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ACQUISITIONS AND DISPOSITIONS - Schedule of Net Assets Held for Sale (Details) - Disposal group, held-for-sale, not discontinued operations - CAD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Accounts receivable and other (current assets held for sale) | $ 28 | $ 117
Deferred amounts and other assets (long-term assets held for sale) | 269 | 2,383
Accounts payable and other (current liabilities held for sale) | 0 | (63)
Other long-term liabilities (long-term liabilities held for sale) | 0 | (96)
Net assets held for sale | 297 | 2,341
Disposal group, property, plant and equipment, noncurrent | $ 181 | $ 2,100

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