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Derivative financial instruments (Tables) | 12 Months Ended
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Dec. 31, 2018
Disclosure Of Derivative Financial Instruments [Line Items] |
Disclosure of fair value measurement [text block] |
|  | December 31, 2018 |  |  | December 31, 2017 |
(€ million) |  | Fair value asset |  |  | Fair value liability |  |  | Level of Fair value |  |  | Fair value asset |  |  | Fair value liability |  |  | Level of Fair value |
Non-hedging derivatives |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives on exchange rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
- Currency swap |  |  | 99 |  |  |  | 46 |  |  |  | 2 |  |  |  | 170 |  |  |  | 86 |  |  |  | 2 |
- Interest currency swap |  |  | 14 |  |  |  | 71 |  |  |  | 2 |  |  |  | 41 |  |  |  | 45 |  |  |  | 2 |
- Outright |  |  | 3 |  |  |  | 5 |  |  |  | 2 |  |  |  | 3 |  |  |  | 5 |  |  |  | 2 |
|  |  | 116 |  |  |  | 122 |  |  |  |  |  |  |  | 214 |  |  |  | 136 |  |  |  |  |
Derivatives on interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
- Interest rate swap |  |  | 18 |  |  |  | 6 |  |  |  | 2 |  |  |  | 9 |  |  |  | 5 |  |  |  | 2 |
|  |  | 18 |  |  |  | 6 |  |  |  |  |  |  |  | 9 |  |  |  | 5 |  |  |  |  |
Derivatives on commodities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
- Future |  |  | 1,060 |  |  |  | 1,107 |  |  |  | 1 |  |  |  | 796 |  |  |  | 771 |  |  |  | 1 |
- Over the counter |  |  | 306 |  |  |  | 284 |  |  |  | 2 |  |  |  | 81 |  |  |  | 97 |  |  |  | 2 |
- Other |  |  | 1 |  |  |  | 5 |  |  |  | 2 |  |  |  | 1 |  |  |  | 2 |  |  |  | 2 |
|  |  | 1,367 |  |  |  | 1,396 |  |  |  |  |  |  |  | 878 |  |  |  | 870 |  |  |  |  |
|  |  | 1,501 |  |  |  | 1,524 |  |  |  |  |  |  |  | 1,101 |  |  |  | 1,011 |  |  |  |  |
Trading derivatives |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives on commodities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
- Over the counter |  |  | 992 |  |  |  | 1,031 |  |  |  | 2 |  |  |  | 683 |  |  |  | 829 |  |  |  | 2 |
- Future |  |  | 367 |  |  |  | 263 |  |  |  | 1 |  |  |  | 395 |  |  |  | 390 |  |  |  | 1 |
- Options |  |  | 80 |  |  |  | 71 |  |  |  | 2 |  |  |  | 133 |  |  |  | 114 |  |  |  | 2 |
|  |  | 1,439 |  |  |  | 1,365 |  |  |  |  |  |  |  | 1,211 |  |  |  | 1,333 |  |  |  |  |
Cash flow hedge derivatives |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives on commodities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
- Over the counter |  |  | 311 |  |  |  | 196 |  |  |  | 2 |  |  |  | 227 |  |  |  | 21 |  |  |  | 2 |
- Future |  |  | 26 |  |  |  | 15 |  |  |  | 1 |  |  |  | 35 |  |  |  |  |  |  |  | 1 |
|  |  | 337 |  |  |  | 211 |  |  |  |  |  |  |  | 262 |  |  |  | 21 |  |  |  |  |
Option embedded in convertible bonds |  |  | 21 |  |  |  | 21 |  |  |  | 2 |  |  |  | 16 |  |  |  | 16 |  |  |  | 2 |
Gross amount |  |  | 3,298 |  |  |  | 3,121 |  |  |  |  |  |  |  | 2,590 |  |  |  | 2,381 |  |  |  |  |
Offsetting |  |  | (1,636 | ) |  |  | (1,636 | ) |  |  |  |  |  |  | (1,279 | ) |  |  | (1,279 | ) |  |  |  |
Net amount |  |  | 1,662 |  |  |  | 1,485 |  |  |  |  |  |  |  | 1,311 |  |  |  | 1,102 |  |  |  |  |
Of which: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
- current |  |  | 1,594 |  |  |  | 1,445 |  |  |  |  |  |  |  | 1,231 |  |  |  | 1,011 |  |  |  |  |
- non-current |  |  | 68 |  |  |  | 40 |  |  |  |  |  |  |  | 80 |  |  |  | 91 |  |  |  |  |
Disclosure of derivative financial instruments [text block] | Hedging derivative instruments are disclosed below:
|  | December 31, 2018 |
(€ million) |  | Nominal amount of the hedging instrument |  |  | Change in fair value (effective hedge) |  |  | Change in fair value (ineffective hedge) |
Cash flow hedge derivatives |  |  |  |  |  |  |  |  |  |  |  |
Derivatives on commodity |  |  |  |  |  |  |  |  |  |  |  |
- Over the counter |  |  | 3,528 |  |  |  | 404 |  |  |  | 2 |
- Future |  |  | 71 |  |  |  | (6 | ) |  |  | (2 | )
|  |  | 3,599 |  |  |  | 398 |  |  |  |  |
Disclosure of detailed information about type of risk hedged under cash flow hedge [text block] | The breakdown of the underlying asset or liability by type of risk hedged under cash flow hedge is provided below:
|  | December 31, 2018 |
(€ million) |  | Change of the underlying asset used for the calculation of hedging ineffectiveness |  |  | CFH reserve |  |  | Reclassification adjustments |
Cash flow hedge |  |  |  |  |  |  |  |  |  |  |  |
Commodity price risk |  |  |  |  |  |  |  |  |  |  |  |
- Forecast sales |  |  | (389 | ) |  |  | (13 | ) |  |  | 642 |
|  |  | (389 | ) |  |  | (13 | ) |  |  | 642 |
Disclosure of detailed information about other operating income loss [text block] | Other operating profit (loss) related to derivative financial instruments on commodity was as follows:
(€ million) |  | 2018 |  |  | 2017 |  |  | 2016 |
Net income (loss) on cash flow hedging derivatives |  |  |  |  |  |  | 12 |  |  |  | (1 | )
Net income (loss) on other derivatives |  |  | 129 |  |  |  | (44 | ) |  |  | 17 |
|  |  | 129 |  |  |  | (32 | ) |  |  | 16 |
Disclosure of detailed information about finance income loss on derivative financial instruments [text block] | Finance income (loss) on derivative financial instruments consisted of the following:
(€ million) |  | 2018 |  |  | 2017 |  |  | 2016 |
Derivatives on exchange rate |  |  | (329 | ) |  |  | 809 |  |  |  | (494 | )
Derivatives on interest rate |  |  | 22 |  |  |  | 28 |  |  |  | (12 | )
Options |  |  |  |  |  |  |  |  |  |  | 24 |
|  |  | (307 | ) |  |  | 837 |  |  |  | (482 | )

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- Definition The disclosure of detailed information about the analysis of net income (loss) on commodity derivatives. + References No definition available. + Details
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- Definition The disclosure of derivative financial instruments. [Refer: Derivatives [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 10 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_10_e&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The entire disclosure for fair value measurement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2018-01-01 -Section Disclosure -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=13&date=2018-03-01&anchor=sect_Disclosure&doctype=Standard -URIDate 2018-03-16 + Details
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