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Gains and Losses on Asset Sales (Parenthetical) (Detail) - CAD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Investment And Other Income [Line Items]        
Gain (loss) on asset sales, before- tax [1] $ 9 $ 31 $ 19 $ 213
Gain (loss) on asset sales, after- tax [1] $ 8 $ 28 $ 15 186
Surplus Property        
Investment And Other Income [Line Items]        
Gain (loss) on asset sales, before- tax       174
Gain (loss) on asset sales, after- tax       $ 151
[1] The six months ended June 30, 2017 included a gain of $174 million ($151 million after tax) from the sale of surplus property in Ontario