other operating income (Details) - CAD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2019 |
Jun. 30, 2018 |
Jun. 30, 2019 |
Jun. 30, 2018 |
|
| other operating income | ||||
| Government assistance, including deferral account amortization | $ 5 | $ 6 | $ 12 | $ 12 |
| Investment income, gain(loss) on disposal of assets and other | 4 | 7 | 13 | 26 |
| Interest income | 1 | 2 | 1 | |
| Total | $ 10 | $ 13 | $ 27 | $ 39 |