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Pensions and other benefits - Funded Status of Pension Plans (Details) - Pensions - CAD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Pension plans in surplus    
Defined Benefit Plan Disclosure [Line Items]    
Projected benefit obligation at December 31 $ (9,512) $ (12,346)
Fair value of fund assets at December 31 12,613 14,663
Funded Status 3,101 2,317
Pension plans in deficit    
Defined Benefit Plan Disclosure [Line Items]    
Projected benefit obligation at December 31 (424) (538)
Fair value of fund assets at December 31 249 275
Funded Status $ (175) $ (263)