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Results from Financial Transactions - Summary of Net Fair Value Change on Borrowings and Other Financial Liabilities (Detail) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of financial liabilities [line items] |  |  |
Gain Losses on Fair Value Change on Borrowings and Other Financial Liabilities | € 15 | € 29 | € 10
Borrowings [member] |  |  |
Disclosure of financial liabilities [line items] |  |  |
Gain Losses on Fair Value Change on Borrowings and Other Financial Liabilities | 8 | 23 | € 10
Other financial liabilitiy [member] |  |  |
Disclosure of financial liabilities [line items] |  |  |
Gain Losses on Fair Value Change on Borrowings and Other Financial Liabilities | € 7 | € 6 |

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Details
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- Details
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