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Income Taxes - Schedule of Movement in Deferred Income Tax Liabilities and Assets (Detail) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Reconciliation Of Changes In Deferred Tax Liability Asset [Line Items] |  |
Deferred Income Tax Liabilities, Beginning Balance | $ 4,543 | $ 5,545
Deferred Income Tax Liabilities, Ending Balance | 4,146 | 4,543
Deferred Income Tax Assets, Beginning Balance | (511) | (684)
Deferred Income Tax Assets, Ending Balance | (948) | (511)
Net Deferred Income Tax Liabilities, Beginning Balance | 4,032 | 4,861
Net Deferred Income Tax Liabilities, Ending Balance | 3,198 | 4,032
Unused Tax Losses [Member] |  |
Reconciliation Of Changes In Deferred Tax Liability Asset [Line Items] |  |
Deferred Income Tax Assets, Beginning Balance | (225) | (357)
Deferred Income Tax Assets, Ending Balance | (659) | (225)
Deferred Income Tax Liabilities [Member] |  |
Reconciliation Of Changes In Deferred Tax Liability Asset [Line Items] |  |
Charged (Credited) to Earnings | (390) | (977)
Charged (Credited) to OCI | (7) | (25)
Deferred Income Tax Assets [Member] |  |
Reconciliation Of Changes In Deferred Tax Liability Asset [Line Items] |  |
Charged (Credited) to Earnings | (448) | 163
Charged (Credited) to OCI | 11 | 10
Deferred Income Tax Assets [Member] | Unused Tax Losses [Member] |  |
Reconciliation Of Changes In Deferred Tax Liability Asset [Line Items] |  |
Charged (Credited) to Earnings | (448) | 129
Charged (Credited) to OCI | 14 | 3
Net Deferred Income Tax Liabilities [Member] |  |
Reconciliation Of Changes In Deferred Tax Liability Asset [Line Items] |  |
Charged (Credited) to Earnings | (838) | (814)
Charged (Credited) to OCI | 4 | (15)
PP&E [Member] |  |
Reconciliation Of Changes In Deferred Tax Liability Asset [Line Items] |  |
Deferred Income Tax Liabilities, Beginning Balance | 4,498 | 5,450
Deferred Income Tax Liabilities, Ending Balance | 4,124 | 4,498
PP&E [Member] | Deferred Income Tax Liabilities [Member] |  |
Reconciliation Of Changes In Deferred Tax Liability Asset [Line Items] |  |
Charged (Credited) to Earnings | (367) | (927)
Charged (Credited) to OCI | (7) | (25)
Risk Management [Member] |  |
Reconciliation Of Changes In Deferred Tax Liability Asset [Line Items] |  |
Deferred Income Tax Liabilities, Beginning Balance | 1 | 44
Deferred Income Tax Liabilities, Ending Balance |  | 1
Deferred Income Tax Assets, Beginning Balance | (1) | (1)
Deferred Income Tax Assets, Ending Balance | (13) | (1)
Risk Management [Member] | Deferred Income Tax Liabilities [Member] |  |
Reconciliation Of Changes In Deferred Tax Liability Asset [Line Items] |  |
Charged (Credited) to Earnings | (1) | (43)
Risk Management [Member] | Deferred Income Tax Assets [Member] |  |
Reconciliation Of Changes In Deferred Tax Liability Asset [Line Items] |  |
Charged (Credited) to Earnings | (12) |
Other [Member] |  |
Reconciliation Of Changes In Deferred Tax Liability Asset [Line Items] |  |
Deferred Income Tax Liabilities, Beginning Balance | 44 | 51
Deferred Income Tax Liabilities, Ending Balance | 22 | 44
Deferred Income Tax Assets, Beginning Balance | (285) | (326)
Deferred Income Tax Assets, Ending Balance | (276) | (285)
Other [Member] | Deferred Income Tax Liabilities [Member] |  |
Reconciliation Of Changes In Deferred Tax Liability Asset [Line Items] |  |
Charged (Credited) to Earnings | (22) | (7)
Other [Member] | Deferred Income Tax Assets [Member] |  |
Reconciliation Of Changes In Deferred Tax Liability Asset [Line Items] |  |
Charged (Credited) to Earnings | 12 | 34
Charged (Credited) to OCI | $ (3) | $ 7

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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 2020-01-01 -Paragraph 81 -Subparagraph g -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2020-en-r&anchor=para_81_g_i&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 54 -Subparagraph o -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_54_o&doctype=Standard -URIDate 2020-01-01 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 56 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_56&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of tax expense or income relating to changes in deferred tax liabilities and deferred tax assets, recognised in profit or loss. [Refer: Deferred tax assets; Deferred tax expense (income); Deferred tax liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2020-01-01 -Paragraph 81 -Subparagraph g -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2020-en-r&anchor=para_81_g_ii&doctype=Standard -URIDate 2020-01-01 + Details
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