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Consolidated statement of cash flows (Parenthetical)
€ in Millions
12 Months Ended
Dec. 31, 2017
EUR (€)
Statement of cash flows [Line items]  
Purchase of current available-for-sale investments, liquid assets € 2,729
Proceeds from maturities and sale of current available-for-sale investments, liquid assets 3,265
Alcatel Lucent  
Statement of cash flows [Line items]  
Purchase of current available-for-sale investments, liquid assets 724
Proceeds from maturities and sale of current available-for-sale investments, liquid assets € 724