Income taxes - Changes net deferred taxes (Details) - EUR (€) € in Millions	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Movements in net deferred tax balance
Net deferred tax balance, as of January 1	€ 5,298	€ 2,573
Recognized in income statement, Continuing operations	(666)	991	€ (88)
Recognized in income statement, Discontinuing operations	2	(2)
Recognized in other comprehensive income	(150)	(255)
Recognized in equity	(7)	(5)
Acquisitions through business combinations and disposals	(29)	1,914
Translation differences	(279)	82
Net deferred tax balance, as of December 31	€ 4,169	€ 5,298	€ 2,573

The amount of tax expense or income relating to changes in deferred tax liabilities and deferred tax assets, recognised in profit or loss. [Refer: Deferred tax assets; Deferred tax expense (income); Deferred tax liabilities]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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The amount of deferred tax liabilities or assets. [Refer: Deferred tax liabilities; Deferred tax assets]

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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The amount of deferred tax related to items credited (charged) directly to equity. [Refer: Deferred tax expense (income)]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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The increase (decrease) in deferred tax liability (asset) resulting from business combinations. [Refer: Deferred tax liability (asset)]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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The increase (decrease) in deferred tax liability (asset) resulting from the net exchange differences arising when the financial statements are translated from the functional currency into a different presentation currency, including the translation of a foreign operation into the presentation currency of the reporting entity. [Refer: Deferred tax liability (asset)]

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The amount of tax expense or income relating to changes in deferred tax liabilities and deferred tax assets, recognized in profit or loss from discontinued operations.

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The amount of deferred income tax relating to amounts recognised in other comprehensive income.

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