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Financial Instruments and Financial Risk Management - Summary of U.S. Dollar Financial Instruments Subject to Foreign Exchange Risk (Detail) - Canada, Dollars - Currency risk - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Maximum exposure to credit risk | $ (3,078) | $ (2,683)
Cash and cash equivalents |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Maximum exposure to credit risk | 85 | 907
Trade and settlement receivables |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Maximum exposure to credit risk | 505 | 640
Trade accounts payable and other liabilities |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Maximum exposure to credit risk | 459 | 421
Debt |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Maximum exposure to credit risk | 3,209 | 3,809
Net investment in foreign operations hedged |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Maximum exposure to credit risk | 2,969 | 2,628
Net U.S. dollar exposure |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Maximum exposure to credit risk | $ (109) | $ (55)

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