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SUPPLEMENTAL CASH FLOW INFORMATION - Additions to property, plant and equipment, net (Details) - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Cash Flow Statement [Abstract]    
Capital expenditures before proceeds on disposition $ 2,845 $ 2,815
Proceeds on disposition (38) (25)
Capital expenditures $ 2,807 $ 2,790