XML 147 R131.htm IDEA: XBRL DOCUMENT v3.22.0.1
POST-EMPLOYMENT BENEFITS - Present Value of Accrued Plan Benefits and Estimated Market Values of Net Assets (Details) - CAD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Disclosure of defined benefit plans [line items]    
Net deferred pension asset (liability) $ (96) $ (92)
Domestic defined benefit plans    
Disclosure of defined benefit plans [line items]    
Plan assets, at fair value 3,198 2,791
Accrued benefit obligations (3,171) (3,365)
Surplus (deficiency) of plan assets over accrued benefit obligations 27 (574)
Effect of asset ceiling limit (9) 0
Net deferred pension asset (liability) 18 (574)
Deferred pension asset 21 16
Deferred pension liability $ (3) $ (590)