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Income Tax Expense (Credit) for Components of Other Comprehensive Income (Loss) (Detail) - CAD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Postretirement benefits liability adjustment (excluding amortization) $ 17 $ (37)
Amortization of postretirement benefits liability adjustment included in net periodic benefit cost 11 11
Total $ 28 $ (26)