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Employee Future Benefits - Fair Value of Plan Assets by Major Category (Details) - CAD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Disclosure of fair value of plan assets [line items]    
Alternative funds $ 39  
Money market and cash and cash equivalents 20 $ 20
Total 289 353
Canadian    
Disclosure of fair value of plan assets [line items]    
Equity securities 18 33
US    
Disclosure of fair value of plan assets [line items]    
Equity securities 17 20
International    
Disclosure of fair value of plan assets [line items]    
Equity securities 79 126
Private    
Disclosure of fair value of plan assets [line items]    
Equity securities 1 1
AAA    
Disclosure of fair value of plan assets [line items]    
Bonds 24 28
AA    
Disclosure of fair value of plan assets [line items]    
Bonds 38 54
A    
Disclosure of fair value of plan assets [line items]    
Bonds 26 36
Loans 1  
BBB    
Disclosure of fair value of plan assets [line items]    
Bonds 19 25
Loans 1  
Below BBB    
Disclosure of fair value of plan assets [line items]    
Bonds 6 10
Level I    
Disclosure of fair value of plan assets [line items]    
Alternative funds 0  
Money market and cash and cash equivalents 0 0
Total 51 48
Level I | Canadian    
Disclosure of fair value of plan assets [line items]    
Equity securities 0 0
Level I | US    
Disclosure of fair value of plan assets [line items]    
Equity securities 12 0
Level I | International    
Disclosure of fair value of plan assets [line items]    
Equity securities 38 47
Level I | Private    
Disclosure of fair value of plan assets [line items]    
Equity securities 0 0
Level I | AAA    
Disclosure of fair value of plan assets [line items]    
Bonds 0 0
Level I | AA    
Disclosure of fair value of plan assets [line items]    
Bonds 0 0
Level I | A    
Disclosure of fair value of plan assets [line items]    
Bonds 0 0
Loans 0  
Level I | BBB    
Disclosure of fair value of plan assets [line items]    
Bonds 1 1
Loans 0  
Level I | Below BBB    
Disclosure of fair value of plan assets [line items]    
Bonds 0 0
Level II    
Disclosure of fair value of plan assets [line items]    
Alternative funds 0  
Money market and cash and cash equivalents 20 20
Total 198 300
Level II | Canadian    
Disclosure of fair value of plan assets [line items]    
Equity securities 18 29
Level II | US    
Disclosure of fair value of plan assets [line items]    
Equity securities 5 20
Level II | International    
Disclosure of fair value of plan assets [line items]    
Equity securities 41 79
Level II | Private    
Disclosure of fair value of plan assets [line items]    
Equity securities 0 0
Level II | AAA    
Disclosure of fair value of plan assets [line items]    
Bonds 24 28
Level II | AA    
Disclosure of fair value of plan assets [line items]    
Bonds 38 54
Level II | A    
Disclosure of fair value of plan assets [line items]    
Bonds 26 36
Loans 1  
Level II | BBB    
Disclosure of fair value of plan assets [line items]    
Bonds 18 24
Loans 1  
Level II | Below BBB    
Disclosure of fair value of plan assets [line items]    
Bonds 6 10
Level III    
Disclosure of fair value of plan assets [line items]    
Alternative funds 39  
Money market and cash and cash equivalents 0 0
Total 40 5
Level III | Canadian    
Disclosure of fair value of plan assets [line items]    
Equity securities 0 4
Level III | US    
Disclosure of fair value of plan assets [line items]    
Equity securities 0 0
Level III | International    
Disclosure of fair value of plan assets [line items]    
Equity securities 0 0
Level III | Private    
Disclosure of fair value of plan assets [line items]    
Equity securities 1 1
Level III | AAA    
Disclosure of fair value of plan assets [line items]    
Bonds 0 0
Level III | AA    
Disclosure of fair value of plan assets [line items]    
Bonds 0 0
Level III | A    
Disclosure of fair value of plan assets [line items]    
Bonds 0 0
Loans 0  
Level III | BBB    
Disclosure of fair value of plan assets [line items]    
Bonds 0 0
Loans 0  
Level III | Below BBB    
Disclosure of fair value of plan assets [line items]    
Bonds $ 0 $ 0