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Asset Impairment And Derecognition (Details) - CAD CAD in Millions | 3 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Jun. 30, 2016 | Dec. 31, 2017
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |
Exploration and evaluation | CAD 2,038.0 |  | CAD 2,052.0
Property, plant and equipment, net | 71,259.0 |  | 73,493.0
Current inventories | CAD 3,240.0 |  | CAD 3,468.0
Risk adjusted discount rate | 8.00% |  | 8.00%
Oil Sands |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |
Impairment loss | CAD 40.0 |  |
Property, plant and equipment, net | 54,541.0 |  | CAD 56,961.0
Exploration and Production |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |
Property, plant and equipment, net | 8,038.0 |  | 8,017.0
Oil and Gas properties |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |
Property, plant and equipment, net | 18,079.0 |  | 18,234.0
Norway | Exploration and Evaluation Assets. |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |
Impairment loss |  | CAD 33.0 |
Taxes on impairment |  | CAD 119.0 |
Corporate Energy Trading And Eliminations |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |
Impairment loss | 31.0 |  |
Property, plant and equipment, net | CAD 302.0 |  | CAD 284.0

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- Definition The discount rate applied to cash flow projections for a cash-generating unit (group of units). [Refer: Cash-generating units [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2017-01-01 -Paragraph 134 -Subparagraph d -Clause v -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2017-03-01&anchor=para_134_d_v&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2017-01-01 -Paragraph 134 -Subparagraph e -Clause v -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2017-03-01&anchor=para_134_e_v&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount recognised as a reduction of the carrying amount of an asset or cash-generating unit to its recoverable amount. [Refer: Carrying amount [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2017-01-01 -Paragraph 130 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2017-03-01&anchor=para_130_b&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2017-01-01 -Paragraph 130 -Subparagraph d -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2017-03-01&anchor=para_130_d_ii&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of exploration and evaluation assets recognised as intangible assets in accordance with the entity's accounting policy. [Refer: Exploration and evaluation assets [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 6 -IssueDate 2017-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=6&date=2017-03-01&anchor=para_25&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 38 -IssueDate 2017-01-01 -Paragraph 119 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2017-03-01&anchor=para_119&doctype=Standard -URIDate 2017-03-09 + Details
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