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Financial Risks - Summary Of Maturity Analysis For Derivative Financial Instruments (Detail) - EUR (€)
€ in Millions
Dec. 31, 2019
Dec. 31, 2018
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Cash inflows € 14,292 € 4,078
Cash outflows (14,126) (6,614)
Carrying value [member]    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Cash inflows 36,357 64,101
Cash outflows (33,619) (62,141)
Not later than 1 year [member]    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Cash inflows 865 156
Cash outflows (983) (66)
Not later than 1 year [member] | Carrying value [member]    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Cash inflows 17,162 23,453
Cash outflows (17,056) (23,143)
1-5 years [member]    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Cash inflows 3,091 709
Cash outflows (2,594) (288)
1-5 years [member] | Carrying value [member]    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Cash inflows 3,098 8,092
Cash outflows (2,922) (7,351)
Over 5 through 10 years [member]    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Cash inflows 3,537 982
Cash outflows (2,832) (516)
Over 5 through 10 years [member] | Carrying value [member]    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Cash inflows 4,470 11,323
Cash outflows (3,570) (10,832)
Over 10 years [member]    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Cash inflows 6,798 2,230
Cash outflows (7,716) (5,743)
Over 10 years [member] | Carrying value [member]    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Cash inflows 11,628 21,233
Cash outflows € (10,071) € (20,816)