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Results From Financial Transactions - Summary of Net Fair Value Changes of Financial Investments at Fair Value Through Profit or Loss, Other Than Derivatives (Detail) - EUR (€) € in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disclosure of financial instruments at fair value through profit or loss [line items]
Net Fair Value Change of Financial Investments at fair value through profit or loss	€ 279	€ (79)	€ 232
Shares [member]
Disclosure of financial instruments at fair value through profit or loss [line items]
Net Fair Value Change of Financial Investments at fair value through profit or loss	99	69	25
Debt securities and money market investments [member]
Disclosure of financial instruments at fair value through profit or loss [line items]
Net Fair Value Change of Financial Investments at fair value through profit or loss	85	(143)	127
Other [member]
Disclosure of financial instruments at fair value through profit or loss [line items]
Net Fair Value Change of Financial Investments at fair value through profit or loss	€ 95	€ (5)	€ 80

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- Definition

Disclosure of financial instruments at fair value through profit or loss.

+ References

No definition available.

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- Definition

The gains (losses) on financial assets at fair value through profit or loss that were designated as such upon initial recognition or subsequently. [Refer: Financial assets at fair value through profit or loss, designated upon initial recognition or subsequently; Gains (losses) on 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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