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Financial and derivative instruments - Summary of estimated fair value of financial instruments (Detail) - CAD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Derivative Asset [Abstract]    
Derivative Asset $ 66 [1] $ 41 [2]
Derivative Liability [Abstract]    
Derivative liabilities [3] 78 43
Effect of counterparty netting [Member]    
Derivative Asset [Abstract]    
Derivative Asset (59) [1] (31) [2]
Derivative Liability [Abstract]    
Derivative liabilities [3] (59) (31)
Derivative fair value of derivative amount effect of collateral netting [Member]    
Derivative Asset [Abstract]    
Derivative Asset 0 [1] 0 [2]
Derivative Liability [Abstract]    
Derivative liabilities [3] (4) (7)
Net Carrying Value [Member]    
Derivative Asset [Abstract]    
Derivative Asset 7 [1] 10 [2]
Derivative Liability [Abstract]    
Derivative liabilities [3] 15 5
Fair Value, Inputs, Level 1 [Member]    
Derivative Asset [Abstract]    
Derivative Asset 48 [1] 24 [2]
Derivative Liability [Abstract]    
Derivative liabilities [3] 53 31
Fair Value, Inputs, Level 2 [Member]    
Derivative Asset [Abstract]    
Derivative Asset 18 [1] 17 [2]
Derivative Liability [Abstract]    
Derivative liabilities [3] 25 12
Fair Value, Inputs, Level 3 [Member]    
Derivative Asset [Abstract]    
Derivative Asset 0 [1] 0 [2]
Derivative Liability [Abstract]    
Derivative liabilities [3] $ 0 $ 0
[1] Included in the Consolidated balance sheet line: “Materials, supplies and prepaid expenses”, “Accounts receivable—net” and “Other assets, including intangibles - net”.
[2] Included in the Consolidated balance sheet line: “Materials, supplies and prepaid expenses”, “Accounts receivable - net” and “Other assets, including intangibles - net”.
[3] Included in the Consolidated balance sheet line: “Accounts payable and accrued liabilities” and “Other long-term obligations”.