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Property Plant And Equipment (Details) - CAD CAD in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Reconciliation of changes in property, plant and equipment [abstract] |  |
Balance at the beginning | CAD 71,259.0 |
Balance at the end | 73,493.0 | CAD 71,259.0
Cost |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Balance at the beginning | 107,678.0 | 93,712.0
Additions | 7,110.0 | 6,570.0
Transfers from exploration and evaluation |  | 65.0
Acquisitions | 335.0 | 10,806.0
Changes in decommissioning and restoration | 843.0 | (47.0)
Disposals and derecognition | (884.0) | (969.0)
Foreign exchange adjustments | (269.0) | (1,552.0)
Reclassified to assets held for sale |  | (907.0)
Reclassified from assets held for sale | (35.0) |
Balance at the end | 114,848.0 | 107,678.0
Accumulated provision |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Balance at the beginning | (36,419.0) | (32,561.0)
Disposals and derecognition | 368.0 | 645.0
Foreign exchange adjustments | 129.0 | 1,033.0
Reclassified to assets held for sale | (3.0) |
Reclassified from assets held for sale |  | (195.0)
Depreciation and depletion | (5,430.0) | (5,731.0)
Balance at the end | (41,355.0) | (36,419.0)
Oil and Gas properties |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Balance at the beginning | 18,079.0 |
Balance at the end | 18,234.0 | 18,079.0
Oil and Gas properties | Cost |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Balance at the beginning | 34,141.0 | 32,635.0
Additions | 1,235.0 | 1,428.0
Transfers from exploration and evaluation |  | 65.0
Acquisitions | 25.0 | 1,678.0
Changes in decommissioning and restoration | 821.0 | (68.0)
Disposals and derecognition |  | (166.0)
Foreign exchange adjustments | (13.0) | (1,431.0)
Balance at the end | 36,209.0 | 34,141.0
Oil and Gas properties | Accumulated provision |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Balance at the beginning | (16,062.0) | (14,442.0)
Foreign exchange adjustments | 3.0 | 978.0
Depreciation and depletion | (1,916.0) | (2,598.0)
Balance at the end | (17,975.0) | (16,062.0)
Plant and Equipment |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Balance at the beginning | 53,180.0 |
Balance at the end | 55,259.0 | 53,180.0
Plant and Equipment | Cost |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Balance at the beginning | 73,537.0 | 61,077.0
Additions | 5,875.0 | 5,142.0
Acquisitions | 310.0 | 9,128.0
Changes in decommissioning and restoration | 22.0 | 21.0
Disposals and derecognition | (884.0) | (803.0)
Foreign exchange adjustments | (256.0) | (121.0)
Reclassified to assets held for sale |  | (907.0)
Reclassified from assets held for sale | (35.0) |
Balance at the end | 78,639.0 | 73,537.0
Plant and Equipment | Accumulated provision |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Balance at the beginning | (20,357.0) | (18,119.0)
Disposals and derecognition | 368.0 | 645.0
Foreign exchange adjustments | 126.0 | 55.0
Reclassified to assets held for sale | (3.0) |
Reclassified from assets held for sale |  | (195.0)
Depreciation and depletion | (3,514.0) | (3,133.0)
Balance at the end | CAD (23,380.0) | CAD (20,357.0)

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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 2017-01-01 -Paragraph 73 -Subparagraph e -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_73_e_iii&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of additions to property, plant and equipment other than those acquired 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 2017-01-01 -Paragraph 73 -Subparagraph e -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_73_e_i&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The decrease in property, plant and equipment through classification as held for sale or inclusion in a disposal group classified as held for sale. [Refer: Disposal groups classified as held for sale [member]; Property, plant and equipment; Disposal groups classified as held for sale [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2017-01-01 -Paragraph 73 -Subparagraph e -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_73_e_ii&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of depreciation of property, plant and equipment. [Refer: Depreciation and amortisation expense; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2017-01-01 -Paragraph 73 -Subparagraph e -Clause vii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_73_e_vii&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2017-01-01 -Paragraph 75 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_75_a&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The increase (decrease) in property, plant and equipment resulting from net exchange differences arising on the translation of the financial statements from the functional currency into a different presentation currency, including the translation of a foreign operation into the presentation currency of the reporting entity. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2017-01-01 -Paragraph 73 -Subparagraph e -Clause viii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_73_e_viii&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of tangible assets that: (a) are held for use in the production or supply of goods or services, for rental to others, or for administrative purposes; and (b) are expected to be used during more than one period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2017-01-01 -Paragraph 73 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_73_e&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 54 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_54_a&doctype=Standard -URIDate 2017-03-09 + Details
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