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Goodwill And Other Intangible Assets (Details) CAD in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 CAD $ / bbl | Dec. 31, 2016 CAD
Changes in intangible assets other than goodwill [abstract] |  |
Balance at beginning of period | CAD 3,075.0 | CAD 3,079.0
Amortization | (3.0) | (4.0)
Disposals | (13.0) |
Additions | 2.0 |
Balance at end of period | CAD 3,061.0 | CAD 3,075.0
After tax discount rate applied to cash flow projections | 8.00% | 8.00%
Projected West Texas Intermediate price prices for 2018 | $ / bbl | 61.00 |
Projected West Texas Intermediate price prices for 2019 | $ / bbl | 68.60 |
Projected West Texas Intermediate price prices for 2020 | $ / bbl | 76.65 |
Average growth rate from 2021 - 2023 | 4.00% |
Average growth rate after 2023 | 2.00% |
Inflation rate | 2.00% |
Goodwill impairment | CAD 0.0 |
Minimum |  |
Changes in intangible assets other than goodwill [abstract] |  |
After tax discount rate applied to cash flow projections | 10.00% | 10.00%
Cash flow forecast period | P20Y |
Maximum |  |
Changes in intangible assets other than goodwill [abstract] |  |
After tax discount rate applied to cash flow projections | 12.00% | 15.00%
Cash flow forecast period | P50Y |
Oil Sands |  |
Changes in intangible assets other than goodwill [abstract] |  |
Goodwill impairment | CAD 0.0 |
Oil Sands | Goodwill |  |
Changes in intangible assets other than goodwill [abstract] |  |
Balance at beginning of period | 2,752.0 | CAD 2,752.0
Balance at end of period | 2,752.0 | 2,752.0
Refining and Marketing | Goodwill |  |
Changes in intangible assets other than goodwill [abstract] |  |
Balance at beginning of period | 148.0 | 148.0
Disposals | (8.0) |
Balance at end of period | 140.0 | 148.0
Refining and Marketing | Brand Name |  |
Changes in intangible assets other than goodwill [abstract] |  |
Balance at beginning of period | 166.0 | 166.0
Disposals | (4.0) |
Balance at end of period | 162.0 | 166.0
Refining and Marketing | Customer Lists |  |
Changes in intangible assets other than goodwill [abstract] |  |
Balance at beginning of period | 9.0 | 13.0
Amortization | (3.0) | (4.0)
Disposals | (1.0) |
Additions | 2.0 |
Balance at end of period | CAD 7.0 | CAD 9.0

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- Definition The amount of additions to intangible assets other than goodwill, other than those acquired through business combinations. [Refer: Business combinations [member]; Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2017-01-01 -Paragraph 118 -Subparagraph e -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2017-03-01&anchor=para_118_e_i&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of amortisation of intangible assets other than goodwill. [Refer: Depreciation and amortisation expense; Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2017-01-01 -Paragraph 118 -Subparagraph e -Clause vi -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2017-03-01&anchor=para_118_e_vi&doctype=Standard -URIDate 2017-03-09 + Details
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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 explanation of the period over which management has projected cash flows based on financial budgets/forecasts approved by management including, when a period greater than five years is used for a cash-generating unit (group of units), an explanation of why that longer period is justified. [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 iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2017-03-01&anchor=para_134_d_iii&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 iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2017-03-01&anchor=para_134_e_iii&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of impairment loss recognised in profit or loss for goodwill. [Refer: Impairment loss recognised in profit or loss; Goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2017-01-01 -Paragraph B67 -Subparagraph d -Clause v -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=3&date=2017-03-01&anchor=para_B67_d_v&doctype=Appendix&seq=2 -URIDate 2017-03-09 + Details
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- Definition The amount of intangible assets and goodwill held by the entity. [Refer: Goodwill; Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_55&doctype=Standard -URIDate 2017-03-09 + Details
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