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Insurance Contracts - Summary of Sensitivity Analysis of Net Result and Shareholders' Equity to Changes in Various Underwriting Risks (Detail) - EUR (€)
€ in Millions
Dec. 31, 2021
Dec. 31, 2020
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 € 70 € (151)
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 (67) 47
On Share Holders Equity Insurance Contracts [member] | Five Percentage Increase In Mortality Rates [member]    
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]    
Sensitivity analysis of shareholders' equity (83) 52
On Share Holders Equity Insurance Contracts [member] | Five Percentage Decrease In Mortality Rates [member]    
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]    
Sensitivity analysis of shareholders' equity 33 (217)
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 (213) (225)
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 99 134
Insurance [member] | Twenty Percentage Increase In Lapse Rates [member]    
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]    
Sensitivity analysis of net result 71 156
Insurance [member] | Twenty Percentage Decrease In Lapse Rates [member]    
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]    
Sensitivity analysis of net result (72) (157)
Insurance [member] | Five Percentage Increase In Mortality Rates [member]    
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]    
Sensitivity analysis of net result (90) 344
Insurance [member] | Five Percentage Decrease In Mortality Rates [member]    
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]    
Sensitivity analysis of net result 48 (354)
Insurance [member] | Ten Percentage Increase In Morbidity Rates [member]    
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]    
Sensitivity analysis of net result (205) (235)
Insurance [member] | Ten Percentage Decrease In Morbidity Rates [member]    
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]    
Sensitivity analysis of net result € 96 € 140