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Long-Term Debt (Parenthetical) (Detail) - CAD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Maximum long-term borrowing from affiliate $ 7,750,000,000  
Cancellation period long-term borrowing from affiliate, days 370 days  
Capitalized lease obligations for marine services, average imputed rate 7.50% 7.10%
Total capitalized lease obligations in current liabilities $ 18,000,000 $ 27,000,000
Principal payments on capital leases, in two years 13,000,000  
Principal payments on capital leases, in three years 13,000,000  
Principal payments on capital leases, in four years 13,000,000  
Principal payments on capital leases, in five years $ 13,000,000