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Financial Risks - Aging and Severity Unrealised Losses Debt Securities (Detail) - EUR (€) € in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Disclosure of available for sale securities [line items] |  |
Carrying value | € (121) | € (272)
0 - 6 months [member] |  |
Disclosure of available for sale securities [line items] |  |
Carrying value | (7) | (58)
0 - 6 months [member] | CV 70-100% of amortized cost [member] |  |
Disclosure of available for sale securities [line items] |  |
Carrying value | (6) | (53)
0 - 6 months [member] | CV 40-70% of amortized cost [member] |  |
Disclosure of available for sale securities [line items] |  |
Carrying value | (1) | (5)
6 - 12 months [member] |  |
Disclosure of available for sale securities [line items] |  |
Carrying value | (4) | (96)
6 - 12 months [member] | CV 70-100% of amortized cost [member] |  |
Disclosure of available for sale securities [line items] |  |
Carrying value | (3) | (76)
6 - 12 months [member] | CV 40-70% of amortized cost [member] |  |
Disclosure of available for sale securities [line items] |  |
Carrying value | (1) | (18)
6 - 12 months [member] | CV below 40% of amortized cost [member] |  |
Disclosure of available for sale securities [line items] |  |
Carrying value |  | (1)
12-24 months [member] |  |
Disclosure of available for sale securities [line items] |  |
Carrying value | (52) | (28)
12-24 months [member] | CV 70-100% of amortized cost [member] |  |
Disclosure of available for sale securities [line items] |  |
Carrying value | (21) | (21)
12-24 months [member] | CV 40-70% of amortized cost [member] |  |
Disclosure of available for sale securities [line items] |  |
Carrying value | (22) | (5)
12-24 months [member] | CV below 40% of amortized cost [member] |  |
Disclosure of available for sale securities [line items] |  |
Carrying value | (9) | (2)
> 24 months [member] |  |
Disclosure of available for sale securities [line items] |  |
Carrying value | (58) | (90)
> 24 months [member] | CV 70-100% of amortized cost [member] |  |
Disclosure of available for sale securities [line items] |  |
Carrying value | (24) | (34)
> 24 months [member] | CV 40-70% of amortized cost [member] |  |
Disclosure of available for sale securities [line items] |  |
Carrying value | (9) | (43)
> 24 months [member] | CV below 40% of amortized cost [member] |  |
Disclosure of available for sale securities [line items] |  |
Carrying value | (25) | (13)
Carrying value [member] |  |
Disclosure of available for sale securities [line items] |  |
Carrying value | 608 | 2,069
Carrying value [member] | 0 - 6 months [member] |  |
Disclosure of available for sale securities [line items] |  |
Carrying value | 132 | 977
Carrying value [member] | 0 - 6 months [member] | CV 70-100% of amortized cost [member] |  |
Disclosure of available for sale securities [line items] |  |
Carrying value | 131 | 970
Carrying value [member] | 0 - 6 months [member] | CV 40-70% of amortized cost [member] |  |
Disclosure of available for sale securities [line items] |  |
Carrying value | 1 | 7
Carrying value [member] | 6 - 12 months [member] |  |
Disclosure of available for sale securities [line items] |  |
Carrying value | 45 | 609
Carrying value [member] | 6 - 12 months [member] | CV 70-100% of amortized cost [member] |  |
Disclosure of available for sale securities [line items] |  |
Carrying value | 43 | 577
Carrying value [member] | 6 - 12 months [member] | CV 40-70% of amortized cost [member] |  |
Disclosure of available for sale securities [line items] |  |
Carrying value | 1 | 31
Carrying value [member] | 12-24 months [member] |  |
Disclosure of available for sale securities [line items] |  |
Carrying value | 213 | 151
Carrying value [member] | 12-24 months [member] | CV 70-100% of amortized cost [member] |  |
Disclosure of available for sale securities [line items] |  |
Carrying value | 175 | 143
Carrying value [member] | 12-24 months [member] | CV 40-70% of amortized cost [member] |  |
Disclosure of available for sale securities [line items] |  |
Carrying value | 33 | 8
Carrying value [member] | 12-24 months [member] | CV below 40% of amortized cost [member] |  |
Disclosure of available for sale securities [line items] |  |
Carrying value | 4 | 1
Carrying value [member] | > 24 months [member] |  |
Disclosure of available for sale securities [line items] |  |
Carrying value | 219 | 331
Carrying value [member] | > 24 months [member] | CV 70-100% of amortized cost [member] |  |
Disclosure of available for sale securities [line items] |  |
Carrying value | 192 | 265
Carrying value [member] | > 24 months [member] | CV 40-70% of amortized cost [member] |  |
Disclosure of available for sale securities [line items] |  |
Carrying value | 13 | 58
Carrying value [member] | > 24 months [member] | CV below 40% of amortized cost [member] |  |
Disclosure of available for sale securities [line items] |  |
Carrying value | € 14 | € 8

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