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Marketable debt securities - Bonds and debentures maturities (Details) - EUR (€)
€ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Marketable debt securities      
Notional amount € 392,948 € 360,626 € 362,464
Within 1 month      
Marketable debt securities      
Notional amount 27,317 20,056 25,057
1 to 3 months      
Marketable debt securities      
Notional amount 20,340 30,936 24,694
3 to 12 months      
Marketable debt securities      
Notional amount 78,813 101,855 96,106
More than 5 years      
Marketable debt securities      
Notional amount 45,901 49,392 60,422
Marketable debt securities      
Marketable debt securities      
Financial liabilities 246,163 235,269 261,977
Marketable debt securities | Debt securities issued      
Marketable debt securities      
Financial liabilities 246,163    
Notional amount 247,009    
Marketable debt securities | Debt securities issued | On demand      
Marketable debt securities      
Financial liabilities 0    
Notional amount 0    
Marketable debt securities | Debt securities issued | Within 1 month      
Marketable debt securities      
Financial liabilities 13,907    
Notional amount 14,067    
Marketable debt securities | Debt securities issued | 1 to 3 months      
Marketable debt securities      
Financial liabilities 18,358    
Notional amount 18,508    
Marketable debt securities | Debt securities issued | 3 to 12 months      
Marketable debt securities      
Financial liabilities 30,473    
Notional amount 30,618    
Marketable debt securities | Debt securities issued | 1 to 3 years      
Marketable debt securities      
Financial liabilities 72,949    
Notional amount 73,131    
Marketable debt securities | Debt securities issued | 3 to 5 years      
Marketable debt securities      
Financial liabilities 46,222    
Notional amount 46,367    
Marketable debt securities | Debt securities issued | More than 5 years      
Marketable debt securities      
Financial liabilities 64,254    
Notional amount 64,318    
Marketable debt securities | Subordinated debt      
Marketable debt securities      
Financial liabilities 25,938 21,686 20,878
Notional amount 25,774    
Marketable debt securities | Subordinated debt | On demand      
Marketable debt securities      
Financial liabilities 0    
Notional amount 0    
Marketable debt securities | Subordinated debt | Within 1 month      
Marketable debt securities      
Financial liabilities 0    
Notional amount 0    
Marketable debt securities | Subordinated debt | 1 to 3 months      
Marketable debt securities      
Financial liabilities 49    
Notional amount 49    
Marketable debt securities | Subordinated debt | 3 to 12 months      
Marketable debt securities      
Financial liabilities 130    
Notional amount 129    
Marketable debt securities | Subordinated debt | 1 to 3 years      
Marketable debt securities      
Financial liabilities 656    
Notional amount 652    
Marketable debt securities | Subordinated debt | 3 to 5 years      
Marketable debt securities      
Financial liabilities 6,167    
Notional amount 6,128    
Marketable debt securities | Subordinated debt | More than 5 years      
Marketable debt securities      
Financial liabilities 18,936    
Notional amount 18,816    
Marketable debt securities | Senior unsecured debt      
Marketable debt securities      
Financial liabilities 111,434    
Notional amount 112,525    
Marketable debt securities | Senior unsecured debt | On demand      
Marketable debt securities      
Financial liabilities 0    
Notional amount 0    
Marketable debt securities | Senior unsecured debt | Within 1 month      
Marketable debt securities      
Financial liabilities 3,033    
Notional amount 3,063    
Marketable debt securities | Senior unsecured debt | 1 to 3 months      
Marketable debt securities      
Financial liabilities 3,734    
Notional amount 3,771    
Marketable debt securities | Senior unsecured debt | 3 to 12 months      
Marketable debt securities      
Financial liabilities 10,621    
Notional amount 10,725    
Marketable debt securities | Senior unsecured debt | 1 to 3 years      
Marketable debt securities      
Financial liabilities 38,731    
Notional amount 39,110    
Marketable debt securities | Senior unsecured debt | 3 to 5 years      
Marketable debt securities      
Financial liabilities 26,715    
Notional amount 26,976    
Marketable debt securities | Senior unsecured debt | More than 5 years      
Marketable debt securities      
Financial liabilities 28,600    
Notional amount 28,880    
Marketable debt securities | Senior secured debt      
Marketable debt securities      
Financial liabilities 82,928    
Notional amount 82,451    
Marketable debt securities | Senior secured debt | On demand      
Marketable debt securities      
Financial liabilities 0    
Notional amount 0    
Marketable debt securities | Senior secured debt | Within 1 month      
Marketable debt securities      
Financial liabilities 1,673    
Notional amount 1,663    
Marketable debt securities | Senior secured debt | 1 to 3 months      
Marketable debt securities      
Financial liabilities 5,271    
Notional amount 5,241    
Marketable debt securities | Senior secured debt | 3 to 12 months      
Marketable debt securities      
Financial liabilities 12,364    
Notional amount 12,293    
Marketable debt securities | Senior secured debt | 1 to 3 years      
Marketable debt securities      
Financial liabilities 33,562    
Notional amount 33,369    
Marketable debt securities | Senior secured debt | 3 to 5 years      
Marketable debt securities      
Financial liabilities 13,340    
Notional amount 13,263    
Marketable debt securities | Senior secured debt | More than 5 years      
Marketable debt securities      
Financial liabilities 16,718    
Notional amount 16,622    
Marketable debt securities | Promissory notes and other securities      
Marketable debt securities      
Financial liabilities 25,863 € 22,006 € 32,644
Notional amount 26,259    
Marketable debt securities | Promissory notes and other securities | On demand      
Marketable debt securities      
Financial liabilities 0    
Notional amount 0    
Marketable debt securities | Promissory notes and other securities | Within 1 month      
Marketable debt securities      
Financial liabilities 9,201    
Notional amount 9,341    
Marketable debt securities | Promissory notes and other securities | 1 to 3 months      
Marketable debt securities      
Financial liabilities 9,304    
Notional amount 9,447    
Marketable debt securities | Promissory notes and other securities | 3 to 12 months      
Marketable debt securities      
Financial liabilities 7,358    
Notional amount 7,471    
Marketable debt securities | Promissory notes and other securities | 1 to 3 years      
Marketable debt securities      
Financial liabilities 0    
Notional amount 0    
Marketable debt securities | Promissory notes and other securities | 3 to 5 years      
Marketable debt securities      
Financial liabilities 0    
Notional amount 0    
Marketable debt securities | Promissory notes and other securities | More than 5 years      
Marketable debt securities      
Financial liabilities 0    
Notional amount € 0