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Financial Risks - Summary of Composition by Credit Quality of Debt Securities, Available-for-Sale, in an Unrealized Loss Position (Detail) - EUR (€)
€ in Millions
Dec. 31, 2019
Dec. 31, 2018
Disclosure of available for sale debt securities [line items]    
Carrying value of securities with unrealized losses € 4,407 € 24,080
Unrealized losses (210) (1,264)
AAA [member]    
Disclosure of available for sale debt securities [line items]    
Carrying value of securities with unrealized losses 1,340 6,318
Unrealized losses (10) (186)
AA [member]    
Disclosure of available for sale debt securities [line items]    
Carrying value of securities with unrealized losses 452 1,468
Unrealized losses (8) (48)
A [member]    
Disclosure of available for sale debt securities [line items]    
Carrying value of securities with unrealized losses 662 5,345
Unrealized losses (13) (181)
BBB [member]    
Disclosure of available for sale debt securities [line items]    
Carrying value of securities with unrealized losses 1,345 8,881
Unrealized losses (58) (578)
BB [member]    
Disclosure of available for sale debt securities [line items]    
Carrying value of securities with unrealized losses 181 920
Unrealized losses (17) (90)
B [member]    
Disclosure of available for sale debt securities [line items]    
Carrying value of securities with unrealized losses 186 742
Unrealized losses (25) (87)
Below B [member]    
Disclosure of available for sale debt securities [line items]    
Carrying value of securities with unrealized losses 240 407
Unrealized losses € (78) € (95)