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Segment Information - Additional Information (Detail)
€ in Millions
 6 Months Ended 12 Months Ended
Dec. 31, 2019
EUR (€)
Dec. 31, 2019
EUR (€)
Segment
Dec. 31, 2018
EUR (€)
Dec. 31, 2017
EUR (€)
Disclosure of operating segments [line items]        
Impact of net income due to measurement assumption   € 0    
Other income /(charges) expense due to model and assumption updates   (196) € (121)  
Losses on change in fair value on economic hedges   1,130 (545) € (1,159)
Ineffectiveness fair value hedge   1 7 2
Impairment charges and reversals on financial assets, excluding receivables   60 41 42
Impairment charges and reversals on non-financial assets and receivables   109 36  
Commissions and expenses [member]        
Disclosure of operating segments [line items]        
Restructuring charges   220 279 116
Amortization of deferred expenses     67 285
Amortization of VOBA and future servicing rights   5 20 94
Commissions and expense include a DPAC/VOBA fair value adjustment   151 (88) 135
Impairment (charges) reversals [member]        
Disclosure of operating segments [line items]        
Amortization of deferred expenses   32    
Impairment charges and reversals on financial assets, excluding receivables   60 41 42
Impairment charges and reversals on non-financial assets and receivables   € 109 19 (1)
Americas Expenses [Member]        
Disclosure of operating segments [line items]        
Other income /(charges) expense due to model and assumption updates € (75)      
Bottom of range [member]        
Disclosure of operating segments [line items]        
Long-term expected return on assets rate   3.00%    
Top of range [member]        
Disclosure of operating segments [line items]        
Long-term expected return on assets rate   10.00%    
Non-cash changes [member]        
Disclosure of operating segments [line items]        
Gain (losses) on over- or underperformance of derivatives   € 34 3 9
Losses on change in fair value on economic hedges   130 (77) (145)
Ineffectiveness fair value hedge   € 1 7 € 2
Asset management [member]        
Disclosure of operating segments [line items]        
Number of operating segments | Segment   1    
Holding and other activities [member]        
Disclosure of operating segments [line items]        
Number of operating segments | Segment   1    
Americas [member]        
Disclosure of operating segments [line items]        
Number of operating segments | Segment   1    
Other income /(charges) expense due to model and assumption updates   € (64) (6)  
Americas [member] | Americas Life mortality [member]        
Disclosure of operating segments [line items]        
Other income /(charges) expense due to model and assumption updates     (164)  
Americas [member] | New expense allocation methodology [member]        
Disclosure of operating segments [line items]        
Other income /(charges) expense due to model and assumption updates     (158)  
Asia [member]        
Disclosure of operating segments [line items]        
Number of operating segments | Segment   1    
The Netherlands [member]        
Disclosure of operating segments [line items]        
Other income /(charges) expense due to model and assumption updates   € (57) (111)  
The Netherlands [member] | Population mortality [member]        
Disclosure of operating segments [line items]        
Other income /(charges) expense due to model and assumption updates     (219)  
The Netherlands [member] | TKP UL Model [member]        
Disclosure of operating segments [line items]        
Other income /(charges) expense due to model and assumption updates     € (108)  
The Netherlands [member] | Bottom of range [member] | Population mortality [member]        
Disclosure of operating segments [line items]        
Lowering of IFRS ultimate forward rate     3.65%  
The Netherlands [member] | Top of range [member] | Population mortality [member]        
Disclosure of operating segments [line items]        
Lowering of IFRS ultimate forward rate     4.25%