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EXPLORATION AND EVALUATION ASSETS (Tables) | 12 Months Ended
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Dec. 31, 2017
Exploration For And Evaluation Of Mineral Resources [Abstract] |
Detailed information about exploration and evaluation assets |
| Exploration and Production | Oil Sands Mining and Upgrading |  | Total |
| North America |  | North Sea |  | Offshore Africa |  |  |
Cost |  |  |  |  |
At December 31, 2015 | $ | 2,500 |  | $ | — |  | $ | 86 |  | $ | — |  | $ | 2,586 |
Additions | 20 |  | — |  | 9 |  | — |  | 29 |
Transfers to property, plant and equipment | (211 | ) | — |  | — |  | — |  | (211 | )
Disposals/derecognitions | (3 | ) | — |  | (18 | ) | — |  | (21 | )
Foreign exchange adjustments | — |  | — |  | (1 | ) | — |  | (1 | )
At December 31, 2016 | 2,306 |  | — |  | 76 |  | — |  | 2,382 |
Additions | 144 |  | — |  | 15 |  | — |  | 159 |
Acquisition of AOSP and other assets (note 7) | 31 |  | — |  | — |  | 259 |  | 290 |
Transfers to property, plant and equipment | (198 | ) | — |  | — |  | — |  | (198 | )
Disposals/derecognitions | (1 | ) | — |  | — |  | — |  | (1 | )
At December 31, 2017 | $ | 2,282 |  | $ | — |  | $ | 91 |  | $ | 259 |  | $ | 2,632 |

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