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Employee Future Benefits - Fair Value of Plan Assets by Major Category (Details) - CAD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Disclosure of fair value of plan assets [line items]    
Money market and cash and cash equivalents $ 19 $ 12
Total 386 381
Canadian    
Disclosure of fair value of plan assets [line items]    
Equity securities 66 65
US    
Disclosure of fair value of plan assets [line items]    
Equity securities 28 26
International    
Disclosure of fair value of plan assets [line items]    
Equity securities 102 101
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 40 48
AA    
Disclosure of fair value of plan assets [line items]    
Bonds 68 64
A    
Disclosure of fair value of plan assets [line items]    
Bonds 37 39
BBB    
Disclosure of fair value of plan assets [line items]    
Bonds 22 22
Below BBB    
Disclosure of fair value of plan assets [line items]    
Bonds 3 3
Level I    
Disclosure of fair value of plan assets [line items]    
Money market and cash and cash equivalents 0 (2)
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 14
Total 384 381
Level II | Canadian    
Disclosure of fair value of plan assets [line items]    
Equity securities 66 65
Level II | US    
Disclosure of fair value of plan assets [line items]    
Equity securities 28 26
Level II | International    
Disclosure of fair value of plan assets [line items]    
Equity securities 102 101
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 40 48
Level II | AA    
Disclosure of fair value of plan assets [line items]    
Bonds 68 64
Level II | A    
Disclosure of fair value of plan assets [line items]    
Bonds 37 39
Level II | BBB    
Disclosure of fair value of plan assets [line items]    
Bonds 21 21
Level II | Below BBB    
Disclosure of fair value of plan assets [line items]    
Bonds 3 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