XML 297 R152.htm IDEA: XBRL DOCUMENT v3.20.1
Financial Risks - Summary of Composition by Maturity of all Available-for-Sale Debt Securities 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 gross unrealized losses € 4,407 € 24,080
Gross unrealized losses (210) (1,264)
Not later than 1 year [member]    
Disclosure of available for sale debt securities [line items]    
Carrying value of securities with gross unrealized losses 247 643
Gross unrealized losses (1) (18)
1-5 years [member]    
Disclosure of available for sale debt securities [line items]    
Carrying value of securities with gross unrealized losses 983 5,545
Gross unrealized losses (26) (120)
Over 5 through 10 years [member]    
Disclosure of available for sale debt securities [line items]    
Carrying value of securities with gross unrealized losses 1,175 9,575
Gross unrealized losses (47) (446)
Over 10 years [member]    
Disclosure of available for sale debt securities [line items]    
Carrying value of securities with gross unrealized losses 2,002 8,317
Gross unrealized losses € (135) € (680)