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Other Long-Term Liabilities - Asset Retirement Obligations (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
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 | $ 6,908 | $ 6,806 | $ 5,861
Balance – end of year | 7,690 | 6,908 | 6,806
Less: current portion | 634 | 495 | 249
Non-current asset retirement obligation | 7,056 | 6,413 | 6,557
Deferred income tax expense (recovery) | (53) | 139 | (399)
Deferred income tax expense (recovery) | (53) | 139 | $ (399)
North Sea |  |  |
Reconciliation Of Changes In Provision For Decommissioning Restoration And Rehabilitation Costs [Roll Forward] |  |  |
Balance – beginning of year | 1,011 |  |
Balance – end of year | $ 1,441 | $ 1,011 |
Provision for decommissioning, restoration and rehabilitation costs |  |  |
Disclosure of other provisions [line items] |  |  |
Weighted average discount rate | 5.20% | 5.60% | 4.00%
Reconciliation Of Changes In Provision For Decommissioning Restoration And Rehabilitation Costs [Roll Forward] |  |  |
Liabilities incurred | $ 25 | $ 20 | $ 5
Liabilities acquired, net | 0 | 11 | 76
Liabilities settled | (509) | (449) | (307)
Asset retirement obligation accretion | 366 | 281 | 185
Revision of cost, inflation and timing estimates | 621 | 897 | 508
Impact of regulatory changes | 0 | 982 | 1,208
Change in discount rates | 314 | (1,698) | (723)
Foreign exchange adjustments | $ (35) | $ 58 | $ (7)

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