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Derivative financial instruments (Details 4) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |
Finance Income (expense) on derivative financial instruments | € (307) | € 837 | € (482)
Derivatives On Exchange Rate [Member] |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |
Finance Income (expense) on derivative financial instruments | (329) | 809 | (494)
Derivatives On Interest Rate [Member] |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |
Finance Income (expense) on derivative financial instruments | € 22 | € 28 | (12)
Options [Member] |  |  |
Disclosure Of Derivative Financial Instruments [Line Items] |  |  |
Finance Income (expense) on derivative financial instruments |  |  | € 24

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- Definition The amount of income or cost from derivatives financial instruments. + References No definition available. + Details
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