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Other Long-Term Liabilities - Asset Retirement Obligations (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure of other provisions [line items] |  |  |
Asset retirement obligations settlement period | 60 years |  |
Inflation rate | 2.00% | 2.00% |
Reconciliation Of Changes In Provision For Decommissioning Restoration And Rehabilitation Costs [Roll Forward] |  |  |
Balance – beginning of year | $ 5,861 | $ 5,771 | $ 3,886
Balance – end of year | 6,806 | 5,861 | 5,771
Less: current portion | 249 | 184 | 208
Non-current asset retirement obligation | $ 6,557 | $ 5,677 | $ 5,563
Provision for decommissioning, restoration and rehabilitation costs |  |  |
Disclosure of other provisions [line items] |  |  |
Weighted average discount rate | 4.00% | 3.70% | 3.80%
Reconciliation Of Changes In Provision For Decommissioning Restoration And Rehabilitation Costs [Roll Forward] |  |  |
Liabilities incurred | $ 5 | $ 5 | $ 15
Liabilities acquired, net | 76 | 13 | 198
Liabilities settled | (307) | (249) | (296)
Asset retirement obligation accretion | 185 | 205 | 190
Revision of cost and timing estimates | 1,716 | (134) | 412
Change in discount rates | (723) | 253 | 1,412
Foreign exchange adjustments | $ (7) | $ (3) | $ (46)

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- Definition The increase in other provisions resulting from acquisitions through business combinations. [Refer: Business combinations [member]; Other provisions] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 37 -IssueDate 2021-01-01 -Paragraph 84 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=37&code=ifrs-tx-2021-en-r&anchor=para_84&doctype=Standard -URIDate 2021-03-24 + Details
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