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Finance Costs - Schedule of Finance Costs (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Finance Costs [Abstract]      
Interest Expense – Short-Term Borrowings and Long-Term Debt $ 392 $ 407 $ 516
Net (Discount) Premium on Redemption of Long-Term Debt (Note 24) (25) (63) 17
Interest Expense – Lease Liabilities (Note 25) 87 82  
Unwinding of Discount on Decommissioning Liabilities (Note 27) 57 58 62
Other 25 27 32
Total $ 536 $ 511 $ 627