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DISPOSITIONS - ASEETS HELD FOR SALE (Details) - Disposal Group, Held-for-sale, Not Discontinued Operations - CAD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017
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Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Accounts receivable and other (current assets held for sale) | $ 363 | $ 424
Deferred amounts and other assets (long-term assets held for sale) | 1,186 | 1,190
Accounts payable and other (current liabilities held for sale) | (348) | (315)
Other long-term liabilities (long-term liabilities held for sale) | (43) | (34)
Net assets held for sale | $ 1,158 | $ 1,265

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