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Receivables And Other Current Assets (Details) - CAD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Deferred Costs Capitalized Prepaid Expense and Other Assets, Current [Abstract]    
Customer accounts receivable - billed $ 844 $ 805
Customer accounts receivable - unbilled 296 278
Allowance for Doubtful Accounts Receivable, Current 179 89
Other receivables 86 70
Capitalized transportation capacity 42 59
Prepaid expenses 175 24
Due From Related Parties 9 8
Net investment in direct financing lease 0 5
Income Taxes Receivable, Current 0 0
Other (11) (12)
Receivables and other current assets $ 1,620 $ 1,326