Gains and Losses on Asset Sales (Detail) - CAD CAD in Millions |
3 Months Ended | 9 Months Ended | |||||||
---|---|---|---|---|---|---|---|---|---|
Sep. 30, 2017 |
Sep. 30, 2016 |
Sep. 30, 2017 |
Sep. 30, 2016 |
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Investment And Other Income [Line Items] | |||||||||
Proceeds from asset sales | CAD 8 | CAD 1,194 | CAD 230 | CAD 1,244 | |||||
Book value of asset sales | 2 | 285 | 12 | 292 | |||||
Gain (loss) on asset sales, before tax | [1],[2] | 6 | 909 | 219 | 952 | ||||
Gain (loss) on asset sales, after tax | [1],[2] | CAD 5 | CAD 774 | CAD 191 | CAD 808 | ||||
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