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Accounts Receivable and Other Current Assets - Schedule of Accounts Receivable and Other Current Assets (Details) - CAD CAD in Millions | Dec. 31, 2016 | Dec. 31, 2015
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Receivables [Abstract] |  |
Trade accounts receivable | CAD 507 | CAD 517
Unbilled accounts receivable | 551 | 404
Allowance for doubtful accounts | (33) | (66)
Income tax receivable | 26 | 0
Assets held for sale | 0 | 38
Other | 76 | 71
Accounts receivable and other current assets | CAD 1,127 | CAD 964

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- Definition Amounts due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer) for goods or services (including trade receivables) that have been delivered or sold in the normal course of business. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(5)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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