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Financing (Income) Expenses (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Finance expenses breakdown |  |
Interest on debt and finance leases | $ 897 | $ 945
Capitalized interest at 5.4% ( 2017- 5.5%) | (156) | (729)
Interest expense | 741 | 216
Interest on partnership liability | 56 | 5
Interest on pension and other postretirement benefits | 56 | 58
Accretion | 266 | 247
Foreign exchange loss (gain) on U.S. dollar denominated debt | 1,090 | (771)
Foreign exchange and other | (70) | (52)
Loss on extinguishment of long-term debt | 3 | 113
Realized gain on foreign currency hedges |  | (62)
Total Financing expenses | $ 2,142 | $ (246)
Debt instrument interest percentage | 5.40% | 5.50%

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- Definition The amount of exchange differences recognised in profit or loss that arise from foreign currency transactions, excluding those arising on financial instruments measured at fair value through profit or loss in accordance with IFRS 9. [Refer: At fair value [member]; Financial instruments, class [member]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 7 -IssueDate 2018-01-01 -Section A Statement of cash flows for an entity other than a financial institution -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2018-03-01&anchor=sect_AStatementofcashflowsforanentityotherthanafinancialinstitution&doctype=Illustrative%20Examples -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 21 -IssueDate 2018-01-01 -Paragraph 52 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=21&date=2018-03-01&anchor=para_52_a&doctype=Standard -URIDate 2018-03-16 + Details
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