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Financial Risks - Summary of Group Limits Per Credit Rating (Detail) - EUR (€) € in Millions | Dec. 31, 2019 | Dec. 31, 2018
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AAA [member] |  |
Disclosure of group limits per credit rating [line items] |  |
Group limits per credit rating | € 900 | € 900
AA [member] |  |
Disclosure of group limits per credit rating [line items] |  |
Group limits per credit rating | 900 | 900
A [member] |  |
Disclosure of group limits per credit rating [line items] |  |
Group limits per credit rating | 675 | 675
BBB [member] |  |
Disclosure of group limits per credit rating [line items] |  |
Group limits per credit rating | 450 | 450
BB [member] |  |
Disclosure of group limits per credit rating [line items] |  |
Group limits per credit rating | 250 | 250
B [member] |  |
Disclosure of group limits per credit rating [line items] |  |
Group limits per credit rating | 125 | 125
CCC or lower [member] |  |
Disclosure of group limits per credit rating [line items] |  |
Group limits per credit rating | € 50 | € 50

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- Details
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