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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
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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)

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