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Other Operating Income (Expense) - Schedule of Other Operating Income (Expense) (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Other operating Income (Expenses) [abstract]    
Settlement pricing adjustments (Note 28(b)) $ (117) $ 190
Share-based compensation (59) (125)
Environmental and care and maintenance costs (31) (186)
Social responsibility and donations (18) (7)
Gain (loss) on sale of assets (3) 35
Commodity derivatives (36) 12
Take or pay contract costs (106) (81)
Waneta Dam sale - Gain on disposal of property plant and equipment and break free 888 (28)
Other (68) (40)
Other operating income (expense) $ 450 $ (230)