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Related Party Disclosures (Details) - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
RELATED PARTY DISCLOSURES    
Sales $ 723 $ 590
Purchases 237 223
Accounts receivable 33 44
Accounts payable and accrued liabilities 15 28
Compensation of Key Management Personnel    
Salaries and other short-term benefits 15 12
Pension and other post-retirement benefits 5 5
Share-based compensation 32 49
Total 52 66
Parachem Chemicals Inc    
RELATED PARTY DISCLOSURES    
Sales $ 338 $ 301