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Goodwill And Other Intangible Assets (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 CAD ($) $ / bbl | Dec. 31, 2017 CAD ($)
Changes in intangible assets other than goodwill [abstract] |  |
Balance at beginning of period | $ 3,061 | $ 3,075
Disposals |  | (13)
Amortization | (4) | (3)
Additions | 4 | 2
Balance at end of period | $ 3,061 | $ 3,061
After tax discount rate applied to cash flow projections | 8.00% | 8.00%
Projected West Texas Intermediate price prices for 2019 | $ / bbl | 58.00 |
Projected West Texas Intermediate price prices for 2020 | $ / bbl | 70.40 |
Projected West Texas Intermediate price prices for 2021 | $ / bbl | 75.30 |
Projected West Texas Intermediate price prices for 2022 | $ / bbl | 80.10 |
Average growth rate from 2023 - 2024 | 3.00% |
Average growth rate after 2024 | 2.00% |
Inflation rate | 2.00% |
Goodwill impairment | $ 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% | 12.00%
Cash flow forecast period | P50Y |
Oil Sands |  |
Changes in intangible assets other than goodwill [abstract] |  |
Goodwill impairment | $ 0 |
Oil Sands | Goodwill |  |
Changes in intangible assets other than goodwill [abstract] |  |
Balance at beginning of period | 2,752 | $ 2,752
Balance at end of period | 2,752 | 2,752
Refining and Marketing | Goodwill |  |
Changes in intangible assets other than goodwill [abstract] |  |
Balance at beginning of period | 140 | 148
Disposals |  | (8)
Balance at end of period | 140 | 140
Refining and Marketing | Brand Name |  |
Changes in intangible assets other than goodwill [abstract] |  |
Balance at beginning of period | 162 | 166
Disposals |  | (4)
Balance at end of period | 162 | 162
Refining and Marketing | Customer Lists |  |
Changes in intangible assets other than goodwill [abstract] |  |
Balance at beginning of period | 7 | 9
Disposals |  | (1)
Amortization | (4) | (3)
Additions | 4 | 2
Balance at end of period | $ 7 | $ 7

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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 2018-01-01 -Paragraph 118 -Subparagraph e -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2018-03-01&anchor=para_118_e_i&doctype=Standard -URIDate 2018-03-16 + 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 2018-01-01 -Paragraph 118 -Subparagraph e -Clause vi -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2018-03-01&anchor=para_118_e_vi&doctype=Standard -URIDate 2018-03-16 + 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 2018-01-01 -Paragraph 134 -Subparagraph d -Clause v -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2018-03-01&anchor=para_134_d_v&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2018-01-01 -Paragraph 134 -Subparagraph e -Clause v -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2018-03-01&anchor=para_134_e_v&doctype=Standard -URIDate 2018-03-16 + 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 2018-01-01 -Paragraph 134 -Subparagraph d -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2018-03-01&anchor=para_134_d_iii&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2018-01-01 -Paragraph 134 -Subparagraph e -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2018-03-01&anchor=para_134_e_iii&doctype=Standard -URIDate 2018-03-16 + 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 2018-01-01 -Paragraph B67 -Subparagraph d -Clause v -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=3&date=2018-03-01&anchor=para_B67_d_v&doctype=Appendix&seq=2 -URIDate 2018-03-16 + Details
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