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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
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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 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 + Details
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