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Property, plant and equipment (Tables) | 9 Months Ended
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Sep. 30, 2020
Statement [LineItems] |
Disclosure of Property Plant and Equipment | Oil and Gas assets/ Facilities, Corporate assets
Cost |  | Nine months ended September 30, 2020 |  |  | Year ended December 31, 2019 |
Balance, beginning of period |  | $ | 10,388 |  |  | $ | 10,776 |
Capital expenditures |  |  | 46 |  |  |  | 103 |
Dispositions |  |  | — |  |  |  | (52 | )
Transfer from/(to) assets held for sale |  |  | 423 |  |  |  | (423 | )
Net decommissioning dispositions |  |  | (42 | ) |  |  | (16 | )
Balance, end of period |  | $ | 10,815 |  |  | $ | 10,388 |
Accumulated depletion and depreciation |  | Nine months ended September 30, 2020 |  |  | Year ended December 31, 2019 |
Balance, beginning of period |  | $ | 8,709 |  |  | $ | 8,202 |
Depletion and depreciation |  |  | 99 |  |  |  | 236 |
Impairments |  |  | 763 |  |  |  | 658 |
Transfers from/(to) asset held for sale |  |  | 346 |  |  |  | (346 | )
Dispositions |  |  | — |  |  |  | (41 | )
Balance, end of period |  | $ | 9,917 |  |  | $ | 8,709 |
|  | As at |
Net book value |  | September 30, 2020 |  |  | December 31, 2019 |
Total |  | $ | 898 |  |  | $ | 1,679 |
Summary of Right of Use Assets | The following table includes a break-down of the categories for right-of-use assets.
Cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Office |  |  | Transportation |  |  | Vehicle |  |  | Surface |  |  | Total |
Balance, January 1, 2019 |  | $ | 15 |  |  | $ | 17 |  |  | $ | 3 |  |  | $ | 2 |  |  | $ | 37 |
Additions (Terminations) |  |  | (2 | ) |  |  | — |  |  |  | 1 |  |  |  | — |  |  |  | (1 | )
Balance, December 31, 2019 |  | $ | 13 |  |  | $ | 17 |  |  | $ | 4 |  |  | $ | 2 |  |  | $ | 36 |
Additions (Terminations) |  |  | (13 | ) |  |  | (2 | ) |  |  | 2 |  |  |  | — |  |  |  | (13 | )
Balance, September 30, 2020 |  | $ | — |  |  | $ | 15 |  |  | $ | 6 |  |  | $ | 2 |  |  | $ | 23 |
Accumulated amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Office |  |  | Transportation |  |  | Vehicle |  |  | Surface |  |  | Total |
Balance, January 1, 2019 |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Amortization |  |  | 3 |  |  |  | 6 |  |  |  | 1 |  |  |  | — |  |  |  | 10 |
Balance, December 31, 2019 |  | $ | 3 |  |  | $ | 6 |  |  | $ | 1 |  |  | $ | — |  |  | $ | 10 |
Amortization |  |  | — |  |  |  | 4 |  |  |  | 1 |  |  |  | — |  |  |  | 5 |
Termination |  |  | (3 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (3 | )
Balance, September 30, 2020 |  | $ | — |  |  | $ | 10 |  |  | $ | 2 |  |  | $ | — |  |  | $ | 12 |
|  | As at |
Net book value |  | September 30, 2020 |  |  | December 31, 2019 |
Total |  | $ | 11 |  |  | $ | 26 |
Summary of Property Plant Equipment And Right Of Use Assets | Total PP&E including Oil and Gas assets, Facilities, Corporate assets and Right-of-use assets is as follows:
|  | As at |
PP&E |  | September 30, 2020 |  |  | December 31, 2019 |
Oil and Gas assets, Facilities, Corporate assets |  | $ | 898 |  |  | $ | 1,679 |
Right-of-use assets |  |  | 11 |  |  |  | 26 |
Total |  | $ | 909 |  |  | $ | 1,705 |

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