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Insurance Contracts - Summary of Sensitivity Analysis of Net Income and Shareholders' Equity to Changes in Various Underwriting Risks (Detail) - EUR (€) | Dec. 31, 2019 | Dec. 31, 2018
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On Share Holders Equity Insurance Contracts [member] | Twenty Percentage Increase In Lapse Rates [member] |  |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |
Sensitivity analysis of shareholders' equity | € 152 | € 94
On Share Holders Equity Insurance Contracts [member] | Twenty Percentage Decrease In Lapse Rates [member] |  |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |
Sensitivity analysis of shareholders' equity | (169) | (139)
On Share Holders Equity Insurance Contracts [member] | Ten Percentage Increase In Mortality Rates [member] |  |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |
Sensitivity analysis of shareholders' equity | 261 | 252
On Share Holders Equity Insurance Contracts [member] | Ten Percentage Decrease In Mortality Rates [member] |  |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |
Sensitivity analysis of shareholders' equity | (322) | (418)
On Share Holders Equity Insurance Contracts [member] | Ten Percentage Increase In Morbidity Rates [member] |  |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |
Sensitivity analysis of shareholders' equity | (370) | (525)
On Share Holders Equity Insurance Contracts [member] | Ten Percentage Decrease In Morbidity Rates [member] |  |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |
Sensitivity analysis of shareholders' equity | 191 | 183
Insurance [member] | Twenty Percentage Increase In Lapse Rates [member] |  |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |
Sensitivity analysis of net income | 143 | 109
Insurance [member] | Twenty Percentage Decrease In Lapse Rates [member] |  |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |
Sensitivity analysis of net income | (156) | (154)
Insurance [member] | Ten Percentage Increase In Mortality Rates [member] |  |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |
Sensitivity analysis of net income | 192 | 63
Insurance [member] | Ten Percentage Decrease In Mortality Rates [member] |  |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |
Sensitivity analysis of net income | (240) | (210)
Insurance [member] | Ten Percentage Increase In Morbidity Rates [member] |  |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |
Sensitivity analysis of net income | (376) | (446)
Insurance [member] | Ten Percentage Decrease In Morbidity Rates [member] |  |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |
Sensitivity analysis of net income | € 196 | € 125

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