Gains and Losses on Asset Sales (Parenthetical) (Detail) - CAD CAD in Billions |
3 Months Ended | 9 Months Ended |
|---|---|---|
Sep. 30, 2016 |
Sep. 30, 2016 |
|
| Investment And Other Income [Line Items] | ||
| Expected gain on Planned consideration on sale of remaining company-owned Esso retail | CAD 0.8 | CAD 0.8 |
| Expected gain on Planned consideration on sale of remaining company-owned Esso retail, net of tax | CAD 0.7 | CAD 0.7 |