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financial instruments - Derivative gains and losses (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Currency risk |  |
Disclosure of detailed information about financial instruments |  |
Amount of gain (loss) recognized in other comprehensive income (effective portion) | $ 233 | $ (132)
Gain (loss) reclassified from other comprehensive income to income (effective portion) | 247 | (151)
Other market risk |  |
Disclosure of detailed information about financial instruments |  |
Amount of gain (loss) recognized in other comprehensive income (effective portion) | (8) | 24
Gain (loss) reclassified from other comprehensive income to income (effective portion) | 2 | 17
Derivatives |  |
Disclosure of detailed information about financial instruments |  |
Amount of gain (loss) recognized in other comprehensive income (effective portion) | 225 | (108)
Gain (loss) reclassified from other comprehensive income to income (effective portion) | 249 | (134)
Derivatives | Currency risk |  |
Disclosure of detailed information about financial instruments |  |
Amount of gain (loss) recognized in other comprehensive income (effective portion) | 233 | (132)
Gain (loss) reclassified from other comprehensive income to income (effective portion) | 247 | (151)
Derivatives held for hedging | Currency risk related to purchases | U.S. Dollars | Goods and services purchased |  |
Disclosure of detailed information about financial instruments |  |
Amount of gain (loss) recognized in other comprehensive income (effective portion) | 39 | (23)
Gain (loss) reclassified from other comprehensive income to income (effective portion) | 6 | (5)
Derivatives held for hedging | Currency risk related to long-term debt | U.S. Dollars | Financing costs |  |
Disclosure of detailed information about financial instruments |  |
Amount of gain (loss) recognized in other comprehensive income (effective portion) | 194 | (109)
Gain (loss) reclassified from other comprehensive income to income (effective portion) | 241 | (146)
Spread included in fair value of derivative instruments | 25 | 5
Derivatives held for hedging | Other market risk | Employee benefits expense |  |
Disclosure of detailed information about financial instruments |  |
Amount of gain (loss) recognized in other comprehensive income (effective portion) | (8) | 24
Gain (loss) reclassified from other comprehensive income to income (effective portion) | 2 | 17
Derivatives held for trading | Currency risk | Financing costs |  |
Disclosure of detailed information about financial instruments |  |
Gain (loss) recognized in income on derivatives |  | 3
Cash flow hedging item (HFH) | Derivatives held for hedging |  |
Disclosure of detailed information about financial instruments |  |
Ineffective portion of derivative instruments classified as cash flow hedging items | $ 0 | $ 0

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- Definition The gain (loss) recognised in profit or loss on hedge ineffectiveness. [Refer: Gain (loss) on hedge ineffectiveness] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 24C -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_24C_a_i&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 24C -Subparagraph b -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_24C_b_ii&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The gains (losses) recognised in other comprehensive income on cash flow hedges, before tax. [Refer: Cash flow hedges [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 91 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_91_b&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2021-01-01 -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 23 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_23_c&doctype=Standard&book=b -URIDate 2018-03-16 + Details
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- Definition The gains (losses) on financial assets at fair value through profit or loss classified as held for trading. [Refer: Financial assets at fair value through profit or loss, classified as held for trading; Gains (losses) on financial assets at fair value through profit or loss] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2021-01-01 -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 20 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_20_a_i&doctype=Standard&book=b -URIDate 2018-03-16 + Details
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- Definition The amount of reclassification adjustments related to cash flow hedges, before tax. Reclassification adjustments are amounts reclassified to profit (loss) in the current period that were recognised in other comprehensive income in the current or previous periods. [Refer: Cash flow hedges [member]; Other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 92 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_92&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2021-01-01 -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 23 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_23_d&doctype=Standard&book=b -URIDate 2018-03-16 + Details
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