Income Taxes - Summary of Income Tax Related to Components of Other Comprehensive Income and Retained Earnings (Detail) - EUR (€) € in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Items that will not be reclassified to profit and loss:
Changes in revaluation reserve real estate held for own use	€ 7	€ 9	€ (3)
Remeasurements of defined benefit plans	(15)	(175)	89
Income tax will not be reclassified to profit or loss	(8)	(166)	86
Items that may be reclassified subsequently to profit and loss:
Gains / losses on revaluation of available-for-sale investments	530	(134)	(187)
Gains / losses transferred to the income statement on disposal and impairment of available- for-sale investments	(17)	441	427
Changes in cash flow hedging reserve	1	567	24
Movement in foreign currency translation and net foreign investment hedging reserve	(20)	76	(39)
Income tax will be reclassified to profit or loss	493	951	225
Total income tax related to components of other comprehensive income	485	785	311
Income tax related to equity instruments and other
Income tax related to equity instruments	38	44	44
Other	(12)	14	(3)
Total income tax recognised directly in retained earnings	€ 26	€ 58	€ 41

Income tax related to equity instruments.

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- Definition

Income tax related to other.

+ References

No definition available.

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- Definition

Income tax relating to gains losses on revaluation of availableforsale financial assets of other comprehensive income.

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No definition available.

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- Definition

Income tax relating to gains losses transferred to the income statement on disposal and impairment of available for sale financial assets of other comprehensive income.

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No definition available.

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- Definition

The aggregate current and deferred tax relating to particular items that are charged or credited directly to equity, for example: (a) an adjustment to the opening balance of retained earnings resulting from either a change in accounting policy that is applied retrospectively or the correction of an error; and (b) amounts arising on initial recognition of the equity component of a compound financial instrument. [Refer: Deferred tax relating to items credited (charged) directly to equity; Retained earnings; Financial instruments, class [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 12
-IssueDate 2018-01-01
-Paragraph 81
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No definition available.

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- Definition

The amount of income tax relating to amounts recognised in other comprehensive income in relation to cash flow hedges. [Refer: Cash flow hedges [member]; Other comprehensive income]

+ References

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

The amount of income tax relating to amounts recognised in other comprehensive income in relation to changes in a revaluation surplus. [Refer: Revaluation surplus; Other comprehensive income]

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- Definition

The amount of income tax relating to amounts recognised in other comprehensive income. [Refer: Other comprehensive income]

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- Definition

The amount of income tax relating to amounts recognised in other comprehensive income that will be reclassified to profit or loss. [Refer: Income tax relating to components of other comprehensive income]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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The amount of income tax relating to amounts recognised in other comprehensive income that will not be reclassified to profit or loss. [Refer: Income tax relating to components of other comprehensive income]

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- Definition

The amount of income tax relating to amounts recognised in other comprehensive income in relation to hedges of net investments in foreign operations. [Refer: Other comprehensive income]

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- Definition

The amount of income tax relating to amounts recognised in other comprehensive income in relation to remeasurements of defined benefit plans. [Refer: Other comprehensive income; Reserve of remeasurements of defined benefit plans; Defined benefit plans [member]]

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