15 Other current assets
| (€ million) | December 31, 2017 | December 31, 2016 | ||||||
| Fair value of derivative financial instruments | 1,231 | 2,248 | ||||||
| Other current assets | 342 | 343 | ||||||
| 1,573 | 2,591 | |||||||
The fair value related to derivative financial instruments is disclosed in note 34 — Derivative financial instruments.
Other assets amounting to €342 million (€343 million at December 31, 2016) included gas volumes prepayments of €63 million that were made in previous reporting periods due to the take-or-pay obligations in the Company’s long-term supply contracts, as the Company is forecasting to make-up the underlying gas volumes in the next 12 months (€90 million at December 31, 2016). The non-current portion is indicated in note 23 — Other non-current assets.
Transactions with related parties are described in note 47 — Transactions with related parties.