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Financial Instruments Carrying amounts and classifications of financial assets and liabilities (Details) - CAD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Disclosure of detailed information about financial instruments [line items] |  |
Cash equivalents | $ 0 | $ 0
Financial liabilities | 3,212 | 3,267
Accounts payable and accrued liabilities |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities | 413 | 496
Accounts payable and accrued liabilities | Amortized cost |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities | 413 | 496
Dividends payable |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities | 37 | 58
Dividends payable | Amortized cost |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities | 37 | 58
Credit facilities, long-term debt and finance lease obligations(2) |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities | 3,212 | 3,267
Credit facilities, long-term debt and finance lease obligations(2) | Amortized cost |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities | 3,212 | 3,267
Exchangeable securities |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities | 326 |
Exchangeable securities | Amortized cost |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities | 326 |
Within one year | Risk management liabilities |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities | 81 | 90
Within one year | Derivatives | Risk management liabilities | Trading securities |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities | 80 | 89
Within one year | Derivatives | Risk management liabilities | Hedging Liabilities |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities | 1 | 1
Later than one year | Risk management liabilities |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities | 29 | 41
Later than one year | Derivatives | Risk management liabilities | Trading securities |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities | 28 | 40
Later than one year | Derivatives | Risk management liabilities | Hedging Liabilities |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities | 1 | 1
Cash and cash equivalents |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 411 | 89
Cash and cash equivalents | Amortized cost |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 411 | 89
Restricted cash |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 32 | 66
Restricted cash | Amortized cost |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 32 | 66
Trade and other receivables |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 462 | 756
Trade and other receivables | Amortized cost |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 462 | 731
Trade and other receivables | Other financial assets (FVTPL) |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets |  | 25
Long-term portion of finance lease receivable |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 176 | 191
Long-term portion of finance lease receivable | Amortized cost |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 176 | 191
Risk management assets | Within one year |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 166 | 146
Risk management assets | Later than one year |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 640 | 662
Risk management assets | Hedging Asset | Within one year | Derivatives |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 71 | 60
Risk management assets | Hedging Asset | Later than one year | Derivatives |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 607 | 629
Risk management assets | Trading securities | Within one year | Derivatives |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 95 | 86
Risk management assets | Trading securities | Later than one year | Derivatives |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 33 | 33
Other assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 47 | 52
Other assets | Amortized cost |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | $ 47 | 37
Other assets | Other financial assets (FVTPL) |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets |  | $ 15

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- Definition The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) 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 receive 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 the entity’s own equity instruments do not include puttable financial instruments 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. [Refer: Financial instruments, class [member]; Financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_25&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 35H -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_35H&doctype=Standard -URIDate 2018-03-16 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 35I -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_35I&doctype=Standard -URIDate 2018-03-16 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 35M -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_35M&doctype=Standard -URIDate 2018-03-16 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 35N -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_35N&doctype=Standard -URIDate 2018-03-16 + Details
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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 2018-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_25&doctype=Standard -URIDate 2018-03-16 + Details
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