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Trade and other receivables (Details 2) - EUR (€) € in Millions | Dec. 31, 2017 | Dec. 31, 2016
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DisclosureOfTradeAndOtherReceivablesLineItems [Line Items] |  |
Trade receivables | € 10,182 | € 11,186
Other receivables | 5,239 | 5,864
Not later than three months [member] |  |
DisclosureOfTradeAndOtherReceivablesLineItems [Line Items] |  |
Trade receivables | 478 | 744
Other receivables | 21 | 58
Later than three months and not later than six months [member] |  |
DisclosureOfTradeAndOtherReceivablesLineItems [Line Items] |  |
Trade receivables | 46 | 49
Other receivables | 9 | 81
Later than six months and not later than one year [member] |  |
DisclosureOfTradeAndOtherReceivablesLineItems [Line Items] |  |
Trade receivables | 147 | 69
Other receivables | 202 | 249
Later than one year [member] |  |
DisclosureOfTradeAndOtherReceivablesLineItems [Line Items] |  |
Trade receivables | 144 | 322
Other receivables | 372 | 175
Total Due [Member] |  |
DisclosureOfTradeAndOtherReceivablesLineItems [Line Items] |  |
Trade receivables | 815 | 1,184
Other receivables | 604 | 563
Trade receivables neither impaired nor past due [Member] |  |
DisclosureOfTradeAndOtherReceivablesLineItems [Line Items] |  |
Trade receivables | 8,800 | 9,243
Other receivables | 4,604 | 4,869
Impaired trade receivables [Member] |  |
DisclosureOfTradeAndOtherReceivablesLineItems [Line Items] |  |
Trade receivables | 567 | 759
Other receivables | € 31 | € 432

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