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Trade and Other Current Receivables - Summary of Aging of Trade Receivables (Detail) - EUR (€) € in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Aging Of Current Trade Receivables [line items] |  |
Total trade receivables | € 3,599 | € 3,472
Less impairment provision for trade receivables | (160) | (143)
Trade receivables | 3,439 | 3,329
Not overdue [Member] |  |
Aging Of Current Trade Receivables [line items] |  |
Trade receivables | 2,714 | 2,537
Past due less than three months [Member] |  |
Aging Of Current Trade Receivables [line items] |  |
Trade receivables | 621 | 666
Past due more than three months but less than six months [Member] |  |
Aging Of Current Trade Receivables [line items] |  |
Trade receivables | 95 | 102
Past due more than six months but less than one year [Member] |  |
Aging Of Current Trade Receivables [line items] |  |
Trade receivables | 59 | 69
Past due more than one year [Member] |  |
Aging Of Current Trade Receivables [line items] |  |
Trade receivables | € 110 | € 98

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