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Employee Benefit Plans (Plans with PBO/APBO in excess of Plan assets) (Details) - CAD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Defined benefit pension plans    
Plans with PBO/APBO in Excess of Plan Assets    
PBO/APBO $ 1,006 $ 140
Fair value of plan assets 914 35
Funded Status (92) (105)
Non-pension Benefit Plans    
Plans with PBO/APBO in Excess of Plan Assets    
PBO/APBO 221 290
Fair value of plan assets 0 0
Funded Status $ (221) $ (290)