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Results From Financial Transactions - Summary of Realized Gains and Losses on Financial Investment Comprise (Detail) - EUR (€) € in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Realized gains and losses on financial investments [line items]
Realized gains and losses on financial investments	€ 399	€ (92)	€ 431
Available-for-sale investments [member]
Realized gains and losses on financial investments [line items]
Realized gains and losses on financial investments	368	(108)	411
Loans [member]
Realized gains and losses on financial investments [line items]
Realized gains and losses on financial investments	€ 32	€ 16	€ 20

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- Definition

Realized gains and losses on financial investments [Line items]

+ References

No definition available.

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- Definition

The gains (losses) on financial assets at fair value through profit or loss. [Refer: Financial assets at fair value through profit or loss]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2019-01-01
-Paragraph 20
-Subparagraph a
-Clause i
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_20_a_i&doctype=Standard
-URIDate 2019-03-27

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