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Right of Use Assets - Reconciliation of changes of the right of use assets (Details) - CAD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Jun. 30, 2021 | Dec. 31, 2021 | Dec. 31, 2020
Right-Of-Use Assets [Roll Forward] |  |  |
Right-of-use assets, beginning balance |  | $ 141 | $ 146
Additions to right-of-use assets |  | 1 | 16
Depreciation, right-of-use assets |  | (11) | (21)
Acquisitions (Note 4) |  | 13 |
Disposal of assets (Note 4) |  | (41) |
Transfers |  | (8) |
Right-of-use assets, ending balance |  | 95 | 141
Land |  |  |
Right-Of-Use Assets [Roll Forward] |  |  |
Right-of-use assets, beginning balance |  | 58 | 58
Additions to right-of-use assets |  | 0 | 3
Depreciation, right-of-use assets |  | (3) | (3)
Acquisitions (Note 4) |  | 13 |
Disposal of assets (Note 4) |  | 0 |
Transfers |  | 0 |
Right-of-use assets, ending balance |  | 68 | 58
Buildings |  |  |
Right-Of-Use Assets [Roll Forward] |  |  |
Right-of-use assets, beginning balance |  | 24 | 16
Additions to right-of-use assets |  | 1 | 13
Depreciation, right-of-use assets |  | (5) | (5)
Acquisitions (Note 4) |  | 0 |
Disposal of assets (Note 4) |  | 0 |
Transfers |  | 0 |
Right-of-use assets, ending balance |  | 20 | 24
Vehicles |  |  |
Right-Of-Use Assets [Roll Forward] |  |  |
Right-of-use assets, beginning balance |  | 1 | 2
Additions to right-of-use assets |  | 0 | 0
Depreciation, right-of-use assets |  | 0 | (1)
Acquisitions (Note 4) |  | 0 |
Disposal of assets (Note 4) |  | 0 |
Transfers |  | 0 |
Right-of-use assets, ending balance |  | 1 | 1
Equipment |  |  |
Right-Of-Use Assets [Roll Forward] |  |  |
Right-of-use assets, beginning balance |  | 16 | 25
Additions to right-of-use assets |  | 0 | 0
Depreciation, right-of-use assets |  | (2) | (9)
Acquisitions (Note 4) |  | 0 |
Disposal of assets (Note 4) |  | 0 |
Transfers |  | (8) |
Right-of-use assets, ending balance |  | 6 | 16
Pipeline |  |  |
Right-Of-Use Assets [Roll Forward] |  |  |
Right-of-use assets, beginning balance |  | 42 | 45
Additions to right-of-use assets |  | 0 | 0
Depreciation, right-of-use assets |  | (1) | (3)
Acquisitions (Note 4) |  | 0 |
Decrease through derecognition, financial assets | $ 41 |  |
Transfers |  | 0 |
Right-of-use assets, ending balance |  | $ 0 | $ 42

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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 -Name IFRS -Number 16 -IssueDate 2021-01-01 -Paragraph 53 -Subparagraph h -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2021-en-r&anchor=para_53_h&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The decrease in financial assets resulting from derecognition. [Refer: Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph IG20B -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_IG20B&doctype=Implementation%20Guidance -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 35I -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_35I_c&doctype=Standard -URIDate 2021-03-24 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 35H -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_35H&doctype=Standard -URIDate 2021-03-24 + 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 -Name IFRS -Number 16 -IssueDate 2021-01-01 -Paragraph 53 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2021-en-r&anchor=para_53_a&doctype=Standard -URIDate 2021-03-24 + 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 -Name IFRS -Number 16 -IssueDate 2021-01-01 -Paragraph 53 -Subparagraph j -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2021-en-r&anchor=para_53_j&doctype=Standard -URIDate 2021-03-24 + 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 -Name IFRS -Number 16 -IssueDate 2021-01-01 -Paragraph 57 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2021-en-r&anchor=para_57&doctype=Standard -URIDate 2021-03-24 + Details
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