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Trade and Other Receivables (Details) - CAD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Subclassifications of assets, liabilities and equities [abstract]    
Trade accounts receivable $ 399 $ 597
Promissory note receivable 0 25
Collateral paid (Note 15) 42 105
Current portion of finance lease receivables (Note 8) 15 24
Income taxes receivables 6 5
Trade and other receivables $ 462 $ 756