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Debt - Summary of Debt Continuity (Detail) CAD in Millions, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 CAD | Dec. 31, 2017 USD ($) | Dec. 31, 2016 CAD | Dec. 31, 2016 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Borrowings at beginning of period | CAD 8,343 |  |  |  |  |
Cash flows |  |  |  |  |  |
Issuance of debt | $ |  |  |  | $ 1,227 |  |
Non-cash changes |  |  |  |  |  |
Borrowings at end of balance | 6,369 |  | CAD 8,343 |  |  |
Debt Continuity [member] |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Borrowings at beginning of period | 8,343 | $ 6,213 | 9,634 | 6,961 |  |
Cash flows |  |  |  |  |  |
Issuance of debt |  |  | 1,567 | 1,227 |  |
Scheduled debt repayments | (64) | (49) |  |  |  |
Debt repurchases | (1,831) | (1,356) | (2,531) | (1,960) |  |
Finance lease payments (c) | (34) |  | (29) |  | $ (26) | $ (22)
Non-cash changes |  |  |  |  |  |
Issuance of debt |  |  | 22 | 17 |  |
Loss (gain) on debt repurchases (a)(b) | 141 | 105 | (49) | (37) |  |
Changes in foreign exchange rates | (424) |  | (308) |  |  |
Finance lease liabilities (c) | 234 | 187 | 28 | 21 |  |
Finance fees and discount amortization | 4 | 3 | 9 | 6 |  |
Borrowings at end of balance | CAD 6,369 | $ 5,077 | CAD 8,343 | $ 6,213 |  |

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