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Income Taxes - Schedule of Movement in Deferred Income Tax Liabilities and Assets (Detail) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Reconciliation Of Changes In Deferred Tax Liability Asset [Line Items] |  |
Deferred Income Tax Liabilities, Beginning Balance | $ 4,146 | $ 4,543
Deferred Income Tax Assets, Beginning Balance | (948) | (511)
Net Deferred Income Tax Liabilities, Beginning Balance | 3,198 | 4,032
Deferred Income Tax Liabilities, Ending Balance | 4,046 | 4,146
Deferred Income Tax Assets, Ending Balance | (1,454) | (948)
Net Deferred Income Tax Liabilities, Ending Balance | 2,592 | 3,198
Unused Tax Losses |  |
Reconciliation Of Changes In Deferred Tax Liability Asset [Line Items] |  |
Deferred Income Tax Assets, Beginning Balance | (659) | (225)
Deferred Income Tax Assets, Ending Balance | (655) | (659)
Deferred Income Tax Liabilities |  |
Reconciliation Of Changes In Deferred Tax Liability Asset [Line Items] |  |
Charged (Credited) to Earnings | (159) | (390)
Charged (Credited) to OCI | 59 | (7)
Deferred Income Tax Assets |  |
Reconciliation Of Changes In Deferred Tax Liability Asset [Line Items] |  |
Charged (Credited) to Earnings | 611 | (448)
Charged (Credited) to Purchase Price Allocation | (1,121) |
Charged (Credited) to OCI | 4 | 11
Deferred Income Tax Assets | Unused Tax Losses |  |
Reconciliation Of Changes In Deferred Tax Liability Asset [Line Items] |  |
Charged (Credited) to Earnings | 668 | (448)
Charged (Credited) to Purchase Price Allocation | (656) |
Charged (Credited) to OCI | (8) | 14
Net Deferred Income Tax Liabilities |  |
Reconciliation Of Changes In Deferred Tax Liability Asset [Line Items] |  |
Charged (Credited) to Earnings | 452 | (838)
Charged (Credited) to Purchase Price Allocation | (1,062) |
Charged (Credited) to OCI | 4 | 4
PP&E |  |
Reconciliation Of Changes In Deferred Tax Liability Asset [Line Items] |  |
Deferred Income Tax Liabilities, Beginning Balance | 4,124 | 4,498
Deferred Income Tax Liabilities, Ending Balance | 3,949 | 4,124
PP&E | Deferred Income Tax Liabilities |  |
Reconciliation Of Changes In Deferred Tax Liability Asset [Line Items] |  |
Charged (Credited) to Earnings | (234) | (367)
Charged (Credited) to OCI | 59 | (7)
Risk Management |  |
Reconciliation Of Changes In Deferred Tax Liability Asset [Line Items] |  |
Deferred Income Tax Liabilities, Beginning Balance | 0 | 1
Deferred Income Tax Assets, Beginning Balance | (13) | (1)
Deferred Income Tax Liabilities, Ending Balance | 0 | 0
Deferred Income Tax Assets, Ending Balance | (11) | (13)
Risk Management | Deferred Income Tax Liabilities |  |
Reconciliation Of Changes In Deferred Tax Liability Asset [Line Items] |  |
Charged (Credited) to Earnings | 0 | (1)
Charged (Credited) to OCI | 0 | 0
Risk Management | Deferred Income Tax Assets |  |
Reconciliation Of Changes In Deferred Tax Liability Asset [Line Items] |  |
Charged (Credited) to Earnings | 1 | (12)
Charged (Credited) to Purchase Price Allocation | 1 |
Charged (Credited) to OCI | 0 | 0
Other |  |
Reconciliation Of Changes In Deferred Tax Liability Asset [Line Items] |  |
Deferred Income Tax Liabilities, Beginning Balance | 22 | 44
Deferred Income Tax Assets, Beginning Balance | (276) | (285)
Deferred Income Tax Liabilities, Ending Balance | 97 | 22
Deferred Income Tax Assets, Ending Balance | (788) | (276)
Other | Deferred Income Tax Liabilities |  |
Reconciliation Of Changes In Deferred Tax Liability Asset [Line Items] |  |
Charged (Credited) to Earnings | 75 | (22)
Charged (Credited) to OCI | 0 | 0
Other | Deferred Income Tax Assets |  |
Reconciliation Of Changes In Deferred Tax Liability Asset [Line Items] |  |
Charged (Credited) to Earnings | (58) | 12
Charged (Credited) to Purchase Price Allocation | (466) |
Charged (Credited) to OCI | $ 12 | $ (3)

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- Definition The amounts of income taxes recoverable in future periods in respect of: (a) deductible temporary differences; (b) the carryforward of unused tax losses; and (c) the carryforward of unused tax credits. [Refer: Temporary differences [member]; Unused tax credits [member]; Unused tax losses [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2021-01-01 -Paragraph 81 -Subparagraph g -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2021-en-r&anchor=para_81_g_i&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 54 -Subparagraph o -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_54_o&doctype=Standard -URIDate 2021-03-24 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 56 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_56&doctype=Standard -URIDate 2021-03-24 + Details
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