Financial risk management - Allowances for doubtful accounts (Details) - EUR (€) € in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of nature and extent of risks arising from financial instruments [line items]
Beginning balance	€ 6,880
Charged to income statement	55	€ 244	€ 125
Ending balance	4,856	6,880
Accumulated impairment
Disclosure of nature and extent of risks arising from financial instruments [line items]
Beginning balance	192
Ending balance	195	192
Credit risk \| Accumulated impairment
Disclosure of nature and extent of risks arising from financial instruments [line items]
Beginning balance	192	168	62
Charged to income statement	86	61	126
Deductions	(83)	(37)	(20)
Ending balance	€ 195	€ 192	€ 168

Adjustments for impairment loss (reversal of impairment loss) recognised in profit or loss to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Impairment loss (reversal of impairment loss) recognised in profit or loss]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

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The amount of current trade receivables and current other receivables. [Refer: Current trade receivables; Other current receivables]

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The decrease in an allowance account for credit losses of financial assets resulting from the utilisation or reversal of the allowance.

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