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Receivables And Other Current Assets (Details) - CAD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Deferred Costs Capitalized Prepaid Expense and Other Assets, Current [Abstract] |  |
Customer accounts receivable |  | $ 985
Other |  | 42
Capitalized transportation capacity | $ 89 | 190
Prepaid expenses | 59 | 57
Due From Related Parties | 5 | 16
Net investment in direct financing lease | 8 | 8
Income Taxes Receivable, Current | 24 | 33
Other | 0 | 5
Receivables and other current assets | $ 1,326 | $ 1,323

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