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Deferred Tax - Schedule of Net Deferred Tax Assets and Liabilities has been Recognized (Detail) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Deferred tax assets and liabilities [Line Items]      
Beginning balance € 394 € 942  
Acquisitions / Additions   9  
Charged to income statement 114 22 € (201)
Charged to OCI 520 (494)  
Net exchange differences (2) 25  
Disposal of a business 2    
Other 7 (101)  
Ending balance 1,035 394 942
Real estate [member]      
Deferred tax assets and liabilities [Line Items]      
Beginning balance 519 554  
Charged to income statement 125 (31)  
Charged to OCI (8) (7)  
Net exchange differences 1 4  
Other 7    
Ending balance 644 519 554
Financial assets [member]      
Deferred tax assets and liabilities [Line Items]      
Beginning balance 814 1,737  
Charged to income statement 25 (451)  
Charged to OCI 628 (514)  
Net exchange differences 9 46  
Transfer to/from other headings   (3)  
Other (3)    
Ending balance 1,473 814 1,737
Insurance and investment contracts [member]      
Deferred tax assets and liabilities [Line Items]      
Beginning balance (1,434) (1,787)  
Charged to income statement (20) 401  
Charged to OCI   2  
Net exchange differences (17) (51)  
Ending balance (1,471) (1,434) (1,787)
Deferred expenses, VOBA and other intangible assets [member]      
Deferred tax assets and liabilities [Line Items]      
Beginning balance 1,914 1,892  
Acquisitions / Additions   9  
Charged to income statement (176) (63)  
Net exchange differences 37 82  
Transfer to/from other headings   (6)  
Ending balance 1,775 1,914 1,892
Defined benefit plans [member]      
Deferred tax assets and liabilities [Line Items]      
Beginning balance (269) (295)  
Charged to income statement 108 23  
Charged to OCI (90) 17  
Net exchange differences (5) (14)  
Ending balance (256) (269) (295)
Losses [member]      
Deferred tax assets and liabilities [Line Items]      
Beginning balance (314) (296)  
Charged to income statement 63 (1)  
Charged to OCI   (2)  
Net exchange differences (9) (4)  
Transfer to/from other headings (473)    
Other   (11)  
Ending balance (734) (314) (296)
Other [member]      
Deferred tax assets and liabilities [Line Items]      
Beginning balance (827) (863)  
Charged to income statement (11) 143  
Charged to OCI (9) 12  
Net exchange differences (17) (38)  
Disposal of a business 2    
Transfer to/from other headings 473 9  
Other 3 (90)  
Ending balance € (398) € (827) € (863)