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Accounts Receivables and Accrued Revenues - Schedule of accounts receivables and accrued revenues (Detail) - CAD ($)
$ in Millions
 12 Months Ended 48 Months Ended
Dec. 31, 2021
Dec. 31, 2021
Dec. 31, 2020
Trade and other current receivables [abstract]      
Trade and Accruals $ 2,548 $ 2,548 $ 1,149
Prepaids and Deposits 486 486 121
Partner Advances 371 371 175
Joint Operations Receivables 225 225 35
Other 240 240 8
Accounts Receivable and Accrued Revenues 3,870 3,870 $ 1,488
Insurance proceeds $ 120 $ 135