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Financial Risks - Summary of Length of Time an Available-for-Sale Security (Detail) - EUR (€) € in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Disclosure of available for sale securities [line items] |  |
Debt securities investment grade unrealized loss | € (121) | € (272)
Investment grade [member] |  |
Disclosure of available for sale securities [line items] |  |
Debt securities investment grade unrealized loss | (89) | (992)
Investment grade [member] | 0 - 6 months [member] |  |
Disclosure of available for sale securities [line items] |  |
Debt securities investment grade unrealized loss | (35) | (227)
Investment grade [member] | 6 - 12 months [member] |  |
Disclosure of available for sale securities [line items] |  |
Debt securities investment grade unrealized loss | (2) | (504)
Investment grade [member] | > 12 months [member] |  |
Disclosure of available for sale securities [line items] |  |
Debt securities investment grade unrealized loss | (52) | (261)
Below investment grade [member] |  |
Disclosure of available for sale securities [line items] |  |
Debt securities investment grade unrealized loss | (121) | (272)
Below investment grade [member] | 0 - 6 months [member] |  |
Disclosure of available for sale securities [line items] |  |
Debt securities investment grade unrealized loss | (7) | (58)
Below investment grade [member] | 6 - 12 months [member] |  |
Disclosure of available for sale securities [line items] |  |
Debt securities investment grade unrealized loss | (4) | (96)
Below investment grade [member] | > 12 months [member] |  |
Disclosure of available for sale securities [line items] |  |
Debt securities investment grade unrealized loss | (110) | (119)
Carrying value [member] |  |
Disclosure of available for sale securities [line items] |  |
Debt securities investment grade unrealized loss | 608 | 2,069
Carrying value [member] | Investment grade [member] |  |
Disclosure of available for sale securities [line items] |  |
Debt securities investment grade unrealized loss | 3,799 | 22,012
Carrying value [member] | Investment grade [member] | 0 - 6 months [member] |  |
Disclosure of available for sale securities [line items] |  |
Debt securities investment grade unrealized loss | 2,178 | 8,354
Carrying value [member] | Investment grade [member] | 6 - 12 months [member] |  |
Disclosure of available for sale securities [line items] |  |
Debt securities investment grade unrealized loss | 128 | 9,976
Carrying value [member] | Investment grade [member] | > 12 months [member] |  |
Disclosure of available for sale securities [line items] |  |
Debt securities investment grade unrealized loss | 1,493 | 3,681
Carrying value [member] | Below investment grade [member] |  |
Disclosure of available for sale securities [line items] |  |
Debt securities investment grade unrealized loss | 608 | 2,069
Carrying value [member] | Below investment grade [member] | 0 - 6 months [member] |  |
Disclosure of available for sale securities [line items] |  |
Debt securities investment grade unrealized loss | 132 | 977
Carrying value [member] | Below investment grade [member] | 6 - 12 months [member] |  |
Disclosure of available for sale securities [line items] |  |
Debt securities investment grade unrealized loss | 45 | 609
Carrying value [member] | Below investment grade [member] | > 12 months [member] |  |
Disclosure of available for sale securities [line items] |  |
Debt securities investment grade unrealized loss | € 432 | € 483

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