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Taxation - Summary of Tax Charge in Income Statement (Detail) - EUR (€) € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Current tax |  |  |
Current year | € (2,398) | € (2,026) | € (1,992)
Over/(under) provided in prior years | (21) | 158 | (57)
Current tax expense (income) | (2,419) | (1,868) | (2,049)
Deferred tax |  |  |
Origination and reversal of temporary differences | 51 | (65) | 82
Changes in tax rates | 609 | (7) | (13)
Recognition of previously unrecognised losses brought forward | 92 | 18 | 19
Deferred tax expense (income) | 752 | (54) | 88
Total tax expense (income) | € (1,667) | € (1,922) | € (1,961)

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- Definition The amount of tax expense (income) relating to changes in deferred tax liabilities and deferred tax assets. [Refer: Deferred tax assets; Deferred tax liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2016-01-13 -Paragraph 81 -Subparagraph g -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2016-03-30&anchor=para_81_g_ii&doctype=Standard -URIDate 2016-03-31 + Details
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