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Guarantees, commitments and risks (Details) - EUR (€) € in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
DisclosureOfContingentLiabilitiesExplanatoryLineItems [Line Items] |  |
Guarantees | € 16,174 | € 14,553
Consolidated Subsidiaries [Member] |  |
DisclosureOfContingentLiabilitiesExplanatoryLineItems [Line Items] |  |
Guarantees | 5,594 | 5,868
Unconsolidated Subsidiaries [Member] |  |
DisclosureOfContingentLiabilitiesExplanatoryLineItems [Line Items] |  |
Guarantees | 181 | 246
Consolidated Joint Operations [Member] |  |
DisclosureOfContingentLiabilitiesExplanatoryLineItems [Line Items] |  |
Guarantees | 1 | 1
Joint ventures and associates [Member] |  |
DisclosureOfContingentLiabilitiesExplanatoryLineItems [Line Items] |  |
Guarantees | 10,046 | 8,236
Others [Member] |  |
DisclosureOfContingentLiabilitiesExplanatoryLineItems [Line Items] |  |
Guarantees | 352 | 202
Other Guarantees [Member] |  |
DisclosureOfContingentLiabilitiesExplanatoryLineItems [Line Items] |  |
Guarantees | 10,050 | 8,429
Other Guarantees [Member] | Consolidated Subsidiaries [Member] |  |
DisclosureOfContingentLiabilitiesExplanatoryLineItems [Line Items] |  |
Guarantees | 5,594 | 5,868
Other Guarantees [Member] | Unconsolidated Subsidiaries [Member] |  |
DisclosureOfContingentLiabilitiesExplanatoryLineItems [Line Items] |  |
Guarantees | 181 | 246
Other Guarantees [Member] | Consolidated Joint Operations [Member] |  |
DisclosureOfContingentLiabilitiesExplanatoryLineItems [Line Items] |  |
Guarantees | 1 | 1
Other Guarantees [Member] | Joint ventures and associates [Member] |  |
DisclosureOfContingentLiabilitiesExplanatoryLineItems [Line Items] |  |
Guarantees | 3,922 | 2,112
Other Guarantees [Member] | Others [Member] |  |
DisclosureOfContingentLiabilitiesExplanatoryLineItems [Line Items] |  |
Guarantees | 352 | 202
Unsecured Guarantees [Member] |  |
DisclosureOfContingentLiabilitiesExplanatoryLineItems [Line Items] |  |
Guarantees | 6,124 | 6,124
Unsecured Guarantees [Member] | Joint ventures and associates [Member] |  |
DisclosureOfContingentLiabilitiesExplanatoryLineItems [Line Items] |  |
Guarantees | € 6,124 | € 6,124

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- Definition The amount of the exposure to credit risk on loan commitments and financial guarantee contracts. [Refer: Loan commitments [member]; Financial guarantee contracts [member]; Credit risk [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 35H -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_35H&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 35I -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_35I&doctype=Standard -URIDate 2017-03-09 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 35M -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_35M&doctype=Standard -URIDate 2017-03-09 + Details
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