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Right of Use Assets - Reconciliation of changes of the right of use assets (Details) - CAD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2019
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |
Right-of-use assets | $ 146 | $ 0 |  |
Property, plant and equipment | 6,207 | 6,164 | $ 6,578 |
Change in foreign exchange rates | 0 | 5 | (7) |
Land |  |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |
Property, plant and equipment | 91 | 94 | $ 95 |
IFRS 16 |  |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |
Right-of-use assets | 146 | 52 |  | $ 85
Right-of-use assets, increase (decrease) in revaluation surplus |  | (5) |  |
Property, plant and equipment |  | 38 |  |
Additions to right-of-use assets | 81 |  |  |
Depreciation, right-of-use assets | (18) |  |  |
Change in foreign exchange rates | (1) |  |  |
Right-Of-Use Assets, Transfer | (1) |  |  |
IFRS 16 | Land |  |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |
Right-of-use assets | 58 | 29 |  | 28
Right-of-use assets, increase (decrease) in revaluation surplus |  | (1) |  |
Property, plant and equipment |  | 0 |  |
Additions to right-of-use assets | 32 |  |  |
Depreciation, right-of-use assets | (1) |  |  |
Change in foreign exchange rates | (1) |  |  |
Right-Of-Use Assets, Transfer | 0 |  |  |
IFRS 16 | Buildings |  |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |
Right-of-use assets | 16 | 22 |  | 18
Right-of-use assets, increase (decrease) in revaluation surplus |  | (4) |  |
Property, plant and equipment |  | 0 |  |
Additions to right-of-use assets | 2 |  |  |
Depreciation, right-of-use assets | (4) |  |  |
Change in foreign exchange rates | 0 |  |  |
Right-Of-Use Assets, Transfer | 0 |  |  |
IFRS 16 | Vehicles |  |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |
Right-of-use assets | 2 | 1 |  | 4
Right-of-use assets, increase (decrease) in revaluation surplus |  | 0 |  |
Property, plant and equipment |  | 3 |  |
Additions to right-of-use assets | 0 |  |  |
Depreciation, right-of-use assets | (2) |  |  |
Change in foreign exchange rates | 0 |  |  |
Right-Of-Use Assets, Transfer | 0 |  |  |
IFRS 16 | Equipment |  |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |
Right-of-use assets | 25 | 0 |  | 35
Right-of-use assets, increase (decrease) in revaluation surplus |  | 0 |  |
Property, plant and equipment |  | 35 |  |
Additions to right-of-use assets | 2 |  |  |
Depreciation, right-of-use assets | (11) |  |  |
Change in foreign exchange rates | 0 |  |  |
Right-Of-Use Assets, Transfer | (1) |  |  |
IFRS 16 | Pipeline |  |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |
Right-of-use assets | 45 | 0 |  | $ 0
Right-of-use assets, increase (decrease) in revaluation surplus |  | 0 |  |
Property, plant and equipment |  | $ 0 |  |
Additions to right-of-use assets | 45 |  |  |
Depreciation, right-of-use assets | 0 |  |  |
Change in foreign exchange rates | 0 |  |  |
Right-Of-Use Assets, Transfer | $ 0 |  |  |

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- Definition The amount of additions to right-of-use assets. [Refer: Right-of-use assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2019-01-01 -Name IFRS -Number 16 -IssueDate 2018-01-01 -Paragraph 53 -Subparagraph h -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=16&date=2018-03-01&anchor=para_53_h&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of depreciation of right-of-use assets. [Refer: Depreciation and amortisation expense; Right-of-use assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2019-01-01 -Name IFRS -Number 16 -IssueDate 2018-01-01 -Paragraph 53 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=16&date=2018-03-01&anchor=para_53_a&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The increase (decrease) in financial assets resulting from foreign exchange. [Refer: Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph IG20B -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_IG20B&doctype=Implementation%20Guidance -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 35H -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_35H&doctype=Standard -URIDate 2018-03-16 + 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 2018-01-01 -Paragraph 73 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2018-03-01&anchor=para_73_e&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 54 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_54_a&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of assets that represent a lessee's right to use an underlying asset for the lease term. Underlying asset is an asset that is the subject of a lease, for which the right to use that asset has been provided by a lessor to a lessee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2019-01-01 -Name IFRS -Number 16 -IssueDate 2018-01-01 -Paragraph 53 -Subparagraph j -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=16&date=2018-03-01&anchor=para_53_j&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The increase (decrease) in the revaluation surplus that relates to right-of-use assets. [Refer: Revaluation surplus; Right-of-use assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2019-01-01 -Name IFRS -Number 16 -IssueDate 2018-01-01 -Paragraph 57 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=16&date=2018-03-01&anchor=para_57&doctype=Standard -URIDate 2018-03-16 + Details
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