Trade and other receivables - Valuation allowance for doubtful accounts (Details) - Trade and other receivables - Accumulated impairment - EUR (€) € in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Trade and other receivables
Financial assets at beginning of period	€ 3,150	€ 2,639
Deductions	(603)	(721)
Other changes	79	307
Financial assets at end of period	3,246	3,150
Increase (decrease) due to application of IFRS 9
Trade and other receivables
Financial assets at beginning of period		427
In accordance with IFRS 9
Trade and other receivables
Financial assets at beginning of period		3,066
Performing receivables
Trade and other receivables
Additions	95	126
Deductions	(119)	(189)
Defaulted receivables
Trade and other receivables
Additions	525	372
Deductions	€ (484)	€ (532)

The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to receive a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose the entity’s own equity instruments do not include puttable financial instruments classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. [Refer: Financial instruments, class [member]; Financial liabilities]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
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Reference 5: http://www.xbrl.org/2003/role/exampleRef
-Name IFRS
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