclosure of maturity analysis for non-derivative financial liabilities [line items]
Long-term debt	2,060
Liquidity risk | Gross carrying amount | Long-term debt | 2025
Disclosure of maturity analysis for non-derivative financial liabilities [line items]
Long-term debt	2,153
Liquidity risk | Gross carrying amount | Long-term debt | 2026
Disclosure of maturity analysis for non-derivative financial liabilities [line items]
Long-term debt	1,561
Liquidity risk | Gross carrying amount | Long-term debt | THERE- AFTER
Disclosure of maturity analysis for non-derivative financial liabilities [line items]
Long-term debt	16,289
Liquidity risk | Gross carrying amount | Notes payable
Disclosure of maturity analysis for non-derivative financial liabilities [line items]
Current borrowings	735
Liquidity risk | Gross carrying amount | Notes payable | 2022
Disclosure of maturity analysis for non-derivative financial liabilities [line items]
Current borrowings	735
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 | 2024
Disclosure of maturity analysis for non-derivative financial liabilities [line items]
Current borrowings	0
Liquidity risk | Gross carrying amount | Notes payable | 2025
Disclosure of maturity analysis for non-derivative financial liabilities [line items]
Current borrowings	0
Liquidity risk | Gross carrying amount | Notes payable | 2026
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	5,150
Interest expense on debt instruments issued	841
Liquidity risk | Gross carrying amount | Lease liabilities | 2022
Disclosure of maturity analysis for non-derivative financial liabilities [line items]
Current borrowings	1,009
Liquidity risk | Gross carrying amount | Lease liabilities | 2023
Disclosure of maturity analysis for non-derivative financial liabilities [line items]
Current borrowings	833
Liquidity risk | Gross carrying amount | Lease liabilities | 2024
Disclosure of maturity analysis for non-derivative financial liabilities [line items]
Current borrowings	541
Liquidity risk | Gross carrying amount | Lease liabilities | 2025
Disclosure of maturity analysis for non-derivative financial liabilities [line items]
Current borrowings	439
Liquidity risk | Gross carrying amount | Lease liabilities | 2026
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	1,922
Liquidity risk | Gross carrying amount | Loans secured by trade receivables
Disclosure of maturity analysis for non-derivative financial liabilities [line items]
Current borrowings	900
Liquidity risk | Gross carrying amount | Loans secured by trade receivables | 2022
Disclosure of maturity analysis for non-derivative financial liabilities [line items]
Current borrowings	900
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 | 2024
Disclosure of maturity analysis for non-derivative financial liabilities [line items]
Current borrowings	0
Liquidity risk | Gross carrying amount | Loans secured by trade receivables | 2025
Disclosure of maturity analysis for non-derivative financial liabilities [line items]
Current borrowings	0
Liquidity risk | Gross carrying amount | Loans secured by trade receivables | 2026
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

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The amount of liabilities that are: (a) a contractual obligation: (i) to deliver cash or another financial asset to another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially unfavourable to the entity; or (b) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to deliver a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose, rights, options or warrants to acquire a fixed number of the entity’s own equity instruments for a fixed amount of any currency are equity instruments if the entity offers the rights, options or warrants pro rata to all of its existing owners of the same class of its own non-derivative equity instruments. Also, for those purposes the entity’s own equity instruments do not include puttable financial instruments that are classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. As an exception, an instrument that meets the definition of a financial liability is classified as an equity instrument if it has all the features and meets the conditions in paragraphs 16A-16B or paragraphs 16C-16D of IAS 32. [Refer: Financial instruments, class [member]; Financial assets; Derivatives [member]]

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