33 Other non-current liabilities
| (€ million) | December 31, 2017 | December 31, 2016 | ||||||
| Fair value of derivatives financial instruments | 91 | 161 | ||||||
| Income tax liabilities | 36 | 35 | ||||||
| Other payables towards tax authorities | 9 | 9 | ||||||
| Cautionary deposits | 255 | 265 | ||||||
| Other payables | 45 | 51 | ||||||
| Other liabilities | 1,043 | 1,247 | ||||||
| 1,479 | 1,768 | |||||||
Fair value related to derivative financial instruments is disclosed in note 34 — Derivative financial instruments.
Cautionary deposits of €255 million (€265 million at December 31, 2016) related for €215 million (€224 million at December 31 2016) to deposits from retail customers for the supply of gas and electricity.
Other liabilities of €1,043 million (€1,247 million at December 31, 2016) included advances received from Suez following a long-term agreement for supplying natural gas and electricity of €584 million (€664 million at December 31, 2016). The current portion is described in note 28 — Other current liabilities.
Liabilities with related parties are described in note 47 — Transactions with related parties.