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INCOME TAXES (Tables) | 12 Months Ended
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Dec. 31, 2017
Income Taxes [Abstract] |
Schedule of provision for income tax | The provision for income tax was as follows:
Expense (recovery) |  | 2017 |  |  | 2016 |  |  | 2015 |
Current corporate income tax – North America |  | $ | (145 | ) |  | $ | (377 | ) |  | $ | 86 |
Current corporate income tax – North Sea |  | 57 |  |  | (74 | ) |  | (117 | )
Current corporate income tax – Offshore Africa |  | 45 |  |  | 22 |  |  | 17 |
Current PRT (1) – North Sea |  | (132 | ) |  | (198 | ) |  | (258 | )
Other taxes |  | 11 |  |  | 9 |  |  | 11 |
Current income tax |  | (164 | ) |  | (618 | ) |  | (261 | )
Deferred corporate income tax |  | 586 |  |  | (106 | ) |  | 216 |
Deferred PRT (1) – North Sea |  | 54 |  |  | (135 | ) |  | 15 |
Deferred income tax |  | 640 |  |  | (241 | ) |  | 231 |
Income tax |  | $ | 476 |  |  | $ | (859 | ) |  | $ | (30 | )
(1) Petroleum Revenue Tax.
Schedule of provision for income tax reconciliation | The provision for income tax is different from the amount computed by applying the combined statutory Canadian federal and provincial income tax rates to earnings (loss) before taxes. The reasons for the difference are as follows:
|  | 2017 |  |  | 2016 |  |  | 2015 |
Canadian statutory income tax rate |  | 27.0% |  |  | 27.0% |  |  | 26.0% |
Income tax provision at statutory rate |  | $ | 776 |  |  | $ | (287 | ) |  | $ | (173 | )
Effect on income taxes of: |  |  |  |  |  |  |  |  |
UK PRT and other taxes |  | (67 | ) |  | (324 | ) |  | (232 | )
Impact of deductible UK PRT and other taxes on corporate income tax |  | 28 |  |  | 131 |  |  | 119 |
Foreign and domestic tax rate differentials |  | (43 | ) |  | (54 | ) |  | (157 | )
Non-taxable portion of capital gains/losses |  | (86 | ) |  | (80 | ) |  | 36 |
Stock options exercised for common shares |  | 33 |  |  | 94 |  |  | (12 | )
Income tax rate and other legislative changes |  | 10 |  |  | (107 | ) |  | 362 |
Non-taxable gain on corporate acquisitions |  | (63 | ) |  | — |  |  | — |
Revisions arising from prior year tax filings |  | (3 | ) |  | (120 | ) |  | 32 |
Change in unrecognized capital loss carryforward asset |  | (86 | ) |  | (80 | ) |  | 36 |
Other |  | (23 | ) |  | (32 | ) |  | (41 | )
Income tax expense (recovery) |  | $ | 476 |  |  | $ | (859 | ) |  | $ | (30 | )
Summary of major temporary differences, movements in deferred tax assets and liabilities, and net deferred income tax liability | The following table summarizes the temporary differences that give rise to the net deferred income tax liability:
|  | 2017 |  |  | 2016 |
Deferred income tax liabilities |  |  |  |
Property, plant and equipment and exploration and evaluation assets |  | $ | 12,484 |  |  | $ | 10,259 |
Unrealized risk management activities |  | 20 |  |  | 62 |
PRT deduction for corporate income tax |  | 7 |  |  | 29 |
Investments |  | 96 |  |  | 98 |
Investment in North West Redwater Partnership |  | 252 |  |  | 222 |
|  | 12,859 |  |  | 10,670 |
Deferred income tax assets |  |  |  |  |  |
Asset retirement obligations |  | (1,264 | ) |  | (983 | )
Loss carryforwards |  | (523 | ) |  | (390 | )
Unrealized foreign exchange loss on long-term debt |  | (29 | ) |  | (149 | )
Deferred PRT |  | (18 | ) |  | (73 | )
Other |  | (50 | ) |  | (2 | )
|  | (1,884 | ) |  | (1,597 | )
Net deferred income tax liability |  | $ | 10,975 |  |  | $ | 9,073 |
Movements in deferred tax assets and liabilities recognized in net earnings during the year were as follows:
|  | 2017 |  |  | 2016 |  |  | 2015 |
Property, plant and equipment and exploration and evaluation assets |  | $ | 541 |  |  | $ | 37 |  |  | $ | (7 | )
Timing of partnership items |  | — |  |  | (261 | ) |  | (176 | )
Unrealized foreign exchange loss (gain) on long-term debt |  | 120 |  |  | 63 |  |  | (222 | )
Unrealized risk management activities |  | (46 | ) |  | (44 | ) |  | (5 | )
Asset retirement obligations |  | (88 | ) |  | (20 | ) |  | 522 |
Loss carryforwards |  | 48 |  |  | (221 | ) |  | (53 | )
Investments |  | (2 | ) |  | 38 |  |  | 60 |
Investment in North West Redwater Partnership |  | 30 |  |  | 81 |  |  | 106 |
Deferred PRT |  | 54 |  |  | (135 | ) |  | 15 |
PRT deduction for corporate income tax |  | (21 | ) |  | 61 |  |  | (5 | )
Other |  | 4 |  |  | 160 |  |  | (4 | )
|  | $ | 640 |  |  | $ | (241 | ) |  | $ | 231 |
The following table summarizes the movements of the net deferred income tax liability during the year:
|  | 2017 |  |  | 2016 |  |  | 2015 |
Balance – beginning of year |  | $ | 9,073 |  |  | $ | 9,344 |  |  | $ | 8,970 |
Deferred income tax expense (recovery) |  | 640 |  |  | (241 | ) |  | 231 |
Deferred income tax expense (recovery) included in other comprehensive income |  | 4 |  |  | (5 | ) |  | (4 | )
Foreign exchange adjustments |  | (29 | ) |  | (25 | ) |  | 147 |
Business combinations (note 7) |  | 1,287 |  |  | — |  |  | — |
Balance – end of year |  | $ | 10,975 |  |  | $ | 9,073 |  |  | $ | 9,344 |

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