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PROVISIONS | 12 Months Ended
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Dec. 31, 2017
Other Provisions, Contingent Liabilities and Contingent Assets [Abstract] |
PROVISIONS | PROVISIONS ACCOUNTING POLICY Decommissioning and restoration costs We use network and other assets on leased premises in some of our business activities. We expect to exit these premises in the future and we therefore make provisions for the costs associated with decommissioning the assets and restoring the locations to their original conditions when we have a legal or constructive obligation to do so. We calculate these costs based on a current estimate of the costs that will be incurred, project those costs into the future based on management's best estimates of future trends in prices, inflation, and other factors, and discount them to their present value. We revise our forecasts when business conditions or technological requirements change. When we recognize a decommissioning liability, we recognize a corresponding asset in property, plant and equipment and depreciate the asset based on the corresponding asset’s useful life following our depreciation policies for property, plant and equipment. We recognize the accretion of the liability as a charge to finance costs on the Consolidated Statements of Income. Restructuring We make provisions for restructuring when we have approved a detailed and formal restructuring plan and either the restructuring has started or management has announced the plan's main features to the employees affected by it. Restructuring obligations that have uncertain timing or amounts are recognized as provisions; otherwise they are recognized as accrued liabilities. All charges are recognized in restructuring, acquisition and other on the Consolidated Statements of Income (see note 9). Onerous contracts We make provisions for onerous contracts when the unavoidable costs of meeting our obligation under a contract exceed the benefits we expect to realize from it. We measure these provisions at the present value of the lower of the expected cost of terminating the contract or the expected cost of continuing with the contract. We recognize any impairment loss on the assets associated with the contract before we make the provision. USE OF ESTIMATES AND JUDGMENTS ESTIMATES We recognize a provision when a past event creates a legal or constructive obligation that can be reasonably estimated and is likely to result in an outflow of economic resources. We recognize a provision even when the timing or amount of the obligation may be uncertain, which can require us to use significant estimates. JUDGMENTS Significant judgment is required to determine when we are subject to unavoidable costs arising from onerous contracts. These judgments may include, for example, whether a certain promise is legally binding or whether we may be successful in negotiations with the counterparty. EXPLANATORY INFORMATION
(In millions of dollars) | Decommissioning Liabilities |  | shomi |  | Other |  | Total |
December 31, 2016 | 35 |  | 112 |  | 20 |  | 167 |
Additions | — |  | — |  | 1 |  | 1 |
Adjustments to existing provisions | 4 |  | — |  | — |  | 4 |
Reversals | — |  | (20 | ) | — |  | (20 | )
Amounts used | (4 | ) | (92 | ) | (17 | ) | (113 | )
December 31, 2017 | 35 |  | — |  | 4 |  | 39 |
Current | 2 |  | — |  | 2 |  | 4 |
Long-term | 33 |  | — |  | 2 |  | 35 |
Decommissioning and restoration costs Cash outflows associated with our decommissioning liabilities are generally expected to occur at the decommissioning dates of the assets to which they relate, which are long-term in nature. The timing and extent of restoration work that will ultimately be required for these sites is uncertain. shomi In 2016, we announced the decision to wind down our shomi joint venture. shomi was equally owned by Rogers and Shaw. We were therefore responsible for our portion of any remaining contractual liabilities (most significantly video content costs) incurred by the venture. In 2016, we recognized a provision related to our share of the remaining obligations based on our best estimate of the expected future costs. In 2017, we recognized a $20 million provision reversal related to the wind-down of shomi (see note 11). Other Other provisions include various legal claims, which are expected to be settled within five years.

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