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Property, Plant and Equipment (Tables) | 12 Months Ended
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Dec. 31, 2019
Property, plant and equipment [abstract] |
Detailed information about property, plant and equipment |
| Exploration and Production |  | Oil Sands Mining and Upgrading |  |  | Midstream and Refining |  |  | Head Office |  |  | Total |
| North America |  |  | North Sea |  |  | Offshore Africa |  |  |  |  |  |  |  |  |
Cost |  |  |  |  |  |  |  |  |  |  |  |  |
At December 31, 2017 | $ | 64,816 |  |  | $ | 7,126 |  |  | $ | 4,881 |  |  | $ | 42,084 |  |  | $ | 428 |  |  | $ | 414 |  |  | $ | 119,749 |
Additions (1) | 2,428 |  |  | 237 |  |  | 212 |  |  | 1,050 |  |  | 13 |  |  | 21 |  |  | 3,961 |
Transfers from E&E assets | 175 |  |  | — |  |  | — |  |  | 222 |  |  | — |  |  | — |  |  | 397 |
Disposals/derecognitions and other | (412 | ) |  | (703 | ) |  | (70 | ) |  | (209 | ) |  | — |  |  | — |  |  | (1,394 | )
Foreign exchange adjustments and other | — |  |  | 661 |  |  | 448 |  |  | — |  |  | — |  |  | — |  |  | 1,109 |
At December 31, 2018 | 67,007 |  |  | 7,321 |  |  | 5,471 |  |  | 43,147 |  |  | 441 |  |  | 435 |  |  | 123,822 |
Additions | 2,613 |  |  | 349 |  |  | 233 |  |  | 2,154 |  |  | 10 |  |  | 34 |  |  | 5,393 |
Acquisition of Devon assets | 3,325 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 3,325 |
Transfers from E&E assets | 219 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 219 |
Disposals/derecognitions (2) | (537 | ) |  | — |  |  | (1,515 | ) |  | (285 | ) |  | — |  |  | (3 | ) |  | (2,340 | )
Foreign exchange adjustments and other | — |  |  | (374 | ) |  | (256 | ) |  | — |  |  | — |  |  | — |  |  | (630 | )
At December 31, 2019 | $ | 72,627 |  |  | $ | 7,296 |  |  | $ | 3,933 |  |  | $ | 45,016 |  |  | $ | 451 |  |  | $ | 466 |  |  | $ | 129,789 |
Accumulated depletion and depreciation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
At December 31, 2017 | $ | 41,151 |  |  | $ | 5,653 |  |  | $ | 3,719 |  |  | $ | 3,628 |  |  | $ | 124 |  |  | $ | 304 |  |  | $ | 54,579 |
Expense | 3,111 |  |  | 257 |  |  | 201 |  |  | 1,557 |  |  | 14 |  |  | 21 |  |  | 5,161 |
Disposals/derecognitions | (393 | ) |  | (703 | ) |  | (70 | ) |  | (209 | ) |  | — |  |  | — |  |  | (1,375 | )
Foreign exchange adjustments and other | 12 |  |  | 528 |  |  | 353 |  |  | 5 |  |  | — |  |  | — |  |  | 898 |
At December 31, 2018 | 43,881 |  |  | 5,735 |  |  | 4,203 |  |  | 4,981 |  |  | 138 |  |  | 325 |  |  | 59,263 |
Expense | 3,215 |  |  | 256 |  |  | 214 |  |  | 1,564 |  |  | 15 |  |  | 23 |  |  | 5,287 |
Disposals/derecognitions (2) | (537 | ) |  | — |  |  | (1,515 | ) |  | (285 | ) |  | — |  |  | (3 | ) |  | (2,340 | )
Foreign exchange adjustments and other | 18 |  |  | (279 | ) |  | (190 | ) |  | (13 | ) |  | — |  |  | — |  |  | (464 | )
At December 31, 2019 | $ | 46,577 |  |  | $ | 5,712 |  |  | $ | 2,712 |  |  | $ | 6,247 |  |  | $ | 153 |  |  | $ | 345 |  |  | $ | 61,746 |
Net book value |  |  |  |  |  |  |  |  |  |  |  |  |
- at December 31, 2019 | $ | 26,050 |  |  | $ | 1,584 |  |  | $ | 1,221 |  |  | $ | 38,769 |  |  | $ | 298 |  |  | $ | 121 |  |  | $ | 68,043 |
- at December 31, 2018 | $ | 23,126 |  |  | $ | 1,586 |  |  | $ | 1,268 |  |  | $ | 38,166 |  |  | $ | 303 |  |  | $ | 110 |  |  | $ | 64,559 |
(1) | Additions in North Sea during 2018 include a pre-tax revaluation gain of $19 million relating to acquisitions of its previously held interest.
(2) | Following demobilization of the FPSO at the Olowi field, Gabon in 2019, the Company derecognized property, plant and equipment and associated accumulated depletion and depreciation of $1,515 million.
Summary of net assets acquired and liabilities assumed | The following provides a summary of the net assets acquired relating to the acquisition:
Property, plant and equipment | $ | 3,325 |
Exploration and evaluation assets | 91 |
Inventory, prepaids and other long-term assets | 195 |
Accrued liabilities | (21 | )
Asset retirement obligations | (178 | )
Net assets acquired | $ | 3,412 |

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