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Debt - Summary of Debt Continuity (Detail) $ in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2018 CAD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 CAD ($) | Dec. 31, 2017 USD ($)
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings at beginning of period | $ 6,369 |  |  |
Non-cash changes |  |  |  |
Borrowings at end of balance | 5,519 |  | $ 6,369 |
Debt Continuity [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings at beginning of period | 6,369 | $ 5,077 | 8,343 | $ 6,213
Cash flows |  |  |  |
Scheduled debt repayments | (28) | (22) | (64) | (49)
Debt repurchases | (1,328) | (1,015) | (1,831) | (1,356)
Finance lease payments (c) | (54) | (42) | (34) | (26)
Non-cash changes |  |  |  |
Loss on debt repurchases (a)(b) | 26 | 20 | 141 | 105
Changes in foreign exchange rates | 472 | (20) | (424) |
Finance lease liabilities (c) | 78 | 60 | 234 | 187
Finance fees and discount amortization | 1 |  | 4 | 3
Other | (17) | (12) |  |
Borrowings at end of balance | $ 5,519 | $ 4,046 | $ 6,369 | $ 5,077

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- Definition The cash outflow for repayments of bonds, notes and debentures. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2018-01-01 -Paragraph 17 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2018-03-01&anchor=para_17&doctype=Standard -URIDate 2018-03-16 + Details
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