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Derivative financial instruments (Details) € in Millions | Dec. 31, 2018 EUR (€) bbl | Dec. 31, 2017 EUR (€) bbl
--- | --- | ---
Disclosure Of Derivative Financial Instruments [Line Items] |  |
Fair value of derivative financial instruments | € 1,594 | € 1,231
- non-current | 68 | 80
Fair value of derivatives financial instruments | 1,445 | 1,011
- non-current | 40 | 91
Non Hedging Derivatives [Member] |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |
Derivative financial assets | 1,501 | 1,101
Derivative financial liabilities | € 1,524 | € 1,011
Non Hedging Derivatives [Member] | Level 2 of fair value hierarchy [Member] |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |
Level of fair value | bbl | 2 | 2
Non Hedging Derivatives [Member] | Level 1 of fair value hierarchy [Member] |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |
Level of fair value | bbl | 1 | 1
Non Hedging Derivatives [Member] | Futures contract [Member] | Level 1 of fair value hierarchy [Member] |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |
Derivative financial assets | € 1,060 | € 796
Derivative financial liabilities | 1,107 | 771
Non Hedging Derivatives [Member] | Over the Counter Contract [Member] | Level 2 of fair value hierarchy [Member] |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |
Derivative financial assets | 306 | 81
Derivative financial liabilities | 284 | 97
Non Hedging Derivatives [Member] | Other Contracts [Member] | Level 2 of fair value hierarchy [Member] |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |
Derivative financial assets | € 1 | € 1
Level of fair value | bbl | 2 | 2
Derivative financial liabilities | € 5 | € 2
Cash flow hedge derivatives [Member] |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |
Derivative financial assets | € 337 | € 262
Level of fair value | bbl | 2 | 2
Derivative financial liabilities | € 211 | € 21
Cash flow hedge derivatives [Member] | Futures contract [Member] |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |
Level of fair value | bbl | 1 | 1
Cash flow hedge derivatives [Member] | Futures contract [Member] | Level 1 of fair value hierarchy [Member] |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |
Derivative financial assets | € 26 | € 35
Derivative financial liabilities | € 15 |
Cash flow hedge derivatives [Member] | Over the Counter Contract [Member] |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |
Level of fair value | bbl | 2 | 2
Cash flow hedge derivatives [Member] | Over the Counter Contract [Member] | Level 2 of fair value hierarchy [Member] |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |
Derivative financial assets | € 311 | € 227
Derivative financial liabilities | 196 | 21
Trading Derivatives [Member] |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |
Derivative financial assets | 1,439 | 1,211
Derivative financial liabilities | 1,365 | 1,333
Trading Derivatives [Member] | Futures contract [Member] | Level 1 of fair value hierarchy [Member] |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |
Derivative financial assets | € 367 | € 395
Level of fair value | bbl | 1 | 1
Derivative financial liabilities | € 263 | € 390
Trading Derivatives [Member] | Over the Counter Contract [Member] | Level 2 of fair value hierarchy [Member] |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |
Derivative financial assets | € 992 | € 683
Level of fair value | bbl | 2 | 2
Derivative financial liabilities | € 1,031 | € 829
Trading Derivatives [Member] | Option contract [Member] | Level 2 of fair value hierarchy [Member] |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |
Derivative financial assets | € 80 | € 133
Level of fair value | bbl | 2 | 2
Derivative financial liabilities | € 71 | € 114
Option Embedded in Convertible Bonds [Member] |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |
Derivative financial assets | 3,298 | 2,590
Offsetting | (1,636) | (1,279)
Net amount | 1,662 | 1,311
Fair value of derivative financial instruments | 1,594 | 1,231
- non-current | 68 | 80
Derivative financial liabilities | 3,121 | 2,381
Offsetting | (1,636) | (1,279)
Net amount | 1,485 | 1,102
Fair value of derivatives financial instruments | 1,445 | 1,011
- non-current | 40 | 91
Option Embedded in Convertible Bonds [Member] | Level 2 of fair value hierarchy [Member] |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |
Derivative financial assets | 21 | 16
Derivative financial liabilities | 21 | 16
Currency risk [Member] | Non Hedging Derivatives [Member] |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |
Derivative financial assets | 116 | 214
Derivative financial liabilities | 122 | 136
Currency risk [Member] | Non Hedging Derivatives [Member] | Currency swap contract [Member] | Level 2 of fair value hierarchy [Member] |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |
Derivative financial assets | € 99 | € 170
Level of fair value | bbl | 2 | 2
Derivative financial liabilities | € 46 | € 86
Currency risk [Member] | Non Hedging Derivatives [Member] | Interest rate swap contract [Member] | Level 2 of fair value hierarchy [Member] |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |
Derivative financial assets | € 14 | € 41
Level of fair value | bbl | 2 | 2
Derivative financial liabilities | € 71 | € 45
Currency risk [Member] | Non Hedging Derivatives [Member] | Outright [Member] | Level 2 of fair value hierarchy [Member] |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |
Derivative financial assets | € 3 | € 3
Level of fair value | bbl | 2 | 2
Derivative financial liabilities | € 5 | € 5
Interest Rate Risk [Member] | Non Hedging Derivatives [Member] |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |
Derivative financial assets | 18 | 9
Derivative financial liabilities | 6 | 5
Interest Rate Risk [Member] | Non Hedging Derivatives [Member] | Interest rate swap contract [Member] | Level 2 of fair value hierarchy [Member] |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |
Derivative financial assets | € 18 | € 9
Level of fair value | bbl | 2 | 2
Derivative financial liabilities | € 6 | € 5
Commodity price risk [Member] | Non Hedging Derivatives [Member] |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |
Derivative financial assets | 1,367 | 878
Derivative financial liabilities | € 1,396 | € 870

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