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Accounting for Financial Instruments - Summary of U.S. Dollar Financial Instruments Subject to Foreign Exchange Risk (Detail) CAD in Millions, $ in Millions | Dec. 31, 2017 CAD | Dec. 31, 2017 USD ($) | Dec. 31, 2016 CAD | Dec. 31, 2016 USD ($) | Dec. 31, 2015 CAD
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Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |
Cash and cash equivalents | CAD | CAD 952 |  | CAD 1,407 |  | CAD 1,887
Debt | CAD | CAD (6,369) |  | CAD (8,343) |  |
Currency risk [member] |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |
Cash and cash equivalents |  | $ 368 |  | $ 521 |
Trade accounts receivable |  | 913 |  | 867 |
Trade accounts payable and other liabilities |  | (569) |  | (572) |
Debt |  | (4,831) |  | (6,141) |
Financial instruments subject to foreign exchange risk |  | (4,119) |  | (5,325) |
Net investment in foreign operations hedged |  | 4,149 |  | 5,424 |
Net U.S. dollar exposure |  | $ 30 |  | $ 99 |

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