XML 412 R259.htm IDEA: XBRL DOCUMENT v3.20.1
Other Assets and Receivables - Additional Information (Detail) - EUR (€)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of other assets and receivables [Line Items]      
Carrying value under historical cost model € 489,000,000 € 498,000,000 € 530,000,000
Percentage of general account real estate held for own use 51.00% 57.00%  
Property, plant and equipment, pledged as security € 0    
Property, plant and equipment, restrictions on title 0    
Accrued income 1,442,000,000 € 1,421,000,000  
Historical cost model [member]      
Disclosure of other assets and receivables [Line Items]      
Carrying value under historical cost model € 231,000,000 € 301,000,000  
Independent external appraisers [member]      
Disclosure of other assets and receivables [Line Items]      
Percentage of appraisals for real estate held for own use 99.00% 99.00%  
Equipment 1 [member]      
Disclosure of other assets and receivables [Line Items]      
Carrying value under historical cost model € 281,000,000 € 235,000,000 € 223,000,000
Bottom of range [member] | Buildings [member]      
Disclosure of other assets and receivables [Line Items]      
Useful lives and depreciated period P40Y    
Bottom of range [member] | Equipment 1 [member]      
Disclosure of other assets and receivables [Line Items]      
Property, plant and equipment, pledged as security € 0    
Property, plant and equipment, restrictions on title € 0    
Useful lives and depreciated period P3Y    
Top of range [member] | Buildings [member]      
Disclosure of other assets and receivables [Line Items]      
Useful lives and depreciated period P50Y    
Top of range [member] | Equipment 1 [member]      
Disclosure of other assets and receivables [Line Items]      
Property, plant and equipment, pledged as security € 0    
Property, plant and equipment, restrictions on title € 0    
Useful lives and depreciated period P5Y