Document and Entity Information
12 Months Ended
Dec. 31, 2018
shares
Document and Entity Information [Abstract] 
Entity Registrant NameBanco Santander, S.A.
Entity Central Index Key0000891478
Document Type20-F
Document Period End DateDec. 31, 2018
Amendment Flagfalse
Current Fiscal Year End Date--12-31
Entity Well-known Seasoned IssuerYes
Entity Voluntary FilersNo
Entity Current Reporting StatusYes
Entity Filer CategoryLarge Accelerated Filer
Entity Emerging Growth Companyfalse
Entity Common Stock, Shares Outstanding16,236,573,942
Document Fiscal Year Focus2018
Document Fiscal Period FocusFY
Entity Shell Companyfalse

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