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Financial Risks - Schedule of Ratings Distribution of General Account Portfolios (Detail) - EUR (€) € in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Disclosure of detailed information about credit rating [line items] |  |
Fair value | € 148,570 | € 139,834
Total | 143,075 | 135,925
Credit rating general account investments, excluding reinsurance assets [member] |  |
Disclosure of detailed information about credit rating [line items] |  |
Amortized cost | 44,591 | 42,653
Fair value | 109,142 | 100,609
Total | 153,732 | 143,263
Credit rating general account investments, excluding reinsurance assets [member] | AAA [member] |  |
Disclosure of detailed information about credit rating [line items] |  |
Amortized cost | 3,110 | 2,552
Fair value | 29,322 | 29,518
Total | 32,431 | 32,070
Credit rating general account investments, excluding reinsurance assets [member] | AA [member] |  |
Disclosure of detailed information about credit rating [line items] |  |
Amortized cost | 3,752 | 3,188
Fair value | 13,014 | 11,626
Total | 16,766 | 14,813
Credit rating general account investments, excluding reinsurance assets [member] | A [member] |  |
Disclosure of detailed information about credit rating [line items] |  |
Amortized cost | 3,688 | 3,675
Fair value | 31,206 | 22,542
Total | 34,895 | 26,218
Credit rating general account investments, excluding reinsurance assets [member] | BBB [member] |  |
Disclosure of detailed information about credit rating [line items] |  |
Amortized cost | 1,249 | 1,193
Fair value | 24,058 | 21,871
Total | 25,307 | 23,064
Credit rating general account investments, excluding reinsurance assets [member] | BB [member] |  |
Disclosure of detailed information about credit rating [line items] |  |
Amortized cost | 64 | 68
Fair value | 1,678 | 1,653
Total | 1,742 | 1,721
Credit rating general account investments, excluding reinsurance assets [member] | B [member] |  |
Disclosure of detailed information about credit rating [line items] |  |
Amortized cost | 40 | 64
Fair value | 1,274 | 1,267
Total | 1,314 | 1,331
Credit rating general account investments, excluding reinsurance assets [member] | CCC or lower [member] |  |
Disclosure of detailed information about credit rating [line items] |  |
Amortized cost |  | 1
Fair value | 699 | 773
Total | 699 | 774
Credit rating general account investments, excluding reinsurance assets [member] | Assets not rated [member] |  |
Disclosure of detailed information about credit rating [line items] |  |
Amortized cost | 32,383 | 31,527
Fair value | 6,789 | 9,960
Total | 39,172 | 41,488
Credit rating general account investments, excluding reinsurance assets [member] | Credit rating general account investments [member] |  |
Disclosure of detailed information about credit rating [line items] |  |
Amortized cost | 44,286 | 42,268
Fair value | 108,040 | 99,210
Total | 152,327 | 141,478
Credit rating general account investments, excluding reinsurance assets [member] | Financial assets past due and or impaired assets [member] |  |
Disclosure of detailed information about credit rating [line items] |  |
Amortized cost | 305 | 385
Fair value | 1,101 | 1,399
Total | 1,406 | 1,784
Credit rating general account investments, excluding reinsurance assets [member] | Asia [member] |  |
Disclosure of detailed information about credit rating [line items] |  |
Amortized cost | 42 | 16
Fair value | 6,620 | 5,704
Credit rating general account investments, excluding reinsurance assets [member] | Asia [member] | AAA [member] |  |
Disclosure of detailed information about credit rating [line items] |  |
Fair value | 1,032 | 987
Credit rating general account investments, excluding reinsurance assets [member] | Asia [member] | AA [member] |  |
Disclosure of detailed information about credit rating [line items] |  |
Fair value | 500 | 372
Credit rating general account investments, excluding reinsurance assets [member] | Asia [member] | A [member] |  |
Disclosure of detailed information about credit rating [line items] |  |
Fair value | 2,260 | 1,823
Credit rating general account investments, excluding reinsurance assets [member] | Asia [member] | BBB [member] |  |
Disclosure of detailed information about credit rating [line items] |  |
Fair value | 2,530 | 2,186
Credit rating general account investments, excluding reinsurance assets [member] | Asia [member] | BB [member] |  |
Disclosure of detailed information about credit rating [line items] |  |
Fair value | 158 | 140
Credit rating general account investments, excluding reinsurance assets [member] | Asia [member] | B [member] |  |
Disclosure of detailed information about credit rating [line items] |  |
Fair value | 100 | 132
Credit rating general account investments, excluding reinsurance assets [member] | Asia [member] | CCC or lower [member] |  |
Disclosure of detailed information about credit rating [line items] |  |
Fair value | 13 | 22
Credit rating general account investments, excluding reinsurance assets [member] | Asia [member] | Assets not rated [member] |  |
Disclosure of detailed information about credit rating [line items] |  |
Amortized cost | 42 | 16
Fair value | 17 | 14
Credit rating general account investments, excluding reinsurance assets [member] | Asia [member] | Credit rating general account investments [member] |  |
Disclosure of detailed information about credit rating [line items] |  |
Amortized cost | 42 | 16
Fair value | 6,611 | 5,676
Credit rating general account investments, excluding reinsurance assets [member] | Asia [member] | Financial assets past due and or impaired assets [member] |  |
Disclosure of detailed information about credit rating [line items] |  |
Fair value | 9 | 27
Credit rating general account investments, excluding reinsurance assets [member] | Asset management [member] |  |
Disclosure of detailed information about credit rating [line items] |  |
Fair value | 266 | 181
Credit rating general account investments, excluding reinsurance assets [member] | Asset management [member] | AAA [member] |  |
Disclosure of detailed information about credit rating [line items] |  |
Fair value | 164 | 136
Credit rating general account investments, excluding reinsurance assets [member] | Asset management [member] | AA [member] |  |
Disclosure of detailed information about credit rating [line items] |  |
Fair value | 2 |
Credit rating general account investments, excluding reinsurance assets [member] | Asset management [member] | A [member] |  |
Disclosure of detailed information about credit rating [line items] |  |
Fair value | 11 | 5
Credit rating general account investments, excluding reinsurance assets [member] | Asset management [member] | BBB [member] |  |
Disclosure of detailed information about credit rating [line items] |  |
Fair value | 15 | 1
Credit rating general account investments, excluding reinsurance assets [member] | Asset management [member] | BB [member] |  |
Disclosure of detailed information about credit rating [line items] |  |
Fair value | 27 | 9
Credit rating general account investments, excluding reinsurance assets [member] | Asset management [member] | B [member] |  |
Disclosure of detailed information about credit rating [line items] |  |
Fair value | 34 | 17
Credit rating general account investments, excluding reinsurance assets [member] | Asset management [member] | CCC or lower [member] |  |
Disclosure of detailed information about credit rating [line items] |  |
Fair value | 9 | 9
Credit rating general account investments, excluding reinsurance assets [member] | Asset management [member] | Assets not rated [member] |  |
Disclosure of detailed information about credit rating [line items] |  |
Fair value | 5 | 5
Credit rating general account investments, excluding reinsurance assets [member] | Asset management [member] | Credit rating general account investments [member] |  |
Disclosure of detailed information about credit rating [line items] |  |
Fair value | 266 | 181
Credit rating general account investments, excluding reinsurance assets [member] | Asset management [member] | Financial assets past due and or impaired assets [member] |  |
Disclosure of detailed information about credit rating [line items] |  |
Fair value | 0 |
Credit rating general account investments, excluding reinsurance assets [member] | Americas [member] |  |
Disclosure of detailed information about credit rating [line items] |  |
Amortized cost | 10,922 | 9,945
Fair value | 65,635 | 62,847
Credit rating general account investments, excluding reinsurance assets [member] | Americas [member] | AAA [member] |  |
Disclosure of detailed information about credit rating [line items] |  |
Amortized cost | 1,311 | 941
Fair value | 14,664 | 15,338
Credit rating general account investments, excluding reinsurance assets [member] | Americas [member] | AA [member] |  |
Disclosure of detailed information about credit rating [line items] |  |
Amortized cost | 3,671 | 3,104
Fair value | 4,162 | 3,855
Credit rating general account investments, excluding reinsurance assets [member] | Americas [member] | A [member] |  |
Disclosure of detailed information about credit rating [line items] |  |
Amortized cost | 3,580 | 3,567
Fair value | 19,752 | 17,428
Credit rating general account investments, excluding reinsurance assets [member] | Americas [member] | BBB [member] |  |
Disclosure of detailed information about credit rating [line items] |  |
Amortized cost | 275 | 266
Fair value | 19,062 | 17,609
Credit rating general account investments, excluding reinsurance assets [member] | Americas [member] | BB [member] |  |
Disclosure of detailed information about credit rating [line items] |  |
Amortized cost | 15 | 7
Fair value | 1,314 | 1,393
Credit rating general account investments, excluding reinsurance assets [member] | Americas [member] | B [member] |  |
Disclosure of detailed information about credit rating [line items] |  |
Amortized cost | 4 |
Fair value | 926 | 1,013
Credit rating general account investments, excluding reinsurance assets [member] | Americas [member] | CCC or lower [member] |  |
Disclosure of detailed information about credit rating [line items] |  |
Fair value | 677 | 741
Credit rating general account investments, excluding reinsurance assets [member] | Americas [member] | Assets not rated [member] |  |
Disclosure of detailed information about credit rating [line items] |  |
Amortized cost | 1,971 | 1,952
Fair value | 4,028 | 4,126
Credit rating general account investments, excluding reinsurance assets [member] | Americas [member] | Credit rating general account investments [member] |  |
Disclosure of detailed information about credit rating [line items] |  |
Amortized cost | 10,827 | 9,837
Fair value | 64,584 | 61,501
Credit rating general account investments, excluding reinsurance assets [member] | Americas [member] | Financial assets past due and or impaired assets [member] |  |
Disclosure of detailed information about credit rating [line items] |  |
Amortized cost | 95 | 108
Fair value | 1,051 | 1,346
Credit rating general account investments, excluding reinsurance assets [member] | The Netherlands [member] |  |
Disclosure of detailed information about credit rating [line items] |  |
Amortized cost | 33,460 | 32,536
Fair value | 32,609 | 27,930
Credit rating general account investments, excluding reinsurance assets [member] | The Netherlands [member] | AAA [member] |  |
Disclosure of detailed information about credit rating [line items] |  |
Amortized cost | 1,799 | 1,611
Fair value | 13,342 | 12,956
Credit rating general account investments, excluding reinsurance assets [member] | The Netherlands [member] | AA [member] |  |
Disclosure of detailed information about credit rating [line items] |  |
Amortized cost | 82 | 83
Fair value | 7,625 | 6,704
Credit rating general account investments, excluding reinsurance assets [member] | The Netherlands [member] | A [member] |  |
Disclosure of detailed information about credit rating [line items] |  |
Amortized cost | 47 | 55
Fair value | 8,271 | 2,482
Credit rating general account investments, excluding reinsurance assets [member] | The Netherlands [member] | BBB [member] |  |
Disclosure of detailed information about credit rating [line items] |  |
Amortized cost | 970 | 924
Fair value | 1,758 | 1,299
Credit rating general account investments, excluding reinsurance assets [member] | The Netherlands [member] | BB [member] |  |
Disclosure of detailed information about credit rating [line items] |  |
Amortized cost | 49 | 52
Fair value | 97 | 39
Credit rating general account investments, excluding reinsurance assets [member] | The Netherlands [member] | B [member] |  |
Disclosure of detailed information about credit rating [line items] |  |
Fair value | 2 |
Credit rating general account investments, excluding reinsurance assets [member] | The Netherlands [member] | Assets not rated [member] |  |
Disclosure of detailed information about credit rating [line items] |  |
Amortized cost | 30,306 | 29,534
Fair value | 1,493 | 4,423
Credit rating general account investments, excluding reinsurance assets [member] | The Netherlands [member] | Credit rating general account investments [member] |  |
Disclosure of detailed information about credit rating [line items] |  |
Amortized cost | 33,251 | 32,259
Fair value | 32,589 | 27,905
Credit rating general account investments, excluding reinsurance assets [member] | The Netherlands [member] | Financial assets past due and or impaired assets [member] |  |
Disclosure of detailed information about credit rating [line items] |  |
Amortized cost | 210 | 277
Fair value | 19 | 25
Credit rating general account investments, excluding reinsurance assets [member] | United Kingdom [member] |  |
Disclosure of detailed information about credit rating [line items] |  |
Fair value | 2,103 | 2,149
Credit rating general account investments, excluding reinsurance assets [member] | United Kingdom [member] | AAA [member] |  |
Disclosure of detailed information about credit rating [line items] |  |
Fair value | 91 | 84
Credit rating general account investments, excluding reinsurance assets [member] | United Kingdom [member] | AA [member] |  |
Disclosure of detailed information about credit rating [line items] |  |
Fair value | 624 | 594
Credit rating general account investments, excluding reinsurance assets [member] | United Kingdom [member] | A [member] |  |
Disclosure of detailed information about credit rating [line items] |  |
Fair value | 307 | 291
Credit rating general account investments, excluding reinsurance assets [member] | United Kingdom [member] | BBB [member] |  |
Disclosure of detailed information about credit rating [line items] |  |
Fair value | 120 | 95
Credit rating general account investments, excluding reinsurance assets [member] | United Kingdom [member] | BB [member] |  |
Disclosure of detailed information about credit rating [line items] |  |
Fair value | 1 | 1
Credit rating general account investments, excluding reinsurance assets [member] | United Kingdom [member] | Assets not rated [member] |  |
Disclosure of detailed information about credit rating [line items] |  |
Fair value | 959 | 1,085
Credit rating general account investments, excluding reinsurance assets [member] | United Kingdom [member] | Credit rating general account investments [member] |  |
Disclosure of detailed information about credit rating [line items] |  |
Fair value | 2,103 | 2,149
Credit rating general account investments, excluding reinsurance assets [member] | Southern & Eastern Europe [member] |  |
Disclosure of detailed information about credit rating [line items] |  |
Amortized cost | 118 | 143
Fair value | 1,574 | 1,497
Credit rating general account investments, excluding reinsurance assets [member] | Southern & Eastern Europe [member] | AAA [member] |  |
Disclosure of detailed information about credit rating [line items] |  |
Fair value | 15 | 10
Credit rating general account investments, excluding reinsurance assets [member] | Southern & Eastern Europe [member] | AA [member] |  |
Disclosure of detailed information about credit rating [line items] |  |
Fair value | 101 | 100
Credit rating general account investments, excluding reinsurance assets [member] | Southern & Eastern Europe [member] | A [member] |  |
Disclosure of detailed information about credit rating [line items] |  |
Amortized cost | 61 | 54
Fair value | 592 | 505
Credit rating general account investments, excluding reinsurance assets [member] | Southern & Eastern Europe [member] | BBB [member] |  |
Disclosure of detailed information about credit rating [line items] |  |
Amortized cost | 5 | 3
Fair value | 572 | 682
Credit rating general account investments, excluding reinsurance assets [member] | Southern & Eastern Europe [member] | BB [member] |  |
Disclosure of detailed information about credit rating [line items] |  |
Amortized cost |  | 9
Fair value | 10 | 22
Credit rating general account investments, excluding reinsurance assets [member] | Southern & Eastern Europe [member] | B [member] |  |
Disclosure of detailed information about credit rating [line items] |  |
Amortized cost | 36 | 64
Fair value | 212 | 105
Credit rating general account investments, excluding reinsurance assets [member] | Southern & Eastern Europe [member] | CCC or lower [member] |  |
Disclosure of detailed information about credit rating [line items] |  |
Amortized cost |  | 1
Fair value | 1 | 1
Credit rating general account investments, excluding reinsurance assets [member] | Southern & Eastern Europe [member] | Assets not rated [member] |  |
Disclosure of detailed information about credit rating [line items] |  |
Amortized cost | 16 | 13
Fair value | 72 | 70
Credit rating general account investments, excluding reinsurance assets [member] | Southern & Eastern Europe [member] | Credit rating general account investments [member] |  |
Disclosure of detailed information about credit rating [line items] |  |
Amortized cost | 118 | 143
Fair value | € 1,574 | 1,496
Credit rating general account investments, excluding reinsurance assets [member] | Southern & Eastern Europe [member] | Financial assets past due and or impaired assets [member] |  |
Disclosure of detailed information about credit rating [line items] |  |
Fair value |  | € 1

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