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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

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