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Employee Future Benefits - Fair Value of Plan Assets by Major Category (Details) - CAD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Disclosure of fair value of plan assets [line items]    
Money market and cash and cash equivalents $ 20 $ 19
Total 353 381
Canadian    
Disclosure of fair value of plan assets [line items]    
Equity securities 33 64
US    
Disclosure of fair value of plan assets [line items]    
Equity securities 20 30
International    
Disclosure of fair value of plan assets [line items]    
Equity securities 126 103
Private [Member]    
Disclosure of fair value of plan assets [line items]    
Equity securities 1 1
AAA    
Disclosure of fair value of plan assets [line items]    
Bonds 28 36
AA    
Disclosure of fair value of plan assets [line items]    
Bonds 54 67
A    
Disclosure of fair value of plan assets [line items]    
Bonds 36 34
BBB    
Disclosure of fair value of plan assets [line items]    
Bonds 25 23
Below BBB    
Disclosure of fair value of plan assets [line items]    
Bonds 10 4
Level I    
Disclosure of fair value of plan assets [line items]    
Money market and cash and cash equivalents 0 0
Total 48 1
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 0 0
Level I | International    
Disclosure of fair value of plan assets [line items]    
Equity securities 47 0
Level I | Private [Member]    
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
Level I | BBB    
Disclosure of fair value of plan assets [line items]    
Bonds 1 1
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]    
Money market and cash and cash equivalents 20 19
Total 300 379
Level II | Canadian    
Disclosure of fair value of plan assets [line items]    
Equity securities 29 64
Level II | US    
Disclosure of fair value of plan assets [line items]    
Equity securities 20 30
Level II | International    
Disclosure of fair value of plan assets [line items]    
Equity securities 79 103
Level II | Private [Member]    
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 28 36
Level II | AA    
Disclosure of fair value of plan assets [line items]    
Bonds 54 67
Level II | A    
Disclosure of fair value of plan assets [line items]    
Bonds 36 34
Level II | BBB    
Disclosure of fair value of plan assets [line items]    
Bonds 24 22
Level II | Below BBB    
Disclosure of fair value of plan assets [line items]    
Bonds 10 4
Level III    
Disclosure of fair value of plan assets [line items]    
Money market and cash and cash equivalents 0 0
Total 5 1
Level III | Canadian    
Disclosure of fair value of plan assets [line items]    
Equity securities 4 0
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 [Member]    
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
Level III | BBB    
Disclosure of fair value of plan assets [line items]    
Bonds 0 0
Level III | Below BBB    
Disclosure of fair value of plan assets [line items]    
Bonds $ 0 $ 0