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Note 21 - Financial liabilities at amortized cost - Deposits from customers (Details) - EUR (€) € in Millions | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Deposits From Customers [Line Items] |  |
Customer deposits | € 367,312 | € 376,379
General Government [Member] |  |
Deposits From Customers [Line Items] |  |
Customer deposits | 25,576 | 23,210
Demand Deposits [Member] |  |
Deposits From Customers [Line Items] |  |
Customer deposits | 230,248 | 223,497
Savings Accounts [Member] |  |
Deposits From Customers [Line Items] |  |
Customer deposits | 105,839 | 116,538
Repurchase Agreements [Member] |  |
Deposits From Customers [Line Items] |  |
Customer deposits | 1,488 | 9,076
Subordinated Accounts [Member] |  |
Deposits From Customers [Line Items] |  |
Customer deposits | 201 | 194
Other Accounts [Member] |  |
Deposits From Customers [Line Items] |  |
Customer deposits | 3,960 | 3,864
Total [Member] |  |
Deposits From Customers [Line Items] |  |
Customer deposits | 367,312 | 376,379
Total [Member] | Of Which: Domestic currency deposits from customers [Member] |  |
Deposits From Customers [Line Items] |  |
Customer deposits | 179,294 | 184,150
Total [Member] | Of Which: Foreign currency deposits from customers [Member] |  |
Deposits From Customers [Line Items] |  |
Customer deposits | € 188,018 | € 192,229

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- Definition The amount of deposit liabilities from customers held by the entity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_55&doctype=Standard -URIDate 2017-03-09 + Details
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