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Exploration And Evaluation Assets (Tables) | 12 Months Ended
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Dec. 31, 2017
EXPLORATION AND EVALUATION ASSETS |
Exploration and Evaluation Assets rollforward |
($ millions) |  | 2017 |  | 2016 |  |
Beginning of year |  | 2 038 |  | 1 681 |  |
Acquisitions and additions (notes 7, 8 and 34) |  | 53 |  | 787 |  |
Transfers to oil and gas assets |  | — |  | (65 | ) |
Dry hole expenses |  | (41 | ) | (204 | ) |
Impairment (note 11) |  | — |  | (152 | ) |
Amortization |  | (1 | ) | (1 | ) |
Foreign exchange adjustments |  | 3 |  | (8 | ) |
End of year |  | 2 052 |  | 2 038 |  |

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