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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
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)