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Employee Future Benefits - Fair Value of Plan Assets by Major Category (Details) - CAD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disclosure of fair value of plan assets [line items]    
Money market and cash and cash equivalents $ 19 $ 19
Total 381 386
Canadian    
Disclosure of fair value of plan assets [line items]    
Equity securities 64 66
US    
Disclosure of fair value of plan assets [line items]    
Equity securities 30 28
International    
Disclosure of fair value of plan assets [line items]    
Equity securities 103 102
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 36 40
AA    
Disclosure of fair value of plan assets [line items]    
Bonds 67 68
A    
Disclosure of fair value of plan assets [line items]    
Bonds 34 37
BBB    
Disclosure of fair value of plan assets [line items]    
Bonds 23 22
Below BBB    
Disclosure of fair value of plan assets [line items]    
Bonds 4 3
Level I    
Disclosure of fair value of plan assets [line items]    
Money market and cash and cash equivalents 0 0
Total 1 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 0 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 19 19
Total 379 384
Level II | Canadian    
Disclosure of fair value of plan assets [line items]    
Equity securities 64 66
Level II | US    
Disclosure of fair value of plan assets [line items]    
Equity securities 30 28
Level II | International    
Disclosure of fair value of plan assets [line items]    
Equity securities 103 102
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 36 40
Level II | AA    
Disclosure of fair value of plan assets [line items]    
Bonds 67 68
Level II | A    
Disclosure of fair value of plan assets [line items]    
Bonds 34 37
Level II | BBB    
Disclosure of fair value of plan assets [line items]    
Bonds 22 21
Level II | Below BBB    
Disclosure of fair value of plan assets [line items]    
Bonds 4 3
Level III    
Disclosure of fair value of plan assets [line items]    
Money market and cash and cash equivalents 0 0
Total 1 1
Level III | Canadian    
Disclosure of fair value of plan assets [line items]    
Equity securities 0 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