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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
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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)

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