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Financial Instruments - Foreign Currency Exchange Rate Risk Management (Details) | 12 Months Ended
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Dec. 31, 2019 USD ($) $ / $
Foreign currency exchange rate risk | Cash flow hedges | Forward contracts |
Disclosure of detailed information about hedging instruments [line items] |
Notional amount | $ 3,999,000,000
USD |
Disclosure of detailed information about hedging instruments [line items] |
Exchange rate (US$/C$) | 1.00
Cross currency swaps | Foreign currency exchange rate risk | Cash flow hedges | Currency swap contract, term through November 2021 |
Disclosure of detailed information about hedging instruments [line items] |
Amount | 500,000,000
Exchange rate (US$/C$) | $ / $ | 1.022
Cross currency swaps | Foreign currency exchange rate risk | Cash flow hedges | Currency swap contract, term through March 2038 |
Disclosure of detailed information about hedging instruments [line items] |
Amount | 550,000,000
Exchange rate (US$/C$) | $ / $ | 1.170
Cross currency swaps | USD | Foreign currency exchange rate risk | Cash flow hedges | Currency swap contract, term through November 2021 |
Disclosure of detailed information about hedging instruments [line items] |
Interest rate | 3.45%
Cross currency swaps | USD | Foreign currency exchange rate risk | Cash flow hedges | Currency swap contract, term through March 2038 |
Disclosure of detailed information about hedging instruments [line items] |
Interest rate | 6.25%
Cross currency swaps | CAD | Foreign currency exchange rate risk | Cash flow hedges | Currency swap contract, term through November 2021 |
Disclosure of detailed information about hedging instruments [line items] |
Interest rate | 3.96%
Cross currency swaps | CAD | Foreign currency exchange rate risk | Cash flow hedges | Currency swap contract, term through March 2038 |
Disclosure of detailed information about hedging instruments [line items] |
Interest rate | 5.76%
Forward contracts | Foreign currency exchange rate risk |
Disclosure of detailed information about hedging instruments [line items] |
Notional amount | $ 4,564,000,000
Derivative, term of contract | 90 days

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- Definition The average exchange rate used by the entity. Exchange rate is the ratio of exchange for two currencies. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_112_c&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The average rate of a hedging instrument. [Refer: Hedging instruments [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 23B -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_23B_b&doctype=Standard -URIDate 2019-03-27 + Details
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