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Financial and capital management - Liquidity risk (Details) - CAD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Minimum finance lease payments payable | $ 2,808 |
MLSE financial liability | 135 | $ 135
2018 |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Minimum finance lease payments payable | 572 |
2019 |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Minimum finance lease payments payable | 501 |
2020 |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Minimum finance lease payments payable | 326 |
2021 |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Minimum finance lease payments payable | 278 |
2022 |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Minimum finance lease payments payable | 248 |
THEREAFTER |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Minimum finance lease payments payable | 883 |
Gross carrying amount |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Long-term debt | 19,317 | 17,902
Gross carrying amount | Notes payable |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Current borrowings | 3,151 | 2,649
Gross carrying amount | Loans secured by trade receivables |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Current borrowings | 921 | $ 931
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 | 8,416 |
MLSE financial liability | 135 |
Total | 32,576 |
Liquidity risk | 2018 |  |
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 | 792 |
MLSE financial liability | 135 |
Total | 6,232 |
Liquidity risk | 2019 |  |
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 | 688 |
MLSE financial liability | 0 |
Total | 2,730 |
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 | 628 |
MLSE financial liability | 0 |
Total | 2,378 |
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 | 586 |
MLSE financial liability | 0 |
Total | 3,111 |
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 | 525 |
MLSE financial liability | 0 |
Total | 2,487 |
Liquidity risk | THEREAFTER |  |
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 | 5,197 |
MLSE financial liability | 0 |
Total | 15,638 |
Liquidity risk | Gross carrying amount |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Minimum finance lease payments payable | 2,808 |
Liquidity risk | Gross carrying amount | 2018 |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Minimum finance lease payments payable | 572 |
Liquidity risk | Gross carrying amount | 2019 |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Minimum finance lease payments payable | 501 |
Liquidity risk | Gross carrying amount | 2020 |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Minimum finance lease payments payable | 326 |
Liquidity risk | Gross carrying amount | 2021 |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Minimum finance lease payments payable | 278 |
Liquidity risk | Gross carrying amount | 2022 |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Minimum finance lease payments payable | 248 |
Liquidity risk | Gross carrying amount | THEREAFTER |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Minimum finance lease payments payable | 883 |
Liquidity risk | Gross carrying amount | Long-term debt |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Long-term debt | 17,145 |
Liquidity risk | Gross carrying amount | Long-term debt | 2018 |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Long-term debt | 661 |
Liquidity risk | Gross carrying amount | Long-term debt | 2019 |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Long-term debt | 1,541 |
Liquidity risk | Gross carrying amount | Long-term debt | 2020 |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Long-term debt | 1,424 |
Liquidity risk | Gross carrying amount | Long-term debt | 2021 |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Long-term debt | 2,247 |
Liquidity risk | Gross carrying amount | Long-term debt | 2022 |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Long-term debt | 1,714 |
Liquidity risk | Gross carrying amount | Long-term debt | THEREAFTER |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Long-term debt | 9,558 |
Liquidity risk | Gross carrying amount | Notes payable |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Current borrowings | 3,151 |
Liquidity risk | Gross carrying amount | Notes payable | 2018 |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Current borrowings | 3,151 |
Liquidity risk | Gross carrying amount | Notes payable | 2019 |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Current borrowings | 0 |
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 | THEREAFTER |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Current borrowings | 0 |
Liquidity risk | Gross carrying amount | Loans secured by trade receivables |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Current borrowings | 921 |
Liquidity risk | Gross carrying amount | Loans secured by trade receivables | 2018 |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Current borrowings | 921 |
Liquidity risk | Gross carrying amount | Loans secured by trade receivables | 2019 |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Current borrowings | 0 |
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 | THEREAFTER |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Current borrowings | $ 0 |

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- Definition 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]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_25&doctype=Standard -URIDate 2017-03-09 + Details
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