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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
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