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Costs (Details 5) - EUR (€) € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
DisclosureOfOperatingExpensesLineItems [Line Items] |  |  |
Other operating income (expense) | € (32) | € 16 | € (485)
Derivatives [member] |  |  |
DisclosureOfOperatingExpensesLineItems [Line Items] |  |  |
Other operating income (expense) | (44) | 17 | (487)
Cash flow hedges [member] |  |  |
DisclosureOfOperatingExpensesLineItems [Line Items] |  |  |
Other operating income (expense) | € 12 | € (1) | € 2

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