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Capital Management and Solvency - Summary of Composition of Available Own Funds Across Tiers (Detail) - New method [member] - Solvency one capital ratio [member] - EUR (€) € in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Disclosure of capital management and solvency [line items] |  |
Total available own funds | € 18,470 | € 17,602
Unrestricted tier 1 [member] |  |
Disclosure of capital management and solvency [line items] |  |
Total available own funds | 12,724 | 12,204
Restricted tier 1 [member] |  |
Disclosure of capital management and solvency [line items] |  |
Total available own funds | 2,614 | 3,406
Tier 2 capital [member] |  |
Disclosure of capital management and solvency [line items] |  |
Total available own funds | 2,370 | 1,487
Tier 3 capital [member] |  |
Disclosure of capital management and solvency [line items] |  |
Total available own funds | € 762 | € 505

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