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Significant Accounting Policies - Summary of Credit Risk Rating Grades (Detail) - EUR (€)
€ in Millions
Dec. 31, 2019
Dec. 31, 2018
Disclosure of group limits per credit rating [line items]    
Financial assets at carrying value € 143,075 € 135,925
Financial assets at amortised cost, class [member]    
Disclosure of group limits per credit rating [line items]    
Financial assets at carrying value 127,988 120,436
Financial assets at amortised cost, class [member] | Shares - Carried at fair value [member]    
Disclosure of group limits per credit rating [line items]    
Financial assets at carrying value 70 68
Financial assets at amortised cost, class [member] | Debt securities - carried at fair value [member]    
Disclosure of group limits per credit rating [line items]    
Financial assets at carrying value 82,014 76,283
Financial assets at amortised cost, class [member] | Money market and other short-term investments - carried at fair value [member]    
Disclosure of group limits per credit rating [line items]    
Financial assets at carrying value 2,724 3,126
Financial assets at amortised cost, class [member] | Mortgage loans - carried at amortized cost [member]    
Disclosure of group limits per credit rating [line items]    
Financial assets at carrying value 38,524 36,639
Financial assets at amortised cost, class [member] | Private loans - held at amortized cost [member]    
Disclosure of group limits per credit rating [line items]    
Financial assets at carrying value 4,479 4,068
Financial assets at amortised cost, class [member] | Other financial assets - carried at fair value [member]    
Disclosure of group limits per credit rating [line items]    
Financial assets at carrying value 177 252
Financial assets at amortised cost, class [member] | AAA [member]    
Disclosure of group limits per credit rating [line items]    
Financial assets at carrying value 30,088 28,244
Financial assets at amortised cost, class [member] | AAA [member] | Debt securities - carried at fair value [member]    
Disclosure of group limits per credit rating [line items]    
Financial assets at carrying value 26,723 25,637
Financial assets at amortised cost, class [member] | AAA [member] | Money market and other short-term investments - carried at fair value [member]    
Disclosure of group limits per credit rating [line items]    
Financial assets at carrying value 255 55
Financial assets at amortised cost, class [member] | AAA [member] | Mortgage loans - carried at amortized cost [member]    
Disclosure of group limits per credit rating [line items]    
Financial assets at carrying value 1,311 941
Financial assets at amortised cost, class [member] | AAA [member] | Private loans - held at amortized cost [member]    
Disclosure of group limits per credit rating [line items]    
Financial assets at carrying value 1,799 1,611
Financial assets at amortised cost, class [member] | AA [member]    
Disclosure of group limits per credit rating [line items]    
Financial assets at carrying value 12,933 12,670
Financial assets at amortised cost, class [member] | AA [member] | Debt securities - carried at fair value [member]    
Disclosure of group limits per credit rating [line items]    
Financial assets at carrying value 8,989 9,224
Financial assets at amortised cost, class [member] | AA [member] | Money market and other short-term investments - carried at fair value [member]    
Disclosure of group limits per credit rating [line items]    
Financial assets at carrying value 193 158
Financial assets at amortised cost, class [member] | AA [member] | Mortgage loans - carried at amortized cost [member]    
Disclosure of group limits per credit rating [line items]    
Financial assets at carrying value 3,671 3,204
Financial assets at amortised cost, class [member] | AA [member] | Private loans - held at amortized cost [member]    
Disclosure of group limits per credit rating [line items]    
Financial assets at carrying value 82 83
Financial assets at amortised cost, class [member] | A [member]    
Disclosure of group limits per credit rating [line items]    
Financial assets at carrying value 26,111 23,510
Financial assets at amortised cost, class [member] | A [member] | Debt securities - carried at fair value [member]    
Disclosure of group limits per credit rating [line items]    
Financial assets at carrying value 20,112 17,057
Financial assets at amortised cost, class [member] | A [member] | Money market and other short-term investments - carried at fair value [member]    
Disclosure of group limits per credit rating [line items]    
Financial assets at carrying value 2,164 2,561
Financial assets at amortised cost, class [member] | A [member] | Mortgage loans - carried at amortized cost [member]    
Disclosure of group limits per credit rating [line items]    
Financial assets at carrying value 3,580 3,567
Financial assets at amortised cost, class [member] | A [member] | Private loans - held at amortized cost [member]    
Disclosure of group limits per credit rating [line items]    
Financial assets at carrying value 198 261
Financial assets at amortised cost, class [member] | A [member] | Other financial assets - carried at fair value [member]    
Disclosure of group limits per credit rating [line items]    
Financial assets at carrying value 57 64
Financial assets at amortised cost, class [member] | BBB [member]    
Disclosure of group limits per credit rating [line items]    
Financial assets at carrying value 23,800 21,925
Financial assets at amortised cost, class [member] | BBB [member] | Shares - Carried at fair value [member]    
Disclosure of group limits per credit rating [line items]    
Financial assets at carrying value 43 42
Financial assets at amortised cost, class [member] | BBB [member] | Debt securities - carried at fair value [member]    
Disclosure of group limits per credit rating [line items]    
Financial assets at carrying value 22,296 20,330
Financial assets at amortised cost, class [member] | BBB [member] | Money market and other short-term investments - carried at fair value [member]    
Disclosure of group limits per credit rating [line items]    
Financial assets at carrying value 112 351
Financial assets at amortised cost, class [member] | BBB [member] | Mortgage loans - carried at amortized cost [member]    
Disclosure of group limits per credit rating [line items]    
Financial assets at carrying value 369 266
Financial assets at amortised cost, class [member] | BBB [member] | Private loans - held at amortized cost [member]    
Disclosure of group limits per credit rating [line items]    
Financial assets at carrying value 970 924
Financial assets at amortised cost, class [member] | BBB [member] | Other financial assets - carried at fair value [member]    
Disclosure of group limits per credit rating [line items]    
Financial assets at carrying value 10 12
Financial assets at amortised cost, class [member] | BB [member]    
Disclosure of group limits per credit rating [line items]    
Financial assets at carrying value 1,487 1,601
Financial assets at amortised cost, class [member] | BB [member] | Shares - Carried at fair value [member]    
Disclosure of group limits per credit rating [line items]    
Financial assets at carrying value 27 9
Financial assets at amortised cost, class [member] | BB [member] | Debt securities - carried at fair value [member]    
Disclosure of group limits per credit rating [line items]    
Financial assets at carrying value 1,364 1,480
Financial assets at amortised cost, class [member] | BB [member] | Mortgage loans - carried at amortized cost [member]    
Disclosure of group limits per credit rating [line items]    
Financial assets at carrying value 15 15
Financial assets at amortised cost, class [member] | BB [member] | Private loans - held at amortized cost [member]    
Disclosure of group limits per credit rating [line items]    
Financial assets at carrying value 49 52
Financial assets at amortised cost, class [member] | BB [member] | Other financial assets - carried at fair value [member]    
Disclosure of group limits per credit rating [line items]    
Financial assets at carrying value 33 44
Financial assets at amortised cost, class [member] | B [member]    
Disclosure of group limits per credit rating [line items]    
Financial assets at carrying value 1,285 1,237
Financial assets at amortised cost, class [member] | B [member] | Shares - Carried at fair value [member]    
Disclosure of group limits per credit rating [line items]    
Financial assets at carrying value   17
Financial assets at amortised cost, class [member] | B [member] | Debt securities - carried at fair value [member]    
Disclosure of group limits per credit rating [line items]    
Financial assets at carrying value 1,244 1,159
Financial assets at amortised cost, class [member] | B [member] | Mortgage loans - carried at amortized cost [member]    
Disclosure of group limits per credit rating [line items]    
Financial assets at carrying value 4  
Financial assets at amortised cost, class [member] | B [member] | Other financial assets - carried at fair value [member]    
Disclosure of group limits per credit rating [line items]    
Financial assets at carrying value 38 61
Financial assets at amortised cost, class [member] | CCC or lower [member]    
Disclosure of group limits per credit rating [line items]    
Financial assets at carrying value 1,283 1,396
Financial assets at amortised cost, class [member] | CCC or lower [member] | Debt securities - carried at fair value [member]    
Disclosure of group limits per credit rating [line items]    
Financial assets at carrying value 1,283 1,395
Financial assets at amortised cost, class [member] | CCC or lower [member] | Other financial assets - carried at fair value [member]    
Disclosure of group limits per credit rating [line items]    
Financial assets at carrying value   1
Financial assets at amortised cost, class [member] | Grade Not Rated [member]    
Disclosure of group limits per credit rating [line items]    
Financial assets at carrying value 31,000 29,853
Financial assets at amortised cost, class [member] | Grade Not Rated [member] | Debt securities - carried at fair value [member]    
Disclosure of group limits per credit rating [line items]    
Financial assets at carrying value 3  
Financial assets at amortised cost, class [member] | Grade Not Rated [member] | Mortgage loans - carried at amortized cost [member]    
Disclosure of group limits per credit rating [line items]    
Financial assets at carrying value 29,574 28,647
Financial assets at amortised cost, class [member] | Grade Not Rated [member] | Private loans - held at amortized cost [member]    
Disclosure of group limits per credit rating [line items]    
Financial assets at carrying value 1,383 1,136
Financial assets at amortised cost, class [member] | Grade Not Rated [member] | Other financial assets - carried at fair value [member]    
Disclosure of group limits per credit rating [line items]    
Financial assets at carrying value € 40 € 70