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Income Tax Matters - Tax Payables and Receivables (Details) - EUR (€)
€ in Millions
Dec. 31, 2017
Dec. 31, 2016
Income Taxes [Abstract]    
Tax withholdings € 154 € 81
Indirect taxes 1,030 1,086
Social security 151 157
Current income taxes payable 580 486
Other 426 522
Total 2,341 2,332
Indirect tax 618 790
Current income taxes receivable 618 601
Other 139 142
Total € 1,375 € 1,533