| Canadian Oil | United States | |||||||||||
| and Gas | Oil and Gas | Corporate and | ||||||||||
| Properties | Properties | Other Assets | Total | |||||||||
| $ | $ | $ | $ | |||||||||
| Cost: | ||||||||||||
| Balance at January 1, 2016 | 33,376 | 16,653 | 179 | 50,208 | ||||||||
| Additions | 300 | 225 | 3 | 528 | ||||||||
| Change in decommissioning provision | (48 | ) | (4 | ) | - | (52 | ) | |||||
| Foreign currency translation and other | - | (502 | ) | - | (502 | ) | ||||||
| Balance at December 31, 2016 | 33,628 | 16,372 | 182 | 50,182 | ||||||||
| Additions | 405 | 39 | 5 | 449 | ||||||||
| Change in decommissioning provision | 94 | (3 | ) | - | 91 | |||||||
| Disposals | - | - | (29 | ) | (29 | ) | ||||||
| Foreign currency translation and other | - | (1,060 | ) | - | (1,060 | ) | ||||||
| Balance at December 31, 2017 | 34,127 | 15,348 | 158 | 49,633 |