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Pensions and Other Benefits - Pension Plan Asset (Details) - Pension Plan, Defined Benefit - CAD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Pension plans in deficit [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Projected benefit obligation at December 31 $ (534) $ (488)
Fair value of fund assets at December 31 240 222
Pension plans in deficit, Funded Status (294) (266)
Pension plans in surplus [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Projected benefit obligation at December 31 (12,076) (10,884)
Fair value of fund assets at December 31 13,079 12,127
Pension plans in surplus, Funded Status $ 1,003 $ 1,243