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Derivative financial instruments (Details) € in Millions | Dec. 31, 2017 EUR (€) Level | Dec. 31, 2016 EUR (€) Level
--- | --- | ---
DisclosureOfDerivativeFinancialInstrumentsLineItems [Line Items] |  |  |
Derivative financial assets | [1] | € 2,590 | € 3,637
Offsetting |  | (1,279) | (1,281)
Net amount |  | 1,311 | 2,356
Fair value of derivative financial instruments |  | 1,231 | 2,248
- non-current |  | 80 | 108
Derivative financial liabilities |  | 2,381 | 3,550
Offsetting |  | (1,279) | (1,281)
Net amount |  | 1,102 | 2,269
Fair value of derivatives financial instruments |  | 1,011 | 2,108
- non-current |  | 91 | 161
Non-Hedging Derivatives [Member] |  |  |
DisclosureOfDerivativeFinancialInstrumentsLineItems [Line Items] |  |  |
Derivative financial assets |  | 1,101 | 1,014
Derivative financial liabilities |  | 1,011 | 1,115
Cash Flow Hedges [Member] |  |  |
DisclosureOfDerivativeFinancialInstrumentsLineItems [Line Items] |  |  |
Derivative financial assets |  | 262 | 310
Derivative financial liabilities |  | 21 | 168
Option Embedded in Convertible Bonds [Member] | Level 2 of fair value hierarchy [member] |  |  |
DisclosureOfDerivativeFinancialInstrumentsLineItems [Line Items] |  |  |
Derivative financial assets |  | 16 | 46
Derivative financial liabilities |  | € 16 | € 46
Level of fair value | Level |  | 2 | 2
Currency Risk [Member] | Non-Hedging Derivatives [Member] |  |  |
DisclosureOfDerivativeFinancialInstrumentsLineItems [Line Items] |  |  |
Derivative financial assets |  | € 214 | € 243
Derivative financial liabilities |  | 136 | 366
Interest Rate Risk [Member] | Non-Hedging Derivatives [Member] |  |  |
DisclosureOfDerivativeFinancialInstrumentsLineItems [Line Items] |  |  |
Derivative financial assets |  | 9 | 10
Derivative financial liabilities |  | 5 | 12
Commodity Price Risk [Member] | Non-Hedging Derivatives [Member] |  |  |
DisclosureOfDerivativeFinancialInstrumentsLineItems [Line Items] |  |  |
Derivative financial assets |  | 878 | 761
Derivative financial liabilities |  | 870 | 737
Commodity Price Risk [Member] | Trading Derivatives [Member] |  |  |
DisclosureOfDerivativeFinancialInstrumentsLineItems [Line Items] |  |  |
Derivative financial assets |  | 1,211 | 2,267
Derivative financial liabilities |  | 1,333 | 2,221
Currency Swap Contract [Member] | Currency Risk [Member] | Non-Hedging Derivatives [Member] | Level 2 of fair value hierarchy [member] |  |  |
DisclosureOfDerivativeFinancialInstrumentsLineItems [Line Items] |  |  |
Derivative financial assets |  | 170 | 188
Derivative financial liabilities |  | € 86 | € 268
Level of fair value | Level |  | 2 | 2
Interest Rate Swap Contract [Member] | Currency Risk [Member] | Non-Hedging Derivatives [Member] | Level 2 of fair value hierarchy [member] |  |  |
DisclosureOfDerivativeFinancialInstrumentsLineItems [Line Items] |  |  |
Derivative financial assets |  | € 41 | € 38
Derivative financial liabilities |  | € 45 | € 83
Level of fair value | Level |  | 2 | 2
Interest Rate Swap Contract [Member] | Interest Rate Risk [Member] | Non-Hedging Derivatives [Member] | Level 2 of fair value hierarchy [member] |  |  |
DisclosureOfDerivativeFinancialInstrumentsLineItems [Line Items] |  |  |
Derivative financial assets |  | € 9 | € 10
Derivative financial liabilities |  | € 5 | € 12
Level of fair value | Level |  | 2 | 2
Outright [Member] | Currency Risk [Member] | Non-Hedging Derivatives [Member] | Level 2 of fair value hierarchy [member] |  |  |
DisclosureOfDerivativeFinancialInstrumentsLineItems [Line Items] |  |  |
Derivative financial assets |  | € 3 | € 17
Derivative financial liabilities |  | € 5 | € 15
Level of fair value | Level |  | 2 | 2
Futures Contract [Member] | Cash Flow Hedges [Member] | Level 1 Of Fair Value Hierarchy [Member] |  |  |
DisclosureOfDerivativeFinancialInstrumentsLineItems [Line Items] |  |  |
Derivative financial assets |  | € 35 | € 1
Derivative financial liabilities |  |  | € 18
Level of fair value | Level |  | 1 | 1
Futures Contract [Member] | Commodity Price Risk [Member] | Non-Hedging Derivatives [Member] | Level 1 Of Fair Value Hierarchy [Member] |  |  |
DisclosureOfDerivativeFinancialInstrumentsLineItems [Line Items] |  |  |
Derivative financial assets |  | € 796 | € 624
Derivative financial liabilities |  | € 771 | € 611
Level of fair value | Level |  | 1 | 1
Futures Contract [Member] | Commodity Price Risk [Member] | Trading Derivatives [Member] | Level 1 Of Fair Value Hierarchy [Member] |  |  |
DisclosureOfDerivativeFinancialInstrumentsLineItems [Line Items] |  |  |
Derivative financial assets |  | € 395 | € 561
Derivative financial liabilities |  | € 390 | € 574
Level of fair value | Level |  | 1 | 1
Over the Counter Contract [Member] | Cash Flow Hedges [Member] | Level 2 of fair value hierarchy [member] |  |  |
DisclosureOfDerivativeFinancialInstrumentsLineItems [Line Items] |  |  |
Derivative financial assets |  | € 227 | € 309
Derivative financial liabilities |  | € 21 | € 150
Level of fair value | Level |  | 2 | 2
Over the Counter Contract [Member] | Commodity Price Risk [Member] | Non-Hedging Derivatives [Member] | Level 2 of fair value hierarchy [member] |  |  |
DisclosureOfDerivativeFinancialInstrumentsLineItems [Line Items] |  |  |
Derivative financial assets |  | € 81 | € 133
Derivative financial liabilities |  | € 97 | € 120
Level of fair value | Level |  | 2 | 2
Over the Counter Contract [Member] | Commodity Price Risk [Member] | Trading Derivatives [Member] | Level 2 of fair value hierarchy [member] |  |  |
DisclosureOfDerivativeFinancialInstrumentsLineItems [Line Items] |  |  |
Derivative financial assets |  | € 683 | € 1,495
Derivative financial liabilities |  | € 829 | € 1,490
Level of fair value | Level |  | 2 | 2
Option Contract [Member] | Commodity Price Risk [Member] | Non-Hedging Derivatives [Member] | Level 2 of fair value hierarchy [member] |  |  |
DisclosureOfDerivativeFinancialInstrumentsLineItems [Line Items] |  |  |
Derivative financial liabilities |  |  | € 1
Level of fair value | Level |  |  | 2
Option Contract [Member] | Commodity Price Risk [Member] | Trading Derivatives [Member] | Level 2 of fair value hierarchy [member] |  |  |
DisclosureOfDerivativeFinancialInstrumentsLineItems [Line Items] |  |  |
Derivative financial assets |  | € 133 | € 211
Derivative financial liabilities |  | € 114 | € 157
Level of fair value | Level |  | 2 | 2
Other Contract [Member] | Commodity Price Risk [Member] | Non-Hedging Derivatives [Member] | Level 2 of fair value hierarchy [member] |  |  |
DisclosureOfDerivativeFinancialInstrumentsLineItems [Line Items] |  |  |
Derivative financial assets |  | € 1 | € 4
Derivative financial liabilities |  | € 2 | € 5
Level of fair value | Level |  | 2 | 2
[1] | In the profit and loss account, economic effects were recognized as loss within &#147;Other operating income (loss)&#148; for &euro;44 million (income for &euro;17 million in 2016) and as income within &#147;Finance income (expense)&#148; for &euro;837 million (loss for &euro;482 million in 2016).

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- Definition The amount of current derivative financial assets. [Refer: Derivative financial assets] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_55&doctype=Standard -URIDate 2017-03-09 + Details
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