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CHANGES IN ACCOUNTING POLICIES - Schedule of Impact from Adoption of ASC 606 (Details) - CAD ($) $ in Millions | Dec. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | --- | --- | ---
Assets |  |  |  |  |
Deferred amounts and other assets | $ 8,558 | $ 6,272 | $ 6,442 |  |
Property, plant and equipment, net | 94,540 | 90,823 | 90,711 |  |
Liabilities and equity |  |  |  |  |
Accounts payable and other | 9,836 | 9,540 | 9,478 |  |
Other long-term liabilities | 8,834 | 7,576 | 7,510 |  |
Deferred income taxes | 9,454 | 9,233 | 9,295 |  |
Redeemable noncontrolling interests | 0 | 4,029 | 4,067 | $ 3,392 | $ 2,141
Deficit | $ (5,538) | (2,554) | (2,468) |  |
Calculated under Revenue Guidance in Effect before Topic 606 |  |  |  |  |
Assets |  |  |  |  |
Deferred amounts and other assets |  |  | 6,442 |  |
Property, plant and equipment, net |  |  | 90,711 |  |
Liabilities and equity |  |  |  |  |
Accounts payable and other |  |  | 9,478 |  |
Other long-term liabilities |  |  | 7,510 |  |
Deferred income taxes |  |  | 9,295 |  |
Redeemable noncontrolling interests |  |  | 4,067 |  |
Deficit |  |  | $ (2,468) |  |
Accounting Standards Update 2014-09 | Difference between revenue guidance in effect before and after Topic 606 |  |  |  |  |
Assets |  |  |  |  |
Deferred amounts and other assets |  | (170) |  |  |
Property, plant and equipment, net |  | 112 |  |  |
Liabilities and equity |  |  |  |  |
Accounts payable and other |  | 62 |  |  |
Other long-term liabilities |  | 66 |  |  |
Deferred income taxes |  | (62) |  |  |
Redeemable noncontrolling interests |  | (38) |  |  |
Deficit |  | $ (86) |  |  |

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