Results From Financial Transactions - Summary of Net Fair Value Change of Derivatives (Detail) - EUR (€) € in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Net fair value change of derivatives [abstract]
Net fair value change on economic hedges where no hedge accounting is applied	€ 272	€ 70	€ 793
Net fair value change on bifurcated embedded derivatives	(824)	(1,231)	(565)
Ineffective portion of hedge transactions to which hedge accounting is applied	7	2	12
Total	€ (545)	€ (1,159)	€ 239

Net fair value change of derivatives.

No definition available.

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- Definition

Net fair value changes on bifurcated embedded derivatives.

+ References

No definition available.

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- Definition

The gain (loss) on the change in fair value of the hedged item used as a basis for recognising hedge ineffectiveness. Hedge ineffectiveness is the extent to which the changes in the fair value or the cash flows of the hedging instrument are greater or less than those on the hedged item.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2018-01-01
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
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-Paragraph 24B
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- Definition

The gains (losses) resulting from change in the fair value of derivatives recognised in profit or loss. [Refer: Derivatives [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
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- Definition

A component of equity representing the reserve of cash flow hedges in relation to hedging relationships for which hedge accounting is no longer applied. [Refer: Reserve of cash flow hedges]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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