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Financial Risks - Schedule of Credit Risk Concentration - Credit Rating (Detail) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
AAA [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations credit rating € 29,248 € 29,511
AA [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations credit rating 9,848 9,934
A [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations credit rating 24,693 20,587
BBB [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations credit rating 23,371 21,670
BB [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations credit rating 1,524 1,638
B [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations credit rating 1,280 1,207
CCC or lower [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations credit rating 1,524 1,621
Assets not rated [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations credit rating 691 1,391
A credit rating [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations credit rating 92,180 87,560
Government bonds [member] | AAA [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations credit rating 20,324 20,479
Government bonds [member] | AA [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations credit rating 4,903 4,949
Government bonds [member] | A [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations credit rating 899 614
Government bonds [member] | BBB [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations credit rating 949 961
Government bonds [member] | BB [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations credit rating 110 215
Government bonds [member] | B [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations credit rating 297 136
Government bonds [member] | CCC or lower [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations credit rating 18 1
Government bonds [member] | A credit rating [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations credit rating 27,500 27,356
Corporate bonds [member] | AAA [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations credit rating 719 772
Corporate bonds [member] | AA [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations credit rating 3,514 3,264
Corporate bonds [member] | A [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations credit rating 22,416 18,482
Corporate bonds [member] | BBB [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations credit rating 22,137 20,360
Corporate bonds [member] | BB [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations credit rating 1,292 1,279
Corporate bonds [member] | B [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations credit rating 956 1,003
Corporate bonds [member] | CCC or lower [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations credit rating 309 302
Corporate bonds [member] | Assets not rated [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations credit rating 3  
Corporate bonds [member] | A credit rating [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations credit rating 51,347 45,462
RMBs CMBSs ABSs [member] | AAA [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations credit rating 6,344 6,505
RMBs CMBSs ABSs [member] | AA [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations credit rating 1,429 1,721
RMBs CMBSs ABSs [member] | A [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations credit rating 1,378 1,490
RMBs CMBSs ABSs [member] | BBB [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations credit rating 284 349
RMBs CMBSs ABSs [member] | BB [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations credit rating 122 144
RMBs CMBSs ABSs [member] | B [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations credit rating 27 69
RMBs CMBSs ABSs [member] | CCC or lower [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations credit rating 1,197 1,318
RMBs CMBSs ABSs [member] | Assets not rated [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations credit rating 3  
RMBs CMBSs ABSs [member] | A credit rating [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations credit rating 10,783 11,596
Other credit grades [member] | AAA [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations credit rating 1,861 1,753
Other credit grades [member] | AA [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations credit rating 2  
Other credit grades [member] | A [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations credit rating   1
Other credit grades [member] | BBB [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations credit rating   1
Other credit grades [member] | Assets not rated [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations credit rating 686 1,391
Other credit grades [member] | A credit rating [member]    
Disclosure of credit risk exposure [line items]    
Credit risk concentrations credit rating € 2,549 € 3,147