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Post-employment benefit plans - Components of Post-Employment Benefit (Obligations) Assets (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Disclosure of net defined benefit liability (asset) [line items]    
Post-employment benefit obligations, January 1 $ 1,738  
Interest on obligations 51 $ (20)
Actuarial gains (losses) 894 3,020
Transfers to DC plans (57) 0
Post-employment benefit obligations, December 31 2,248 1,738
Post-employment benefit assets 3,559 3,472
Post-employment benefit obligations (1,311) (1,734)
Experience gains (losses) included in actuarial gains (4,729) 907
Actual return on plan assets $ (3,370) $ 1,486
Actual return on plan assets, percent (11.60%) 5.70%
Benefit obligations    
Disclosure of net defined benefit liability (asset) [line items]    
Post-employment benefit obligations, January 1 $ (26,001) $ (28,749)
Current service cost (195) (225)
Interest on obligations (814) (736)
Actuarial gains (losses) 5,150 2,250
Benefit payments 1,436 1,467
Employee contributions (9) (9)
Other 0 1
Post-employment benefit obligations, December 31 (20,433) (26,001)
Plan assets    
Disclosure of net defined benefit liability (asset) [line items]    
Post-employment benefit obligations, January 1 28,391 28,129
Interest on obligations 886 716
Actuarial gains (losses) (4,256) 770
Benefit payments (1,436) (1,467)
Employer contributions 145 233
Employee contributions 9 9
Other 0 1
Post-employment benefit obligations, December 31 23,682 28,391
Plan asset (deficit)    
Disclosure of net defined benefit liability (asset) [line items]    
Post-employment benefit obligations, January 1 2,390  
Post-employment benefit obligations, December 31 3,249 2,390
Effect of asset limit    
Disclosure of net defined benefit liability (asset) [line items]    
Post-employment benefit obligations, January 1 (652)  
Post-employment benefit obligations, December 31 (980) (652)
DB PENSION PLANS    
Disclosure of net defined benefit liability (asset) [line items]    
Post-employment benefit obligations, January 1 2,844  
Current service cost (193) (223)
Interest on obligations 84 11
Post-employment benefit obligations, December 31 3,059 2,844
Post-employment benefit assets 3,559 3,472
Post-employment benefit obligations (500) (628)
DB PENSION PLANS | Benefit obligations    
Disclosure of net defined benefit liability (asset) [line items]    
Post-employment benefit obligations, January 1 (24,544) (27,149)
Current service cost (193) (223)
Interest on obligations (770) (697)
Actuarial gains (losses) 4,856 2,137
Benefit payments 1,366 1,396
Employee contributions (9) (9)
Other (1) 1
Post-employment benefit obligations, December 31 (19,295) (24,544)
DB PENSION PLANS | Plan assets    
Disclosure of net defined benefit liability (asset) [line items]    
Post-employment benefit obligations, January 1 28,040 27,785
Interest on obligations 875 708
Actuarial gains (losses) (4,227) 766
Benefit payments (1,366) (1,396)
Employer contributions 81 168
Employee contributions 9 9
Transfers to DC plans (57) 0
Other 0 0
Post-employment benefit obligations, December 31 23,355 28,040
DB PENSION PLANS | Plan asset (deficit)    
Disclosure of net defined benefit liability (asset) [line items]    
Post-employment benefit obligations, January 1 3,496  
Post-employment benefit obligations, December 31 4,060 3,496
DB PENSION PLANS | Effect of asset limit    
Disclosure of net defined benefit liability (asset) [line items]    
Post-employment benefit obligations, January 1 (652)  
Interest on obligations (21) 0
Post-employment benefit obligations, December 31 (980) (652)
OPEB PLANS    
Disclosure of net defined benefit liability (asset) [line items]    
Post-employment benefit obligations, January 1 (1,106)  
Current service cost (2) (2)
Interest on obligations (33) (31)
Post-employment benefit obligations, December 31 (811) (1,106)
Post-employment benefit assets 0 0
Post-employment benefit obligations (811) (1,106)
OPEB PLANS | Benefit obligations    
Disclosure of net defined benefit liability (asset) [line items]    
Post-employment benefit obligations, January 1 (1,457) (1,600)
Current service cost (2) (2)
Interest on obligations (44) (39)
Actuarial gains (losses) 294 113
Benefit payments 70 71
Employee contributions 0 0
Other 1 0
Post-employment benefit obligations, December 31 (1,138) (1,457)
OPEB PLANS | Plan assets    
Disclosure of net defined benefit liability (asset) [line items]    
Post-employment benefit obligations, January 1 351 344
Interest on obligations 11 8
Actuarial gains (losses) (29) 4
Benefit payments (70) (71)
Employer contributions 64 65
Employee contributions 0 0
Transfers to DC plans 0 0
Other 0 1
Post-employment benefit obligations, December 31 327 351
OPEB PLANS | Plan asset (deficit)    
Disclosure of net defined benefit liability (asset) [line items]    
Post-employment benefit obligations, January 1 (1,106)  
Post-employment benefit obligations, December 31 (811) (1,106)
OPEB PLANS | Effect of asset limit    
Disclosure of net defined benefit liability (asset) [line items]    
Post-employment benefit obligations, January 1 0  
Interest on obligations 0 0
Post-employment benefit obligations, December 31 $ 0 $ 0