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Guarantees, commitments and risks (Details) - EUR (€) € in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Disclosure Of Contingent Liabilities Explanatory [Line Items] |  |
Guarantees | € 9,497 | € 16,174
Consolidated Subsidiaries [Member] |  |
Disclosure Of Contingent Liabilities Explanatory [Line Items] |  |
Guarantees | 5,082 | 5,595
Unconsolidated subsidiaries [member] |  |
Disclosure Of Contingent Liabilities Explanatory [Line Items] |  |
Guarantees | 196 | 181
Joint ventures and associates [Member] |  |
Disclosure Of Contingent Liabilities Explanatory [Line Items] |  |
Guarantees | 4,056 | 10,046
Others [Member] |  |
Disclosure Of Contingent Liabilities Explanatory [Line Items] |  |
Guarantees | € 163 | € 352

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