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Financial Risks - Summary of Length of Time Security and Respective Realized Loss (Detail) - EUR (€) € in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Disclosure of available for sale securities [line items] |  |
Debt securities | € (66) | € (378)
Not later than 1 year [member] |  |
Disclosure of available for sale securities [line items] |  |
Debt securities | (32) | (145)
> 12 months [member] |  |
Disclosure of available for sale securities [line items] |  |
Debt securities | € (34) | € (233)

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- Details
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Period Type: |

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- Details
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Data Type: | na
Balance Type: |
Period Type: |