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Significant Accounting Policies - Summary of Credit Risk Exposure (Detail) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Financial assets at carrying value, class [member]    
Disclosure of financial assets [line items]    
Financial assets with no low credit risk € 35,056 € 34,087
Financial assets at carrying value, class [member] | Shares - Carried at fair value [member]    
Disclosure of financial assets [line items]    
Financial assets with no low credit risk 27 26
Financial assets at carrying value, class [member] | Debt securities - carried at fair value [member]    
Disclosure of financial assets [line items]    
Financial assets with no low credit risk 3,894 4,035
Financial assets at carrying value, class [member] | Mortgage loans - carried at amortized cost [member]    
Disclosure of financial assets [line items]    
Financial assets with no low credit risk 29,593 28,661
Financial assets at carrying value, class [member] | Private loans - held at amortized cost [member]    
Disclosure of financial assets [line items]    
Financial assets with no low credit risk 1,431 1,189
Financial assets at carrying value, class [member] | Deposits with financial institutions [member]    
Disclosure of financial assets [line items]    
Financial assets with no low credit risk 76 70
Financial assets at carrying value, class [member] | Other financial assets - carried at fair value [member]    
Disclosure of financial assets [line items]    
Financial assets with no low credit risk 35 106
Financial assets at fair value, class [member]    
Disclosure of financial assets [line items]    
Financial assets with no low credit risk 38,652 37,173
Financial assets at fair value, class [member] | Shares - Carried at fair value [member]    
Disclosure of financial assets [line items]    
Financial assets with no low credit risk 27 26
Financial assets at fair value, class [member] | Debt securities - carried at fair value [member]    
Disclosure of financial assets [line items]    
Financial assets with no low credit risk 3,894 4,035
Financial assets at fair value, class [member] | Mortgage loans - carried at amortized cost [member]    
Disclosure of financial assets [line items]    
Financial assets with no low credit risk 33,132 31,711
Financial assets at fair value, class [member] | Private loans - held at amortized cost [member]    
Disclosure of financial assets [line items]    
Financial assets with no low credit risk 1,488 1,225
Financial assets at fair value, class [member] | Deposits with financial institutions [member]    
Disclosure of financial assets [line items]    
Financial assets with no low credit risk 76 70
Financial assets at fair value, class [member] | Other financial assets - carried at fair value [member]    
Disclosure of financial assets [line items]    
Financial assets with no low credit risk € 35 € 106