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Post-employment benefit plans - Components of Post-Employment Benefit (Obligations) Assets (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of net defined benefit liability (asset) [line items]    
Post-employment benefit obligations, January 1 $ (685)  
Interest on obligations (20) $ (46)
Actuarial gains (losses) 3,020 732
Post-employment benefit obligations, December 31 1,738 (685)
Post-employment benefit assets 3,472 1,277
Post-employment benefit obligations (1,734) (1,962)
Experience gains (losses) included in actuarial gains 907 2,613
Actual return on plan assets $ 1,486 $ 3,434
Actual return on plan assets, percent 5.70% 13.70%
Benefit obligations    
Disclosure of net defined benefit liability (asset) [line items]    
Post-employment benefit obligations, January 1 $ (28,749) $ (27,179)
Current service cost (225) (221)
Interest on obligations (736) (828)
Actuarial gains (losses) 2,250 (1,920)
Benefit payments 1,467 1,409
Employee contributions (9) (10)
Other 1 0
Post-employment benefit obligations, December 31 (26,001) (28,749)
Plan assets    
Disclosure of net defined benefit liability (asset) [line items]    
Post-employment benefit obligations, January 1 28,129 25,850
Interest on obligations 716 782
Actuarial gains (losses) 770 2,652
Benefit payments (1,467) (1,409)
Employer contributions 233 244
Employee contributions 9 10
Other 1 0
Post-employment benefit obligations, December 31 28,391 28,129
Plan asset (deficit)    
Disclosure of net defined benefit liability (asset) [line items]    
Post-employment benefit obligations, January 1 (620)  
Post-employment benefit obligations, December 31 2,390 (620)
Effect of asset limit    
Disclosure of net defined benefit liability (asset) [line items]    
Post-employment benefit obligations, January 1 (65)  
Post-employment benefit obligations, December 31 (652) (65)
DB PENSION PLANS    
Disclosure of net defined benefit liability (asset) [line items]    
Post-employment benefit obligations, January 1 571  
Current service cost (223) (219)
Interest on obligations 11 (10)
Post-employment benefit obligations, December 31 2,844 571
Post-employment benefit assets 3,472 1,277
Post-employment benefit obligations (628) (706)
DB PENSION PLANS | Benefit obligations    
Disclosure of net defined benefit liability (asset) [line items]    
Post-employment benefit obligations, January 1 (27,149) (25,650)
Current service cost (223) (219)
Interest on obligations (697) (782)
Actuarial gains (losses) 2,137 (1,830)
Benefit payments 1,396 1,342
Employee contributions (9) (10)
Other 1 0
Post-employment benefit obligations, December 31 (24,544) (27,149)
DB PENSION PLANS | Plan assets    
Disclosure of net defined benefit liability (asset) [line items]    
Post-employment benefit obligations, January 1 27,785 25,530
Interest on obligations 708 772
Actuarial gains (losses) 766 2,632
Benefit payments (1,396) (1,342)
Employer contributions 168 183
Employee contributions 9 10
Other 0 0
Post-employment benefit obligations, December 31 28,040 27,785
DB PENSION PLANS | Plan asset (deficit)    
Disclosure of net defined benefit liability (asset) [line items]    
Post-employment benefit obligations, January 1 636  
Post-employment benefit obligations, December 31 3,496 636
DB PENSION PLANS | Effect of asset limit    
Disclosure of net defined benefit liability (asset) [line items]    
Post-employment benefit obligations, January 1 (65)  
Post-employment benefit obligations, December 31 (652) (65)
OPEB PLANS    
Disclosure of net defined benefit liability (asset) [line items]    
Post-employment benefit obligations, January 1 (1,256)  
Current service cost (2) (2)
Interest on obligations (31) (36)
Post-employment benefit obligations, December 31 (1,106) (1,256)
Post-employment benefit assets 0 0
Post-employment benefit obligations (1,106) (1,256)
OPEB PLANS | Benefit obligations    
Disclosure of net defined benefit liability (asset) [line items]    
Post-employment benefit obligations, January 1 (1,600) (1,529)
Current service cost (2) (2)
Interest on obligations (39) (46)
Actuarial gains (losses) 113 (90)
Benefit payments 71 67
Employee contributions 0 0
Other 0 0
Post-employment benefit obligations, December 31 (1,457) (1,600)
OPEB PLANS | Plan assets    
Disclosure of net defined benefit liability (asset) [line items]    
Post-employment benefit obligations, January 1 344 320
Interest on obligations 8 10
Actuarial gains (losses) 4 20
Benefit payments (71) (67)
Employer contributions 65 61
Employee contributions 0 0
Other 1 0
Post-employment benefit obligations, December 31 351 344
OPEB PLANS | Plan asset (deficit)    
Disclosure of net defined benefit liability (asset) [line items]    
Post-employment benefit obligations, January 1 (1,256)  
Post-employment benefit obligations, December 31 (1,106) (1,256)
OPEB PLANS | Effect of asset limit    
Disclosure of net defined benefit liability (asset) [line items]    
Post-employment benefit obligations, January 1 0  
Post-employment benefit obligations, December 31 $ 0 $ 0