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EXPLORATION AND EVALUATION ASSETS (Tables) | 12 Months Ended
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Dec. 31, 2020
EXPLORATION AND EVALUATION ASSETS |
Exploration and Evaluation Assets rollforward |
($ millions) |  | December 31 2020 |  | December 31 2019 |  |
Beginning of year |  | 2 428 |  | 2 319 |  |
Acquisitions and additions |  | 176 |  | 193 |  |
Transfers to oil and gas assets |  | (170 | ) | — |  |
Dry hole expenses |  | (80 | ) | (66 | ) |
Disposals and derecognition |  | (70 | ) | (16 | ) |
Foreign exchange adjustments |  | 2 |  | (2 | ) |
End of year |  | 2 286 |  | 2 428 |  |

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