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Financial assets - Fair value of financial assets not at fair value (Details) - EUR (€)
€ in Millions
Jun. 30, 2020
Dec. 31, 2019
Carrying amount    
Disclosure of fair value measurement of assets [line items]    
Financial assets € 976,298 € 995,482
Not measured at fair value in statement of financial position but for which fair value is disclosed    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 987,836 1,005,554
Loans and advances | Carrying amount    
Disclosure of fair value measurement of assets [line items]    
Financial assets 949,131 965,693
Loans and advances | Not measured at fair value in statement of financial position but for which fair value is disclosed    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 960,074 975,523
Debt instruments asset | Carrying amount    
Disclosure of fair value measurement of assets [line items]    
Financial assets 27,167 29,789
Debt instruments asset | Not measured at fair value in statement of financial position but for which fair value is disclosed    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value € 27,762 € 30,031