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Treasury Risk Management - Impact of Interest Rate Swaps and Cross-Currency Swaps (Detail) - EUR (€) € in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Disclosure Of Impact Of Interest Rate Swaps And Cross Currency Swaps [Line Items] |  |
Cash and cash equivalents | € 3,317 | € 3,382
Current other financial assets | 770 | 599
Current financial liabilities | (7,968) | (5,450)
Non-current financial liabilities | 16,462 | 11,145
Fixed and Floating Interest Rate [Member] |  |
Disclosure Of Impact Of Interest Rate Swaps And Cross Currency Swaps [Line Items] |  |
Cash and cash equivalents | 3,317 | 3,382
Current other financial assets | 770 | 599
Current financial liabilities | (7,968) | (5,450)
Non-current financial liabilities | (16,462) | (11,145)
Net debt | (20,343) | (12,614)
Fixed rate (weighted average amount of fixing for the following year) | € (16,216) | € (11,539)

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