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Financial Instruments and Financial Risk Management - Summary of U.S. Dollar Financial Instruments Subject to Foreign Exchange Risk (Detail) $ in Millions, $ in Millions | Dec. 31, 2018 CAD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 CAD ($) | Dec. 31, 2017 USD ($) | Jan. 01, 2017 CAD ($) | Dec. 31, 2016 CAD ($)
--- | --- | --- | --- | --- | --- | ---
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |
Cash and cash equivalents | $ 1,734 |  | $ 952 |  | $ 1,407 | $ 1,407
Debt | $ (5,519) |  | $ (6,369) |  |  |
Currency risk [member] |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |
Cash and cash equivalents |  | $ 907 |  | $ 368 |  |
Trade and settlement receivables |  | 640 |  | 913 |  |
Trade accounts payable and other liabilities |  | (421) |  | (569) |  |
Debt |  | (3,809) |  | (4,831) |  |
U.S. dollar financial instruments subject to foreign exchange risk |  | (2,683) |  | (4,119) |  |
Net investment in foreign operations hedged |  | 2,628 |  | 4,149 |  |
Net U.S. dollar exposure |  | $ (55) |  | $ 30 |  |

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