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Results From Financial Transactions - Summary of Realized Gains and Losses on Financial Investments (Detail) - EUR (€) € in Millions | 12 Months Ended
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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. + Details
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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 + Details
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