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Other Income - Additional Information (Detail) € in Millions, £ in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2019 EUR (€) | Dec. 31, 2018 EUR (€) | Dec. 31, 2017 EUR (€) | Dec. 31, 2017 USD ($) | Dec. 31, 2017 GBP (£)
Disclosure of other operating income [line items] |  |  |  |  |
Other income | € 200 | € 8 | € 540 |  |
Release of expense reserves |  |  | 82 |  | £ 71
Business disposal gain loss | 70 |  |  |  |
Payout annuity business and Bank Owned Life Insurance / Corporate Owned Life Insurance business [member] |  |  |  |  |
Disclosure of other operating income [line items] |  |  |  |  |
Other income |  |  | 231 | $ 250 |
Impact of Pension plan Amendment | € 101 |  |  |  |
Unirobe Meeus Groep B.V. [member] |  |  |  |  |
Disclosure of other operating income [line items] |  |  |  |  |
Other income |  |  | 208 |  |
Legal & General [member] |  |  |  |  |
Disclosure of other operating income [line items] |  |  |  |  |
Other income |  |  | € 17 |  | £ 14

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