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Litigation and other contingencies | 12 Months Ended
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Dec. 31, 2014
Litigation and other contingencies | 9. Litigation and other contingencies A variety of claims have been made against Imperial and its subsidiaries in a number of lawsuits. Management has regular litigation reviews, including updates from corporate and outside counsel, to assess the need for accounting recognition or disclosure of these contingencies. The company accrues an undiscounted liability for those contingencies where the incurrence of a loss is probable and the amount can be reasonably estimated. If a range of amounts can be reasonably estimated and no amount within the range is a better estimate than any other amount, then the minimum of the range is accrued. The company does not record liabilities when the likelihood that the liability has been incurred is probable but the amount cannot be reasonably estimated or when the liability is believed to be only reasonably possible or remote. For contingencies where an unfavourable outcome is reasonably possible and which are significant, the company discloses the nature of the contingency and, where feasible, an estimate of the possible loss. For purposes of the company’s contingency disclosures, “significant” includes material matters as well as other matters which management believes should be disclosed. Based on a consideration of all relevant facts and circumstances, the company does not believe the ultimate outcome of any currently pending lawsuits against the company will have a material adverse effect on the company’s operations, financial condition, or financial statements taken as a whole. Additionally, the company has other commitments arising in the normal course of business for operating and capital needs, all of which are expected to be fulfilled with no adverse consequences material to the company’s operations or financial condition. Unconditional purchase obligations, as defined by accounting standards, are those long-term commitments that are non-cancelable or cancelable only under certain conditions and that third parties have used to secure financing for the facilities that will provide the contracted goods and services.
|  | Payments due by period |
millions of dollars |  | 2015 |  |  | 2016 |  |  | 2017 |  |  | 2018 |  |  | 2019 |  |  | After 2019 |  |  | Total |
Unconditional purchase obligations (a) |  |  | 100 |  |  |  | 84 |  |  |  | 85 |  |  |  | 88 |  |  |  | 99 |  |  |  | 225 |  |  |  | 681 |
| (a) | Undiscounted obligations of $681 million mainly pertain to pipeline throughput agreements. Total payments under unconditional purchase obligations were $112 million (2013 - $95 million, 2012 - $86 million). The present value of these commitments, excluding imputed interest of $125 million, totalled $556 million.

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