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Employee Future Benefits - Fair Value of Plan Assets by Major Category (Details) - CAD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure of fair value of plan assets [line items]    
Money market and cash and cash equivalents $ 12 $ 13
Total 381 428
Canadian    
Disclosure of fair value of plan assets [line items]    
Equity securities 65 76
US    
Disclosure of fair value of plan assets [line items]    
Equity securities 26 31
International    
Disclosure of fair value of plan assets [line items]    
Equity securities 101 118
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 48 43
AA    
Disclosure of fair value of plan assets [line items]    
Bonds 64 71
A    
Disclosure of fair value of plan assets [line items]    
Bonds 39 44
BBB    
Disclosure of fair value of plan assets [line items]    
Bonds 22 26
Below BBB    
Disclosure of fair value of plan assets [line items]    
Bonds 3 5
Level I    
Disclosure of fair value of plan assets [line items]    
Money market and cash and cash equivalents (2) (1)
Total (1) 0
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 14 14
Total 381 427
Level II | Canadian    
Disclosure of fair value of plan assets [line items]    
Equity securities 65 76
Level II | US    
Disclosure of fair value of plan assets [line items]    
Equity securities 26 31
Level II | International    
Disclosure of fair value of plan assets [line items]    
Equity securities 101 118
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 48 43
Level II | AA    
Disclosure of fair value of plan assets [line items]    
Bonds 64 71
Level II | A    
Disclosure of fair value of plan assets [line items]    
Bonds 39 44
Level II | BBB    
Disclosure of fair value of plan assets [line items]    
Bonds 21 25
Level II | Below BBB    
Disclosure of fair value of plan assets [line items]    
Bonds 3 5
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