XML 195 R119.htm IDEA: XBRL DOCUMENT v3.22.0.1
Pensions and other benefits - Funded Status of Pension Plans (Details) - Pensions - CAD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Pension plans in surplus    
Defined Benefit Plan Disclosure [Line Items]    
Projected benefit obligation at December 31 $ (12,346) $ (13,220)
Fair value of fund assets at December 31 14,663 14,114
Funded Status 2,317 894
Pension plans in deficit    
Defined Benefit Plan Disclosure [Line Items]    
Projected benefit obligation at December 31 (538) (579)
Fair value of fund assets at December 31 275 251
Funded Status $ (263) $ (328)