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Marketable debt securities - Breakdown (Details) - EUR (€)
€ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Marketable debt securities        
Financial liabilities held for trading € 79,469 € 81,167 € 77,139  
Financial liabilities designated at fair value through profit or loss 32,733 48,038 60,995  
Financial liabilities at amortized cost 1,349,169 1,248,188 1,230,745  
Marketable debt securities        
Marketable debt securities        
Financial liabilities held for trading 0 0 0  
Financial liabilities designated at fair value through profit or loss 5,454 4,440 3,758  
Financial liabilities at amortized cost 240,709 230,829 258,219  
Total financial liabilities 246,163 235,269 261,977  
Marketable debt securities | Bonds and Debentures and Subordinated Liabilities and Notes and Other Securities        
Marketable debt securities        
Total financial liabilities 246,163 235,269 261,977  
Marketable debt securities | Bonds and debentures        
Marketable debt securities        
Total financial liabilities 194,362 191,577 208,455 € 195,498
Marketable debt securities | Subordinated liabilities        
Marketable debt securities        
Total financial liabilities 25,938 21,686 20,878  
Marketable debt securities | Notes and other securities        
Marketable debt securities        
Total financial liabilities € 25,863 € 22,006 € 32,644