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Property, Plant and Equipment - Detailed information about property, plant and equipment (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Beginning balance | $ (64,559) |  |
Ending balance | (68,043) | $ (64,559) |
Revaluation pre-tax gain |  | 19 |
Cost |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Beginning balance | (123,822) | (119,749) |
Additions | 5,393 | 3,961 |
Acquisition of Devon assets | 3,325 |  |
Transfers from E&E assets | 219 | 397 |
Disposals/derecognitions | (2,340) | (1,394) |
Foreign exchange adjustments and other | 630 | (1,109) |
Ending balance | (129,789) | (123,822) | $ (119,749)
Accumulated depletion and depreciation |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Beginning balance | 59,263 | 54,579 |
Disposals/derecognitions | 2,340 | 1,375 |
Foreign exchange adjustments and other | (464) | 898 |
Expense | 5,287 | 5,161 |
Ending balance | 61,746 | 59,263 | 54,579
North Sea |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Additions |  | 108 |
Revaluation pre-tax gain |  | 19 |
Midstream and Refining |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Revaluation pre-tax gain |  |  | 114
Operating segments | North America |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Beginning balance | (23,126) |  |
Ending balance | (26,050) | (23,126) |
Operating segments | North America | Cost |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Beginning balance | (67,007) | (64,816) |
Additions | 2,613 | 2,428 |
Acquisition of Devon assets | 3,325 |  |
Transfers from E&E assets | 219 | 175 |
Disposals/derecognitions | (537) | (412) |
Foreign exchange adjustments and other | 0 | 0 |
Ending balance | (72,627) | (67,007) | (64,816)
Operating segments | North America | Accumulated depletion and depreciation |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Beginning balance | 43,881 | 41,151 |
Disposals/derecognitions | 537 | 393 |
Foreign exchange adjustments and other | 18 | 12 |
Expense | 3,215 | 3,111 |
Ending balance | 46,577 | 43,881 | 41,151
Operating segments | North Sea |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Beginning balance | (1,586) |  |
Ending balance | (1,584) | (1,586) |
Operating segments | North Sea | Cost |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Beginning balance | (7,321) | (7,126) |
Additions | 349 | 237 |
Acquisition of Devon assets | 0 |  |
Transfers from E&E assets | 0 | 0 |
Disposals/derecognitions | 0 | (703) |
Foreign exchange adjustments and other | 374 | (661) |
Ending balance | (7,296) | (7,321) | (7,126)
Operating segments | North Sea | Accumulated depletion and depreciation |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Beginning balance | 5,735 | 5,653 |
Disposals/derecognitions | 0 | 703 |
Foreign exchange adjustments and other | (279) | 528 |
Expense | 256 | 257 |
Ending balance | 5,712 | 5,735 | 5,653
Operating segments | Offshore Africa |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Beginning balance | (1,268) |  |
Ending balance | (1,221) | (1,268) |
Operating segments | Offshore Africa | Cost |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Beginning balance | (5,471) | (4,881) |
Additions | 233 | 212 |
Acquisition of Devon assets | 0 |  |
Transfers from E&E assets | 0 | 0 |
Disposals/derecognitions | (1,515) | (70) |
Foreign exchange adjustments and other | 256 | (448) |
Ending balance | (3,933) | (5,471) | (4,881)
Operating segments | Offshore Africa | Accumulated depletion and depreciation |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Beginning balance | 4,203 | 3,719 |
Disposals/derecognitions | 1,515 | 70 |
Foreign exchange adjustments and other | (190) | 353 |
Expense | 214 | 201 |
Ending balance | 2,712 | 4,203 | 3,719
Operating segments | Oil Sands Mining and Upgrading |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Beginning balance | (38,166) |  |
Ending balance | (38,769) | (38,166) |
Operating segments | Oil Sands Mining and Upgrading | Cost |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Beginning balance | (43,147) | (42,084) |
Additions | 2,154 | 1,050 |
Acquisition of Devon assets | 0 |  |
Transfers from E&E assets | 0 | 222 |
Disposals/derecognitions | (285) | (209) |
Foreign exchange adjustments and other | 0 | 0 |
Ending balance | (45,016) | (43,147) | (42,084)
Operating segments | Oil Sands Mining and Upgrading | Accumulated depletion and depreciation |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Beginning balance | 4,981 | 3,628 |
Disposals/derecognitions | 285 | 209 |
Foreign exchange adjustments and other | (13) | 5 |
Expense | 1,564 | 1,557 |
Ending balance | 6,247 | 4,981 | 3,628
Operating segments | Midstream and Refining |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Beginning balance | (303) |  |
Ending balance | (298) | (303) |
Operating segments | Midstream and Refining | Cost |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Beginning balance | (441) | (428) |
Additions | 10 | 13 |
Acquisition of Devon assets | 0 |  |
Transfers from E&E assets | 0 | 0 |
Disposals/derecognitions | 0 | 0 |
Foreign exchange adjustments and other | 0 | 0 |
Ending balance | (451) | (441) | (428)
Operating segments | Midstream and Refining | Accumulated depletion and depreciation |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Beginning balance | 138 | 124 |
Disposals/derecognitions | 0 | 0 |
Foreign exchange adjustments and other | 0 | 0 |
Expense | 15 | 14 |
Ending balance | 153 | 138 | 124
Head office |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Beginning balance | (110) |  |
Ending balance | (121) | (110) |
Head office | Cost |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Beginning balance | (435) | (414) |
Additions | 34 | 21 |
Acquisition of Devon assets | 0 |  |
Transfers from E&E assets | 0 | 0 |
Disposals/derecognitions | (3) | 0 |
Foreign exchange adjustments and other | 0 | 0 |
Ending balance | (466) | (435) | (414)
Head office | Accumulated depletion and depreciation |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Beginning balance | 325 | 304 |
Disposals/derecognitions | 3 | 0 |
Foreign exchange adjustments and other | 0 | 0 |
Expense | 23 | 21 |
Ending balance | 345 | $ 325 | $ 304
GABON | Operating segments | Offshore Africa |  |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |  |
Disposals/derecognitions | $ 1,515 |  |

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- Definition The increase in property, plant and equipment resulting from acquisitions through business combinations. [Refer: Business combinations [member]; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2019-01-01 -Paragraph 73 -Subparagraph e -Clause iii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2019-en-r&anchor=para_73_e_iii&doctype=Standard -URIDate 2019-03-27 + Details
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