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Financial Instruments and Financial Risk Management - Summary of U.S. Dollar Financial Instruments Subject to Foreign Exchange Risk (Detail) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Maximum exposure to credit risk | $ (135) | $ (109)
Canada, Dollars | Currency risk | Cash and cash equivalents |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Maximum exposure to credit risk | 23 | 85
Canada, Dollars | Currency risk | Trade and settlement receivables |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Maximum exposure to credit risk | 616 | 505
Canada, Dollars | Currency risk | Trade accounts payable and other liabilities |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Maximum exposure to credit risk | 608 | 459
Canada, Dollars | Currency risk | Debt |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Maximum exposure to credit risk | 3,741 | 3,209
Reduced by: Debt designated as a hedging instrument in our net investment hedge | Canada, Dollars | Currency risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Maximum exposure to credit risk | $ 3,575 | $ 2,969

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- Definition The amount of risk exposure associated with financial instruments with a shared characteristic that identifies a concentration of risks. [Refer: Financial instruments, class [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph B8 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_B8_c&doctype=Appendix&subtype=B -URIDate 2020-01-01 + Details
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