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Significant Accounting Policies - Summary of Change in Fair Value (Detail) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of financial assets [line items]    
Fair value at the end of the reporting period € 148,570 € 139,834
Change in fair value during the reporting period 6,598 (4,525)
Solely payments of principal and interest [member] | Share [member]    
Disclosure of financial assets [line items]    
Fair value at the end of the reporting period 70 68
Change in fair value during the reporting period 1 (2)
Solely payments of principal and interest [member] | Debt securities [member]    
Disclosure of financial assets [line items]    
Fair value at the end of the reporting period 82,014 76,283
Change in fair value during the reporting period 6,218 (2,997)
Solely payments of principal and interest [member] | Money Markets and other short-term investment [member]    
Disclosure of financial assets [line items]    
Fair value at the end of the reporting period 2,724 3,126
Solely payments of principal and interest [member] | Mortgage loans - carried at amortized cost [member]    
Disclosure of financial assets [line items]    
Fair value at the end of the reporting period 42,567 39,758
Change in fair value during the reporting period 930 (1,213)
Solely payments of principal and interest [member] | Private loans - held at amortized cost [member]    
Disclosure of financial assets [line items]    
Fair value at the end of the reporting period 5,152 4,452
Change in fair value during the reporting period 284 (63)
Solely payments of principal and interest [member] | Deposits with financial institutions [member]    
Disclosure of financial assets [line items]    
Fair value at the end of the reporting period 142 141
Solely payments of principal and interest [member] | Other financial asset [member]    
Disclosure of financial assets [line items]    
Fair value at the end of the reporting period 36 111
Financial assets other than SPPI [member] | Share [member]    
Disclosure of financial assets [line items]    
Fair value at the end of the reporting period 810 2,092
Change in fair value during the reporting period 54 87
Financial assets other than SPPI [member] | Debt securities [member]    
Disclosure of financial assets [line items]    
Fair value at the end of the reporting period 4,839 4,970
Change in fair value during the reporting period (770) (123)
Financial assets other than SPPI [member] | Money Markets and other short-term investment [member]    
Disclosure of financial assets [line items]    
Fair value at the end of the reporting period 2,603 3,181
Financial assets other than SPPI [member] | Private loans - held at amortized cost [member]    
Disclosure of financial assets [line items]    
Fair value at the end of the reporting period 200 42
Change in fair value during the reporting period (18) (5)
Financial assets other than SPPI [member] | Policy loans [member]    
Disclosure of financial assets [line items]    
Fair value at the end of the reporting period 2,024 1,973
Financial assets other than SPPI [member] | Other financial asset [member]    
Disclosure of financial assets [line items]    
Fair value at the end of the reporting period 5,388 3,637
Change in fair value during the reporting period € (100) € (210)