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Segments - Summary of geographical segments banking (Details) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disclosure of operating segments [line items] |  |  |
– Net interest income | € 16,162 | € 14,593 | € 14,000
– Net fee and commission income | 3,595 | 3,586 | 3,517
Total income | 18,121 | 30,418 | 20,093
Addition to loan loss provisions | 520 | 1,861 | 516
Total expenses | 12,084 | 13,060 | 11,708
Result before taxation | 6,037 | 17,358 | 8,385
Taxation | 1,662 | 5,130 | 2,306
Non-controlling interests | 235 | 102 | 128
Net result | 4,140 | 12,126 | 5,951
Segments banking activities |  |  |
Disclosure of operating segments [line items] |  |  |
Net result | 4,140 | 12,126 | 5,951
Net result IFRS-EU | Segments banking activities |  |  |
Disclosure of operating segments [line items] |  |  |
– Net interest income | 15,976 | 13,756 | 13,615
– Net fee and commission income | 3,595 | 3,586 | 3,517
– Total investment and other income | 3,005 | 1,219 | 1,359
Total income | 22,575 | 18,561 | 18,490
– Operating expenses | 11,564 | 11,199 | 11,192
Addition to loan loss provisions | 520 | 1,861 | 516
Total expenses | 12,084 | 13,060 | 11,708
Result before taxation | 10,492 | 5,502 | 6,782
Taxation | 2,970 | 1,725 | 1,877
Non-controlling interests | 235 | 102 | 128
Net result | 7,287 | 3,674 | 4,776
Adjustment of the EU 'IAS 39 carve out' |  |  |
Disclosure of operating segments [line items] |  |  |
Taxation | 1,308 | (3,405) | (429)
Net result | 3,147 | (8,451) | (1,174)
Adjustment of the EU 'IAS 39 carve out' | Segments banking activities |  |  |
Disclosure of operating segments [line items] |  |  |
Net result | (3,147) | 8,451 | 1,174
Retail Netherlands |  |  |
Disclosure of operating segments [line items] |  |  |
Net result | 2,499 | 4,510 | 2,312
Retail Belgium |  |  |
Disclosure of operating segments [line items] |  |  |
Net result | (123) | 1,871 | 755
Retail Germany |  |  |
Disclosure of operating segments [line items] |  |  |
Net result | (326) | 4,547 | 1,149
Other Challengers |  |  |
Disclosure of operating segments [line items] |  |  |
Net result | 649 | 552 | 355
Growth markets 1,2,3 |  |  |
Disclosure of operating segments [line items] |  |  |
Net result | 690 | 316 | 506
Wholesale Banking Rest of World |  |  |
Disclosure of operating segments [line items] |  |  |
Net result | 988 | 845 | 1,134
Other |  |  |
Disclosure of operating segments [line items] |  |  |
Net result | (237) | (515) | (260)
Geographical Segments Banking | Net result IFRS-EU |  |  |
Disclosure of operating segments [line items] |  |  |
– Net interest income | 15,976 | 13,756 | 13,615
– Net fee and commission income | 3,595 | 3,586 | 3,517
– Total investment and other income | 3,005 | 1,219 | 1,359
Total income | 22,575 | 18,561 | 18,490
– Operating expenses | 11,564 | 11,199 | 11,192
Addition to loan loss provisions | 520 | 1,861 | 516
Total expenses | 12,084 | 13,060 | 11,708
Result before taxation | 10,492 | 5,502 | 6,782
Taxation | 2,970 | 1,725 | 1,877
Non-controlling interests | 235 | 102 | 128
Net result | 7,287 | 3,674 | 4,776
Geographical Segments Banking | Retail Netherlands | Net result IFRS-EU |  |  |
Disclosure of operating segments [line items] |  |  |
– Net interest income | 3,773 | 3,782 | 4,068
– Net fee and commission income | 1,239 | 1,171 | 1,070
– Total investment and other income | 1,627 | 577 | 314
Total income | 6,639 | 5,531 | 5,452
– Operating expenses | 3,065 | 3,001 | 3,279
Addition to loan loss provisions | (111) | 181 | 28
Total expenses | 2,954 | 3,182 | 3,307
Result before taxation | 3,685 | 2,349 | 2,145
Taxation | 909 | 658 | 556
Net result | 2,776 | 1,691 | 1,589
Geographical Segments Banking | Retail Netherlands | Adjustment of the EU 'IAS 39 carve out' |  |  |
Disclosure of operating segments [line items] |  |  |
Net result | (277) | 2,818 | 723
Geographical Segments Banking | Retail Belgium | Net result IFRS-EU |  |  |
Disclosure of operating segments [line items] |  |  |
– Net interest income | 2,712 | 2,065 | 2,109
– Net fee and commission income | 715 | 714 | 717
– Total investment and other income | 145 | (14) | 265
Total income | 3,573 | 2,765 | 3,092
– Operating expenses | 2,195 | 2,120 | 1,960
Addition to loan loss provisions | 139 | 230 | 184
Total expenses | 2,334 | 2,350 | 2,143
Result before taxation | 1,239 | 415 | 948
Taxation | 349 | 114 | 240
Net result | 889 | 301 | 708
Geographical Segments Banking | Retail Belgium | Adjustment of the EU 'IAS 39 carve out' |  |  |
Disclosure of operating segments [line items] |  |  |
Net result | (1,012) | 1,570 | 47
Geographical Segments Banking | Retail Germany | Net result IFRS-EU |  |  |
Disclosure of operating segments [line items] |  |  |
– Net interest income | 3,375 | 2,126 | 1,938
– Net fee and commission income | 400 | 494 | 523
– Total investment and other income | (81) | 94 | 118
Total income | 3,694 | 2,714 | 2,578
– Operating expenses | 1,437 | 1,318 | 1,339
Addition to loan loss provisions | 35 | 460 | 118
Total expenses | 1,472 | 1,778 | 1,457
Result before taxation | 2,222 | 936 | 1,121
Taxation | 723 | 297 | 358
Non-controlling interests |  | 3 | 4
Net result | 1,499 | 636 | 759
Geographical Segments Banking | Retail Germany | Adjustment of the EU 'IAS 39 carve out' |  |  |
Disclosure of operating segments [line items] |  |  |
Net result | (1,825) | 3,911 | 390
Geographical Segments Banking | Other Challengers | Net result IFRS-EU |  |  |
Disclosure of operating segments [line items] |  |  |
– Net interest income | 2,121 | 1,842 | 1,679
– Net fee and commission income | 285 | 290 | 300
– Total investment and other income | 21 | 182 | 64
Total income | 2,427 | 2,314 | 2,043
– Operating expenses | 1,320 | 1,380 | 1,449
Addition to loan loss provisions | 166 | 140 | 84
Total expenses | 1,486 | 1,519 | 1,533
Result before taxation | 941 | 795 | 511
Taxation | 282 | 258 | 156
Net result | 659 | 537 | 355
Geographical Segments Banking | Other Challengers | Adjustment of the EU 'IAS 39 carve out' |  |  |
Disclosure of operating segments [line items] |  |  |
Net result | (9) | 15 |
Geographical Segments Banking | Growth markets 1,2,3 | Net result IFRS-EU |  |  |
Disclosure of operating segments [line items] |  |  |
– Net interest income | 1,961 | 1,462 | 1,528
– Net fee and commission income | 384 | 375 | 351
– Total investment and other income | 487 | 386 | 289
Total income | 2,833 | 2,223 | 2,168
– Operating expenses | 1,495 | 1,426 | 1,254
Addition to loan loss provisions | 189 | 230 | 110
Total expenses | 1,683 | 1,657 | 1,363
Result before taxation | 1,149 | 567 | 804
Taxation | 225 | 153 | 174
Non-controlling interests | 234 | 98 | 124
Net result | 690 | 316 | 506
Geographical Segments Banking | Wholesale Banking Rest of World | Net result IFRS-EU |  |  |
Disclosure of operating segments [line items] |  |  |
– Net interest income | 1,548 | 1,933 | 2,021
– Net fee and commission income | 573 | 548 | 553
– Total investment and other income | 829 | 449 | 196
Total income | 2,950 | 2,930 | 2,770
– Operating expenses | 1,509 | 1,418 | 1,332
Addition to loan loss provisions | 96 | 618 | (8)
Total expenses | 1,605 | 2,036 | 1,324
Result before taxation | 1,345 | 894 | 1,446
Taxation | 335 | 186 | 326
Net result | 1,011 | 708 | 1,120
Geographical Segments Banking | Other | Net result IFRS-EU |  |  |
Disclosure of operating segments [line items] |  |  |
– Net interest income | 486 | 546 | 271
– Net fee and commission income | (1) | (6) | 3
– Total investment and other income | (25) | (455) | 113
Total income | 460 | 84 | 387
– Operating expenses | 544 | 536 | 580
Addition to loan loss provisions | 5 | 2 |
Total expenses | 549 | 538 | 580
Result before taxation | (89) | (454) | (193)
Taxation | 148 | 60 | 67
Non-controlling interests |  | 1 |
Net result | (237) | (515) | (260)
Retail Banking | Net result IFRS-EU |  |  |
Disclosure of operating segments [line items] |  |  |
Result before taxation | 6,753 | 3,964 | 4,101
Retail Banking | Retail Netherlands | Net result IFRS-EU |  |  |
Disclosure of operating segments [line items] |  |  |
Result before taxation | 2,861 | 2,014 | 1,936
Retail Banking | Retail Belgium | Net result IFRS-EU |  |  |
Disclosure of operating segments [line items] |  |  |
Result before taxation | 661 | 223 | 583
Retail Banking | Retail Germany | Net result IFRS-EU |  |  |
Disclosure of operating segments [line items] |  |  |
Result before taxation | 1,790 | 901 | 786
Retail Banking | Other Challengers | Net result IFRS-EU |  |  |
Disclosure of operating segments [line items] |  |  |
Result before taxation | 649 | 547 | 206
Retail Banking | Growth markets 1,2,3 | Net result IFRS-EU |  |  |
Disclosure of operating segments [line items] |  |  |
Result before taxation | 792 | 278 | 590
Wholesale Banking | Segments banking activities |  |  |
Disclosure of operating segments [line items] |  |  |
Net result | (272) | 9,810 | 3,318
Wholesale Banking | Net result IFRS-EU |  |  |
Disclosure of operating segments [line items] |  |  |
Result before taxation | 3,836 | 1,991 | 2,874
Wholesale Banking | Net result IFRS-EU | Segments banking activities |  |  |
Disclosure of operating segments [line items] |  |  |
– Net interest income | 4,028 | 4,260 | 4,151
– Net fee and commission income | 1,259 | 1,217 | 1,197
– Total investment and other income | 1,771 | 849 | 568
Total income | 7,057 | 6,325 | 5,916
– Operating expenses | 3,313 | 3,114 | 2,926
Addition to loan loss provisions | (92) | 1,220 | 117
Total expenses | 3,222 | 4,334 | 3,042
Result before taxation | 3,836 | 1,991 | 2,874
Taxation | 900 | 581 | 703
Non-controlling interests | 61 | 52 | 26
Net result | 2,875 | 1,358 | 2,144
Wholesale Banking | Adjustment of the EU 'IAS 39 carve out' | Segments banking activities |  |  |
Disclosure of operating segments [line items] |  |  |
Net result | (3,147) | 8,451 | 1,174
Wholesale Banking | Retail Netherlands | Net result IFRS-EU |  |  |
Disclosure of operating segments [line items] |  |  |
Result before taxation | 824 | 335 | 209
Wholesale Banking | Retail Belgium | Net result IFRS-EU |  |  |
Disclosure of operating segments [line items] |  |  |
Result before taxation | 577 | 192 | 365
Wholesale Banking | Retail Germany | Net result IFRS-EU |  |  |
Disclosure of operating segments [line items] |  |  |
Result before taxation | 432 | 34 | 336
Wholesale Banking | Other Challengers | Net result IFRS-EU |  |  |
Disclosure of operating segments [line items] |  |  |
Result before taxation | 292 | 248 | 304
Wholesale Banking | Growth markets 1,2,3 | Net result IFRS-EU |  |  |
Disclosure of operating segments [line items] |  |  |
Result before taxation | 357 | 288 | 214
Wholesale Banking | Wholesale Banking Rest of World | Net result IFRS-EU |  |  |
Disclosure of operating segments [line items] |  |  |
Result before taxation | 1,345 | 894 | 1,446
Wholesale Banking | Wholesale Banking Rest of World | Adjustment of the EU 'IAS 39 carve out' | Segments banking activities |  |  |
Disclosure of operating segments [line items] |  |  |
Net result | (23) | 137 | 14
Wholesale Banking | Other | Net result IFRS-EU |  |  |
Disclosure of operating segments [line items] |  |  |
Result before taxation | 8 |  |
Corporate Line |  |  |
Disclosure of operating segments [line items] |  |  |
Non-controlling interests |  | 1 |
Corporate Line | Segments banking activities |  |  |
Disclosure of operating segments [line items] |  |  |
Net result | (255) | (530) | (261)
Corporate Line | Net result IFRS-EU |  |  |
Disclosure of operating segments [line items] |  |  |
Result before taxation | (97) | (453) | (193)
Corporate Line | Net result IFRS-EU | Segments banking activities |  |  |
Disclosure of operating segments [line items] |  |  |
– Net interest income | 489 | 550 | 270
– Net fee and commission income | (1) | (6) | 3
– Total investment and other income | (38) | (460) | 114
Total income | 450 | 84 | 387
– Operating expenses | 542 | 535 | 580
Addition to loan loss provisions | 5 | 2 |
Total expenses | 547 | 537 | 580
Result before taxation | (97) | (453) | (193)
Taxation | 158 | 76 | 68
Non-controlling interests | 0 |  | 0
Net result | (255) | (530) | (261)
Corporate Line | Other | Net result IFRS-EU |  |  |
Disclosure of operating segments [line items] |  |  |
Result before taxation | € (97) | € (453) | € (193)

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