XML 190 R342.htm IDEA: XBRL DOCUMENT v3.20.1
Fair Value - Schedule of Transfers between Level 1 and Level II for Financial Assets and Liabilities Recorded at Fair Value on Recurring Basis (Detail) - Recurring fair value measurement [member] - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of transfers between level 1 and level 2 for financial assets and liabilities recorded at fair value [line items]    
Transfers Level I to Level II € 20 € 3
Transfers Level II to Level I 19 (3)
Available-for-sale financial assets [member]    
Disclosure of transfers between level 1 and level 2 for financial assets and liabilities recorded at fair value [line items]    
Transfers Level I to Level II 12  
Transfers Level II to Level I 3  
Available-for-sale financial assets [member] | Debt securities [member]    
Disclosure of transfers between level 1 and level 2 for financial assets and liabilities recorded at fair value [line items]    
Transfers Level I to Level II 12  
Transfers Level II to Level I 3  
Financial assets at fair value through profit or loss, mandatorily measured at fair value, category [member]    
Disclosure of transfers between level 1 and level 2 for financial assets and liabilities recorded at fair value [line items]    
Transfers Level I to Level II 8 3
Transfers Level II to Level I 16 (3)
Financial assets at fair value through profit or loss, mandatorily measured at fair value, category [member] | Shares [member]    
Disclosure of transfers between level 1 and level 2 for financial assets and liabilities recorded at fair value [line items]    
Transfers Level I to Level II 8 3
Transfers Level II to Level I 8 1
Financial assets at fair value through profit or loss, mandatorily measured at fair value, category [member] | Investment contracts for account of policyholders [member]    
Disclosure of transfers between level 1 and level 2 for financial assets and liabilities recorded at fair value [line items]    
Transfers Level II to Level I € 8 € (4)