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Financial Risks - Disclosure of Foreign Exchange Rates (Detail) - Carrying value [member] - EUR (€)
€ in Millions
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about credit rating [line items]    
Rated credit exposures € 20,835 € 20,505
AA [member]    
Disclosure of detailed information about credit rating [line items]    
Rated credit exposures 10,477 9,150
A [member]    
Disclosure of detailed information about credit rating [line items]    
Rated credit exposures 10,002 11,041
Below A [member]    
Disclosure of detailed information about credit rating [line items]    
Rated credit exposures 40 30
Not rated [member]    
Disclosure of detailed information about credit rating [line items]    
Rated credit exposures € 316 € 284