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Employee Future Benefits - Schedule of Funded Status (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Change in value of plan assets    
Balance, beginning of year $ 3,468  
Balance, end of year 3,743 $ 3,468
Other assets (Note 9) 355 274
Other liabilities (Note 16) (527) (423)
Defined Benefit Pension Plans    
Change in benefit obligation    
Balance, beginning of year 3,063 3,922
Service costs 62 106
Employee contributions 17 18
Interest costs 159 114
Benefits paid (169) (195)
Actuarial losses (gains) 255 (1,026)
Foreign currency translation (40) 124
Balance, end of year 3,347 3,063
Change in value of plan assets    
Balance, beginning of year 3,079 3,722
Actual return on plan assets 373 (651)
Benefits paid (162) (187)
Employee contributions 17 18
Employer contributions 46 54
Foreign currency translation (40) 123
Balance, end of year 3,313 3,079
Funded status (34) 16
Other assets (Note 9) 236 188
Other current liabilities (Note 13) (15) (15)
Other liabilities (Note 16) (255) (157)
Net liabilities (34) 16
Accumulated benefit obligation 2,983 2,818
OPEB Plans    
Change in benefit obligation    
Balance, beginning of year 582 747
Service costs 22 35
Employee contributions 3 3
Interest costs 30 21
Benefits paid (31) (29)
Actuarial losses (gains) (1) (225)
Foreign currency translation (9) 30
Balance, end of year 596 582
Change in value of plan assets    
Balance, beginning of year 389 440
Actual return on plan assets 61 (77)
Benefits paid (26) (24)
Employee contributions 3 3
Employer contributions 13 19
Foreign currency translation (10) 28
Balance, end of year 430 389
Funded status (166) (193)
Other assets (Note 9) 119 86
Other current liabilities (Note 13) (13) (13)
Other liabilities (Note 16) (272) (266)
Net liabilities $ (166) $ (193)