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Employee Future Benefits - Narrative (Details) - CAD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Retirement Benefits [Abstract]        
Defined contribution plan cost recognized $ 9 $ 10 $ 22 $ 22