XML 187 R114.htm IDEA: XBRL DOCUMENT v3.20.4
Pensions and Other Benefits - Funded Status of Pension Plans (Details) - Pension Plan, Defined Benefit - CAD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Pension plans in deficit    
Defined Benefit Plan Disclosure [Line Items]    
Projected benefit obligation at December 31 $ (579) $ (534)
Fair value of fund assets at December 31 251 240
Funded Status (328) (294)
Pension plans in surplus    
Defined Benefit Plan Disclosure [Line Items]    
Projected benefit obligation at December 31 (13,220) (12,076)
Fair value of fund assets at December 31 14,114 13,079
Funded Status $ 894 $ 1,003