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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 [Member] - CAD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Amortization of prior service costs $ 0 $ 1 $ 0 $ 1
Recognition of net actuarial loss 45 20 90 41
Total before income tax 45 21 90 42
Income tax recovery (12) (5) (24) (10)
Total net of income tax $ 33 $ 16 $ 66 $ 32