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Cash Flow Information (Details) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Cash flows from (used in) operating activities [abstract] |  |  |
Accounts receivable | $ 58 | $ (228) | $ (23)
Prepaid expenses | 19 | (75) | 5
Income taxes receivable | 0 | 8 | (4)
Inventory | (21) | (7) | 11
Accounts payable, accrued liabilities, and provisions | (97) | 186 | 81
Income taxes payable | (3) | 2 | 3
Change in non-cash operating working capital | $ (44) | $ (114) | $ 73

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- Definition The increase (decrease) in working capital. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2017-01-01 -Paragraph 20 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2017-03-01&anchor=para_20&doctype=Standard -URIDate 2017-03-09 + Details
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