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Results From Financial Transactions - Summary of Realized Gains and Losses on Financial Investments (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
Shares [member]
Realized gains and losses on financial investments [line items]
Realized gains and losses on financial investments	11	25	165
Debt securities and money market investments [member]
Realized gains and losses on financial investments [line items]
Realized gains and losses on financial investments	372	(147)	242
Loans [member]
Realized gains and losses on financial investments [line items]
Realized gains and losses on financial investments	32	16	20
Other [member]
Realized gains and losses on financial investments [line items]
Realized gains and losses on financial investments	€ (16)	€ 14	€ 3

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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
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-URIDate 2019-03-27

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