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Post-employee benefit plans - Funded Status of Post-Employment Benefit Plans Cost (Details) - CAD ($)
$ in Millions
Jun. 30, 2022
Dec. 31, 2021
Disclosure of defined benefit plans [line items]    
Effect of asset limit $ (1,217) $ (652)
Post-employment benefit asset (liability) 2,981 1,738
FUNDED    
Disclosure of defined benefit plans [line items]    
Effect of asset limit (1,217) (652)
Post-employment benefit asset (liability) 4,227 3,455
PARTIALLY FUNDED    
Disclosure of defined benefit plans [line items]    
Effect of asset limit 0 0
Post-employment benefit asset (liability) (1,023) (1,428)
UNFUNDED    
Disclosure of defined benefit plans [line items]    
Effect of asset limit 0 0
Post-employment benefit asset (liability) (223) (289)
Plan surplus (deficit)    
Disclosure of defined benefit plans [line items]    
Present value of post- employment benefit obligations (19,669) (26,001)
Fair value of plan assets 23,867 28,391
Plan surplus (deficit) 4,198 2,390
Plan surplus (deficit) | FUNDED    
Disclosure of defined benefit plans [line items]    
Present value of post- employment benefit obligations (18,016) (23,872)
Fair value of plan assets 23,460 27,979
Plan surplus (deficit) 5,444 4,107
Plan surplus (deficit) | PARTIALLY FUNDED    
Disclosure of defined benefit plans [line items]    
Present value of post- employment benefit obligations (1,430) (1,840)
Fair value of plan assets 407 412
Plan surplus (deficit) (1,023) (1,428)
Plan surplus (deficit) | UNFUNDED    
Disclosure of defined benefit plans [line items]    
Present value of post- employment benefit obligations (223) (289)
Fair value of plan assets 0 0
Plan surplus (deficit) $ (223) $ (289)