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Santander Group - Sale of Banco Popular's real estate business and WiZink (Details)
€ in Millions
6 Months Ended
Mar. 22, 2018
EUR (€)
Dec. 31, 2018
item
Jun. 30, 2018
EUR (€)
Jan. 02, 2018
EUR (€)
Dec. 31, 2017
EUR (€)
Disclosure of detailed information about business combination [line items]          
Investments in subsidiaries, joint ventures and associates     € 9,262 € 6,150 € 6,184
Project Quasar Investments 2017, S.L. [Member]          
Disclosure of detailed information about business combination [line items]          
Investments in subsidiaries, joint ventures and associates € 1,701   € 1,701    
Banco Popular real estate business | Project Quasar Investments 2017, S.L. [Member]          
Disclosure of detailed information about business combination [line items]          
Proportion of ownership interest in subsidiary 49.00%        
Contributed assets € 10,000        
Portion financed with debt, as a percent. 70.00%        
Banco Popular real estate business | Blackstone Fund          
Disclosure of detailed information about business combination [line items]          
Ownership interest disposed, as a percent 51.00%        
Wizink Bank, S.A. | Forecast          
Disclosure of detailed information about business combination [line items]          
Ownership interest disposed, as a percent   49.00%      
Number of operations closing | item   2