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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)