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Trade and other receivables (Details 4) € in Millions | 12 Months Ended
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Dec. 31, 2018 EUR (€) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 EUR (€)
Disclosure Of Trade And Other Receivables [Line Items] |  |  |
Reversal, allowance account for credit losses of financial assets | € (120) |  |
Additional allowance recognised in profit or loss, allowance account for credit losses of financial assets | 498 |  |
Carrying amount, End of period | 3,150 |  |
Changes in accounting policies (IFRS 9) | 294 |  |
Performing receivables [Member] |  |  |
Disclosure Of Trade And Other Receivables [Line Items] |  |  |
Reversal, allowance account for credit losses of financial assets | (189) |  |
Defaulted receivables [Member] |  |  |
Disclosure Of Trade And Other Receivables [Line Items] |  |  |
Reversal, allowance account for credit losses of financial assets | (532) |  |
Carrying amount, End of period | 2,237 |  |
Trade receivables [member] |  |  |
Disclosure Of Trade And Other Receivables [Line Items] |  |  |
Carrying amount, Beginning of period | 2,639 | $ 2,639 |
Other changes | 307 |  |
Carrying amount, End of period | 3,150 |  | € 2,639
Trade receivables [member] | Performing receivables [Member] |  |  |
Disclosure Of Trade And Other Receivables [Line Items] |  |  |
Net Additional Allowance Recognised In Profit Or Loss Allowance Account For Credit Losses Of Financial Assets | 126 |  |
Trade receivables [member] | Defaulted receivables [Member] |  |  |
Disclosure Of Trade And Other Receivables [Line Items] |  |  |
Net Additional Allowance Recognised In Profit Or Loss Allowance Account For Credit Losses Of Financial Assets | € 372 |  |
Trade receivables [member] | Previously stated [member] |  |  |
Disclosure Of Trade And Other Receivables [Line Items] |  |  |
Carrying amount, Beginning of period |  |  | 2,303
Additional allowance recognised in profit or loss, allowance account for credit losses of financial assets |  |  | 927
Deductions |  |  | (454)
Other changes |  |  | € (137)
Trade receivables [member] | Increase Decrease Due To Application Of IFRS 9 [Member] |  |  |
Disclosure Of Trade And Other Receivables [Line Items] |  |  |
Changes in accounting policies (IFRS 9) | $ |  | $ 427 |

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