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Financial Instruments Fair Value Risk - Summary of Reconciliation of Movements in Level 3 Valuations (Detail) - Fair value [Member] - Level 3 Fair Value Measurements of Financial Assets [Member] - EUR (€) € in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure of Fair Value Measurement of Assets [Line Items]
Assets beginning balance	€ (106)	€ 346
Gains and losses recognised in profit and loss	26	94
Gains and losses recognised in other comprehensive income	2	(12)
Purchases and new issues	(89)	(247)
Sales and settlements	(17)	(187)
Transfers into Level 3	83
Transfers out of Level 3		(100)
Assets ending balance	€ (101)	€ (106)

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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

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The fair value of financial assets. [Refer: At fair value [member]; Financial assets]

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The gains (losses) recognised in other comprehensive income on the fair value measurement of assets. [Refer: At fair value [member]; Other comprehensive income]

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The amount of transfers of assets into Level 3 of the fair value hierarchy. [Refer: Level 3 of fair value hierarchy [member]]

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