| NOTE | Downstream Segment | Retail Segment |
Upstream Segment | Corporate Functions | Total | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 2019 | 2018 | 2019 | 2018 | 2019 | 2018 | 2019 | 2018 | 2019 | 2018 | ||
| Short-term | 70,612 | 70,961 | 38,701 | 37,228 | 608 | 605 | 55 | 40 | 109,976 | 108,834 | |
| Long-term | 869 | 607 | 2 | 4 | – | – | 4 | 39 | 875 | 650 | |
| 11.1 | 71,481 | 71,568 | 38,703 | 37,232 | 608 | 605 | 59 | 79 | 110,851 | 109,484 | |
The duration of most contracts within the Group is short-term. Revenues on services for which start and end dates fall in different reporting periods (long-term contracts) are recognised based on the stage of service completion, if the result on the transaction can be reliably estimated. Long-term contracts that remain unfulfilled in full as at the balance sheet date relate i.a. to construction and assembly contracts, energy sales.
As at 31 December 2019 the Group analysed the value of the transaction price allocated to unsatisfied performance obligations at the end of the year. Unsatisfied or partially unsatisified performance obligations at the end of the year mainly concerned contracts for the sale of electricity and power media that will end within 2020 or are concluded for an indefinite period with notice period of up to 12 months. Due to the fact that the described performance obligations are part of the contracts, that can be considered short-term, or the revenues from satisfaction of performance obligation under these contracts are recognised in the amount that the Group has the right to invoice, the Group applied a practical exception, according to which it does not disclose information about the total amount of the transaction price allocated to the performance obligation.