Other Long-Term Obligations (Parenthetical) (Detail) - CAD CAD in Millions |
Sep. 30, 2016 |
Dec. 31, 2015 |
|---|---|---|
| Schedule of Other Liabilities [Line Items] | ||
| Employee retirement benefits obligations in current liabilities | CAD 58 | CAD 59 |
| Asset retirement obligations and other environmental liabilities in current liabilities | CAD 117 | CAD 116 |