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Employee Future Benefits - Fair Value of Plan Assets by Major Category (Details) - CAD
CAD in Millions
Dec. 31, 2017
Dec. 31, 2016
Disclosure of fair value of plan assets [line items]    
Money market and cash and cash equivalents CAD 13 CAD 17
Total 428 433
Canadian    
Disclosure of fair value of plan assets [line items]    
Equity securities 76 76
US    
Disclosure of fair value of plan assets [line items]    
Equity securities 31 30
International    
Disclosure of fair value of plan assets [line items]    
Equity securities 118 120
Private [Member]    
Disclosure of fair value of plan assets [line items]    
Equity securities 1 2
AAA    
Disclosure of fair value of plan assets [line items]    
Bonds 43 47
AA    
Disclosure of fair value of plan assets [line items]    
Bonds 71 58
A    
Disclosure of fair value of plan assets [line items]    
Bonds 44 55
BBB    
Disclosure of fair value of plan assets [line items]    
Bonds 26 23
Below BBB    
Disclosure of fair value of plan assets [line items]    
Bonds 5 5
Level I    
Disclosure of fair value of plan assets [line items]    
Money market and cash and cash equivalents (1) 3
Total 0 4
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 427 427
Level II | Canadian    
Disclosure of fair value of plan assets [line items]    
Equity securities 76 76
Level II | US    
Disclosure of fair value of plan assets [line items]    
Equity securities 31 30
Level II | International    
Disclosure of fair value of plan assets [line items]    
Equity securities 118 120
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 43 47
Level II | AA    
Disclosure of fair value of plan assets [line items]    
Bonds 71 58
Level II | A    
Disclosure of fair value of plan assets [line items]    
Bonds 44 55
Level II | BBB    
Disclosure of fair value of plan assets [line items]    
Bonds 25 22
Level II | Below BBB    
Disclosure of fair value of plan assets [line items]    
Bonds 5 5
Level III    
Disclosure of fair value of plan assets [line items]    
Money market and cash and cash equivalents 0 0
Total 1 2
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 2
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 CAD 0 CAD 0