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Receivables - Allowance for doubtful accounts receivable (Detail) - Doubtful accounts receivable [Member] - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of receivables [Line items]      
Allowance to doubtful accounts, beginning of period € 318 € 301 € 227
Additions charged to expense 41 76 78
Deductions from allowance (36) (64) (25)
Transfer to assets classified as held for sale (92)    
Other movements (16) 5 21
Allowance to doubtful accounts, end of period € 215 € 318 € 301