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Gains and Losses on Asset Sales (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Investment And Other Income [Line Items]      
Proceeds from asset sales $ 82 $ 59 $ 232
Book value of asset sales 36 5 12
Gain (loss) on asset sales, before-tax [1] 46 54 220
Gain (loss) on asset sales, after-tax [1] $ 42 $ 38 $ 192
[1] 2017 included a gain of $174 million ($151 million after tax) from the sale of surplus property in Ontario.