XML 250 R135.htm IDEA: XBRL DOCUMENT v3.22.4
Post-employment benefit plans - Disclosure of Contributions to Post-Employment Benefit Plans (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Disclosure of defined benefit plans [line items]    
Contributions, defined contribution plan $ (59) $ (114)
Estimated of contributions expected to be paid to plan for next annual reporting period, defined contribution plan 10  
DB pension    
Disclosure of defined benefit plans [line items]    
Estimate of contributions expected to be paid to plan for next annual reporting period, defined benefit plan 50  
OPEBs    
Disclosure of defined benefit plans [line items]    
Estimate of contributions expected to be paid to plan for next annual reporting period, defined benefit plan 75  
Plan assets    
Disclosure of defined benefit plans [line items]    
Contributions, defined benefit plan (145) (233)
Plan assets | DB pension    
Disclosure of defined benefit plans [line items]    
Contributions, defined benefit plan (81) (168)
Plan assets | OPEBs    
Disclosure of defined benefit plans [line items]    
Contributions, defined benefit plan $ (64) $ (65)