Income Taxes - Summary of Reconciliation Between Standard and Effective Income Tax (Detail) - EUR (€) € in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Reconciliation between standard and effective income tax:
Income before tax	€ 751	€ 2,534	€ 610
Income tax calculated using weighted average applicable statutory tax rates	178	745	239
Difference due to the effects of:
Non-taxable income	(80)	(157)	(126)
Non-tax deductible expenses	28	28	21
Changes in tax rate/base	(30)	(550)	93
Different tax rates on overseas earnings		(1)	8
Tax credits	(68)	(67)	(41)
Other taxes	29	67	38
Adjustments to prior years	11	2	(34)
Origination and change in contingencies	2	9	8
Changes in deferred tax assets as a result of recognition / write off of previously not recognized / recognized tax losses, tax credits and deductible temporary differences	(35)	(45)	(54)
Non-recognition of deferred tax assets	17	41	33
Tax effect of (profit) / losses from joint ventures and associates	(9)	(7)	(7)
Other	(3)	(1)	(6)
Difference due to effects of income tax	(138)	(680)	(67)
Income tax for the period (income) / charge	€ 40	€ 65	€ 172

Difference due to effects of income tax for period income or charge with applicable tax rates.

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Difference due to effects of income tax for period (income) / charge with applicable tax rates.

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Non recognition of deferred tax assets.

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Tax effect of adjustments for current and deferred tax of prior periods.

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Tax effect of origination and change in contingencies.

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Tax effect of other taxes.

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Tax effect of (profit) / losses from joint ventures and associates.

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The amount of profit (loss) for a period before deducting tax expense. [Refer: Profit (loss)]

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The aggregate amount included in the determination of profit (loss) for the period in respect of current tax and deferred tax. [Refer: Current tax expense (income); Deferred tax expense (income)]

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The amount that represents the difference between the tax expense (income) and the product of the accounting profit multiplied by the applicable tax rate(s) that the entity does not separately disclose in the same statement or note. [Refer: Accounting profit; Applicable tax rate]

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The amount of benefit arising from a previously unrecognised tax loss, tax credit or temporary difference of a prior period that is used to reduce deferred tax expense. [Refer: Deferred tax expense (income); Temporary differences [member]; Unused tax losses [member]; Unused tax credits [member]]

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The amount that represents the difference between the tax expense (income) and the product of the accounting profit multiplied by the applicable tax rate(s) that relates to changes in the tax rate. [Refer: Accounting profit]

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The amount that represents the difference between the tax expense (income) and the product of the accounting profit multiplied by the applicable tax rate(s) that relates to expenses not deductible in determining taxable profit (tax loss). [Refer: Accounting profit]

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The amount that represents the difference between the tax expense (income) and the product of the accounting profit multiplied by the applicable tax rate(s) that relates to foreign tax rates. [Refer: Accounting profit]

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The amount that represents the difference between the tax expense (income) and the product of the accounting profit multiplied by the applicable tax rate(s) that relates to revenues that are exempt from taxation. [Refer: Accounting profit]

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The amount that represents the difference between the tax expense (income) and the product of the accounting profit multiplied by the applicable tax rate(s) that relates to tax losses. [Refer: Accounting profit]

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The product of the accounting profit multiplied by the applicable tax rate(s). [Refer: Accounting profit; Applicable tax rate]

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