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INCOME TAXES - Deferred Income Tax Balances (Details) - CAD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred Income Tax (Recovery) Expense | $ 56 | $ (1,119) |
Deferred Income Tax Liability (Asset) | 9,081 | 8,758 | $ 9,967
Property, plant and equipment |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred Income Tax (Recovery) Expense | (260) | (1,084) |
Deferred Income Tax Liability (Asset) | 11,477 | 11,963 |
Decommissioning and Restoration |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred Income Tax (Recovery) Expense | 141 | 21 |
Deferred Income Tax Liability (Asset) | (1,936) | (2,304) |
Employee retirement benefit plans |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred Income Tax (Recovery) Expense | (142) | 34 |
Deferred Income Tax Liability (Asset) | (470) | (605) |
Tax loss carryforwards |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred Income Tax (Recovery) Expense | 161 | (20) |
Deferred Income Tax Liability (Asset) | (15) | (176) |
Other |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred Income Tax (Recovery) Expense | 156 | (70) |
Deferred Income Tax Liability (Asset) | $ 25 | $ (120) |

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