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Changes in Accumulated Other Comprehensive Loss ("AOCL") by Component - Amounts in Pension and Post-retirement Defined Benefit Plans Reclassified from AOCL (Details) - Reclassification out of Accumulated Other Comprehensive Income - CAD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Amortization of prior service costs $ 0 $ (1) $ 0 $ (1)
Recognition of net actuarial loss 53 45 158 135
Total before income tax 53 44 158 134
Income tax recovery (14) (11) (41) (35)
Total net of income tax $ 39 $ 33 $ 117 $ 99