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POST-EMPLOYMENT BENEFITS - Remeasurement Recognized in OCI and Equity (Details) - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of net defined benefit liability (asset) [line items]    
Return on plan assets (excluding interest income) $ 297 $ 240
Change in asset ceiling (9) 0
Domestic defined benefit plans    
Disclosure of net defined benefit liability (asset) [line items]    
Return on plan assets (excluding interest income) 223 163
Change in financial assumptions 390 (272)
Effect of experience adjustments (18) (4)
Remeasurement gain (loss), recognized in other comprehensive income and equity $ 586 $ (113)