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Receivables and Other Current Assets
 12 Months Ended
Dec. 31, 2018
Deferred Costs Capitalized Prepaid Expense and Other Assets, Current [Abstract]  
Prepayment and other current assets [Text Block]
16. RECEIVABLES AND OTHER CURRENT ASSETS
Receivables and other current assets consisted of the following:
As atDecember 31December 31
millions of Canadian dollars 20182017
Customer accounts receivable – billed$ 844$ 805
Customer accounts receivable – unbilled 296 278
Allowance for doubtful accounts (11) (12)
Other receivables 86 70
Capitalized transportation capacity (1) 179 89
Income tax receivable 175 24
Prepaid expenses 42 59
Net investment in direct financing lease (note 20) 9 8
Due from related parties (note 15) - 5
$ 1,620$ 1,326
(1) Capitalized transportation capacity represents the value of transportation/storage received by EES on asset management agreements at the inception of the contracts. The asset is amortized over the term of each contract.