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Risk management - Outstandings per line of business (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio € 931,552 € 938,061
Increase (decrease) in portfolio size € (6,500)  
Percentage of increase (decrease) in portfolio size (0.69%)  
Percentage of volume increase (0.70%)  
Industry composition percentage 38.80% 37.80%
Natural Resources    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio € 42,394 € 46,549
Increase (decrease) in maximum exposure to credit risk (4,200)  
Private Individuals    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 361,387 354,831
Central Banks    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 94,147 105,043
Real Estate    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 51,515 52,513
Commercial Banks    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 46,040 50,862
Non-Bank Financial Institutions    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 57,889 56,594
Central Governments    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 52,621 49,356
Transportation & Logistics    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 32,890 30,982
Utilities    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 25,509 24,698
Food, Beverages & Personal Care    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 23,386 23,623
Services    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 22,023 22,546
General Industries    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 21,126 20,865
Lower Public Administration    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 23,704 21,666
Other economic sector    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 76,922 77,932
Investment grade    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio € 715,602 € 714,997
Rating class concentration increase or (decrease) percentage 76.80% 76.20%
Non-Investment grade    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio € 197,949 € 203,786
Rating class concentration increase or (decrease) percentage 21.20% 21.70%
Performing restructuring    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio € 6,327 € 7,569
Rating class concentration increase or (decrease) percentage 0.70% 0.80%
Non-performing loans    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio € 11,673 € 11,708
Rating class concentration increase or (decrease) percentage 1.30% 1.20%
1 (AAA)    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio € 89,631 € 125,032
2-4 (AA)    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 126,694 97,701
5-7 (A)    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 227,543 186,504
8-10 (BBB)    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 271,733 305,760
11-13 (BB)    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 151,756 159,016
14-16 (B)    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 41,565 39,579
17 (CCC)    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 4,628 5,192
18 (CC)    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 4,481 5,386
19 (C)    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 1,848 2,183
20-22 (D)    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 11,673 11,708
Netherlands    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 213,486 218,548
Increase (decrease) in portfolio size € (4,200)  
Percentage of volume increase (2.30%)  
Industry composition percentage 55.00%  
Netherlands | Natural Resources    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio € 2,623 3,084
Netherlands | Private Individuals    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 116,530 114,625
Netherlands | Central Banks    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 31,017 35,202
Netherlands | Real Estate    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 16,907 17,586
Netherlands | Commercial Banks    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 1,217 1,358
Netherlands | Non-Bank Financial Institutions    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 2,573 2,710
Netherlands | Central Governments    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 1,620 3,342
Netherlands | Transportation & Logistics    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 3,860 3,967
Netherlands | Utilities    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 2,419 1,551
Netherlands | Food, Beverages & Personal Care    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 7,138 7,249
Netherlands | Services    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 5,073 4,819
Netherlands | General Industries    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 5,746 5,430
Netherlands | Lower Public Administration    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 253 272
Netherlands | Other economic sector    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 16,510 17,353
Netherlands | Investment grade    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 170,067 174,971
Netherlands | Non-Investment grade    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 40,399 40,325
Netherlands | Performing restructuring    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 1,433 1,508
Netherlands | Non-performing loans    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 1,587 1,743
Belgium    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 115,921 116,580
Belgium | Natural Resources    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 1,346 1,356
Belgium | Private Individuals    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 44,637 44,193
Belgium | Central Banks    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 9,756 14,338
Belgium | Real Estate    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 10,986 10,112
Belgium | Commercial Banks    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 404 265
Belgium | Non-Bank Financial Institutions    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 1,457 1,041
Belgium | Central Governments    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 9,046 7,716
Belgium | Transportation & Logistics    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 2,198 2,183
Belgium | Utilities    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 1,634 1,630
Belgium | Food, Beverages & Personal Care    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 3,127 3,002
Belgium | Services    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 8,463 8,816
Belgium | General Industries    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 2,604 2,689
Belgium | Lower Public Administration    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 6,607 5,638
Belgium | Other economic sector    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 13,657 13,602
Belgium | Investment grade    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 71,730 76,244
Belgium | Non-Investment grade    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 40,236 36,036
Belgium | Performing restructuring    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 799 984
Belgium | Non-performing loans    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 3,156 3,316
Germany    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio € 155,067 152,730
Industry composition percentage 67.00%  
Germany | Natural Resources    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio € 1,017 809
Germany | Private Individuals    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 103,151 101,529
Germany | Central Banks    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 18,945 21,041
Germany | Real Estate    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 1,111 1,388
Germany | Commercial Banks    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 4,050 3,974
Germany | Non-Bank Financial Institutions    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 5,710 5,054
Germany | Central Governments    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 699 1,179
Germany | Transportation & Logistics    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 1,277 608
Germany | Utilities    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 3,516 2,814
Germany | Food, Beverages & Personal Care    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 550 573
Germany | Services    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 1,725 1,254
Germany | General Industries    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 1,193 1,007
Germany | Lower Public Administration    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 5,349 5,197
Germany | Other economic sector    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 6,774 6,302
Germany | Investment grade    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 136,675 130,285
Germany | Non-Investment grade    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 16,929 20,967
Germany | Performing restructuring    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 349 579
Germany | Non-performing loans    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 1,114 899
Poland    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 49,317 43,229
Poland | Natural Resources    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 685 746
Poland | Private Individuals    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 14,860 13,767
Poland | Central Banks    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 2,530 1,060
Poland | Real Estate    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 2,184 2,374
Poland | Commercial Banks    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 601 551
Poland | Non-Bank Financial Institutions    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 2,532 2,299
Poland | Central Governments    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 8,614 6,578
Poland | Transportation & Logistics    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 1,598 1,300
Poland | Utilities    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 792 679
Poland | Food, Beverages & Personal Care    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 2,242 2,334
Poland | Services    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 1,325 1,101
Poland | General Industries    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 2,827 2,849
Poland | Lower Public Administration    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 669 644
Poland | Other economic sector    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 7,858 6,946
Poland | Investment grade    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 31,772 27,501
Poland | Non-Investment grade    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 15,785 14,596
Poland | Performing restructuring    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 830 422
Poland | Non-performing loans    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 929 710
Spain    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio € 38,240 36,237
Industry composition percentage 67.00%  
Spain | Natural Resources    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio € 129 169
Spain | Private Individuals    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 25,452 24,865
Spain | Central Banks    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 489 347
Spain | Real Estate    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 1,551 1,391
Spain | Commercial Banks    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 353 402
Spain | Non-Bank Financial Institutions    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 652 99
Spain | Central Governments    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 5,491 4,578
Spain | Transportation & Logistics    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 658 690
Spain | Utilities    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 912 1,227
Spain | Food, Beverages & Personal Care    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 490 475
Spain | Services    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 71 67
Spain | General Industries    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 333 311
Spain | Lower Public Administration    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 350 200
Spain | Other economic sector    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 1,309 1,416
Spain | Investment grade    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 29,583 28,556
Spain | Non-Investment grade    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 8,134 7,330
Spain | Performing restructuring    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 230 105
Spain | Non-performing loans    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 293 246
United Kingdom    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 28,974 28,179
United Kingdom | Natural Resources    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 3,789 4,442
United Kingdom | Private Individuals    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 128 138
United Kingdom | Central Banks    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 4,335 427
United Kingdom | Real Estate    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 420 413
United Kingdom | Commercial Banks    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 4,488 4,933
United Kingdom | Non-Bank Financial Institutions    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 6,837 8,229
United Kingdom | Central Governments    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 41 46
United Kingdom | Transportation & Logistics    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 2,113 1,787
United Kingdom | Utilities    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 2,723 2,953
United Kingdom | Food, Beverages & Personal Care    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 540 739
United Kingdom | Services    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 745 685
United Kingdom | General Industries    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 199 330
United Kingdom | Lower Public Administration    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio
United Kingdom | Other economic sector    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 2,615 3,058
United Kingdom | Investment grade    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 24,299 23,160
United Kingdom | Non-Investment grade    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 4,508 4,634
United Kingdom | Performing restructuring    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 2 41
United Kingdom | Non-performing loans    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 165 344
Luxembourg    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio € 29,363 31,720
Percentage of volume increase (7.40%)  
Luxembourg | Natural Resources    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio € 2,511 2,764
Luxembourg | Private Individuals    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 3,347 3,486
Luxembourg | Central Banks    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 4,853 6,820
Luxembourg | Real Estate    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 3,563 3,797
Luxembourg | Commercial Banks    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 5,070 4,480
Luxembourg | Non-Bank Financial Institutions    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 4,631 4,489
Luxembourg | Central Governments    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 79 175
Luxembourg | Transportation & Logistics    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 596 583
Luxembourg | Utilities    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 480 572
Luxembourg | Food, Beverages & Personal Care    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 1,505 1,667
Luxembourg | Services    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 502 808
Luxembourg | General Industries    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 649 604
Luxembourg | Lower Public Administration    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 249 313
Luxembourg | Other economic sector    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 1,326 1,164
Luxembourg | Investment grade    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 24,083 26,053
Luxembourg | Non-Investment grade    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 5,013 5,442
Luxembourg | Performing restructuring    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 105 80
Luxembourg | Non-performing loans    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 162 145
France    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 24,650 23,576
France | Natural Resources    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 429 470
France | Private Individuals    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 2,472 2,731
France | Central Banks    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 35
France | Real Estate    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 2,901 3,155
France | Commercial Banks    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 4,155 4,371
France | Non-Bank Financial Institutions    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 4,274 3,220
France | Central Governments    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 2,255 1,797
France | Transportation & Logistics    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 784 733
France | Utilities    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 619 980
France | Food, Beverages & Personal Care    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 1,250 469
France | Services    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 380 1,066
France | General Industries    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 287 245
France | Lower Public Administration    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 3,488 3,126
France | Other economic sector    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 1,356 1,179
France | Investment grade    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 18,692 17,545
France | Non-Investment grade    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 5,713 5,814
France | Performing restructuring    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 122 16
France | Non-performing loans    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 124 201
Rest of Europe    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 85,558 96,989
Rest of Europe | Natural Resources    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 10,608 12,154
Rest of Europe | Private Individuals    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 14,179 13,654
Rest of Europe | Central Banks    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 6,166 18,092
Rest of Europe | Real Estate    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 3,492 3,378
Rest of Europe | Commercial Banks    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 6,757 6,368
Rest of Europe | Non-Bank Financial Institutions    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 4,269 4,495
Rest of Europe | Central Governments    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 9,384 8,444
Rest of Europe | Transportation & Logistics    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 8,177 7,808
Rest of Europe | Utilities    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 4,469 4,302
Rest of Europe | Food, Beverages & Personal Care    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 2,455 2,668
Rest of Europe | Services    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 1,052 1,120
Rest of Europe | General Industries    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 3,661 3,152
Rest of Europe | Lower Public Administration    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 356 402
Rest of Europe | Other economic sector    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 10,532 10,952
Rest of Europe | Investment grade    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 56,404 64,884
Rest of Europe | Non-Investment grade    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 25,967 27,617
Rest of Europe | Performing restructuring    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 1,983 2,903
Rest of Europe | Non-performing loans    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 1,205 1,584
America    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 81,114 82,786
America | Natural Resources    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 8,237 8,771
America | Private Individuals    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 149 161
America | Central Banks    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio
America | Real Estate    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 3,323 3,474
America | Commercial Banks    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 9,833 9,945
America | Non-Bank Financial Institutions    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 20,118 19,971
America | Central Governments    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 13,752 13,979
America | Transportation & Logistics    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 3,511 3,378
America | Utilities    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 4,424 4,347
America | Food, Beverages & Personal Care    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 2,652 3,245
America | Services    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 1,576 1,821
America | General Industries    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 2,848 2,926
America | Lower Public Administration    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 1,550 1,310
America | Other economic sector    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 9,141 9,457
America | Investment grade    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 63,652 64,206
America | Non-Investment grade    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 16,003 17,615
America | Performing restructuring    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 245 311
America | Non-performing loans    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 1,213 654
Asia    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 52,374 48,989
Asia | Natural Resources    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 9,785 10,398
Asia | Private Individuals    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 121 131
Asia | Central Banks    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 13,668 4,962
Asia | Real Estate    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 1,367 1,180
Asia | Commercial Banks    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 8,182 12,041
Asia | Non-Bank Financial Institutions    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 3,884 4,091
Asia | Central Governments    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 520 333
Asia | Transportation & Logistics    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 7,044 6,806
Asia | Utilities    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 1,306 1,545
Asia | Food, Beverages & Personal Care    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 1,140 942
Asia | Services    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 469 357
Asia | General Industries    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 761 1,311
Asia | Lower Public Administration    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 7
Asia | Other economic sector    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 4,120 4,891
Asia | Investment grade    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 44,481 39,903
Asia | Non-Investment grade    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 6,770 7,638
Asia | Performing restructuring    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 72 124
Asia | Non-performing loans    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 1,051 1,325
Australia    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio € 55,389 56,116
Industry composition percentage 66.00%  
Australia | Natural Resources    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio € 941 1,028
Australia | Private Individuals    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 36,340 35,528
Australia | Central Banks    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 2,379 2,695
Australia | Real Estate    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 3,709 4,263
Australia | Commercial Banks    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 719 1,765
Australia | Non-Bank Financial Institutions    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 950 896
Australia | Central Governments    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 526 636
Australia | Transportation & Logistics    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 456 531
Australia | Utilities    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 2,041 1,897
Australia | Food, Beverages & Personal Care    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 281 248
Australia | Services    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 642 632
Australia | General Industries    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 18 9
Australia | Lower Public Administration    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 4,826 4,564
Australia | Other economic sector    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 1,562 1,424
Australia | Investment grade    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 44,139 41,476
Australia | Non-Investment grade    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 10,715 13,914
Australia | Performing restructuring    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 132 257
Australia | Non-performing loans    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 403 470
Africa    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 2,098 2,381
Africa | Natural Resources    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 295 361
Africa | Private Individuals    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 20 24
Africa | Central Banks    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 9 24
Africa | Real Estate    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 2
Africa | Commercial Banks    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 210 409
Africa | Non-Bank Financial Institutions    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio
Africa | Central Governments    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 593 551
Africa | Transportation & Logistics    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 618 608
Africa | Utilities    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 173 200
Africa | Food, Beverages & Personal Care    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 18 13
Africa | Services    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio
Africa | General Industries    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio
Africa | Lower Public Administration    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio
Africa | Other economic sector    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 163 188
Africa | Investment grade    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 24 213
Africa | Non-Investment grade    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 1,776 1,858
Africa | Performing restructuring    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 26 239
Africa | Non-performing loans    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 272 72
Wholesale Banking    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 415,914 428,616
Foreign exchange rate changes, negative impact on portfolio growth amount € 4,600  
Foreign exchange rate changes, negative impact on portfolio growth percent (3.80%)  
Wholesale Banking | Natural Resources    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio € 40,511 44,695
Wholesale Banking | Private Individuals    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 2,330 32
Wholesale Banking | Central Banks    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 70,139 80,006
Wholesale Banking | Real Estate    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 24,904 26,426
Wholesale Banking | Commercial Banks    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 37,342 42,036
Wholesale Banking | Non-Bank Financial Institutions    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 55,313 54,274
Wholesale Banking | Central Governments    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 45,316 41,622
Wholesale Banking | Transportation & Logistics    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 27,106 25,474
Wholesale Banking | Utilities    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 23,324 22,683
Wholesale Banking | Food, Beverages & Personal Care    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 13,503 13,681
Wholesale Banking | Services    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 9,128 9,926
Wholesale Banking | General Industries    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 12,039 11,731
Wholesale Banking | Lower Public Administration    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 6,211 6,020
Wholesale Banking | Other economic sector    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio € 48,748 € 50,009
Wholesale Banking | Australian Dollar    
Disclosure of credit risk exposure [line items]    
Appreciation (depreciation) in currency value (3.40%)  
Wholesale Banking | Turkish Lira    
Disclosure of credit risk exposure [line items]    
Appreciation (depreciation) in currency value (42.10%)  
Wholesale Banking | Polish Zloty    
Disclosure of credit risk exposure [line items]    
Appreciation (depreciation) in currency value 6.80%  
Wholesale Banking | Investment grade    
Disclosure of credit risk exposure [line items]    
Rating class concentration increase or (decrease) percentage 81.20%  
Wholesale Banking | Non-Investment grade    
Disclosure of credit risk exposure [line items]    
Rating class concentration increase or (decrease) percentage 17.10% 16.80%
Wholesale Banking | Performing restructuring    
Disclosure of credit risk exposure [line items]    
Rating class concentration increase or (decrease) percentage 0.70% 1.00%
Wholesale Banking | Non-performing loans    
Disclosure of credit risk exposure [line items]    
Rating class concentration increase or (decrease) percentage 1.00%  
Wholesale Banking | 1 (AAA)    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio € 52,665 € 89,686
Wholesale Banking | 2-4 (AA)    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 67,034 49,320
Wholesale Banking | 5-7 (A)    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 95,320 79,292
Wholesale Banking | 8-10 (BBB)    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 123,081 129,709
Wholesale Banking | 11-13 (BB)    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 57,348 56,409
Wholesale Banking | 14-16 (B)    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 12,234 13,693
Wholesale Banking | 17 (CCC)    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 1,122 1,858
Wholesale Banking | 18 (CC)    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 2,523 3,564
Wholesale Banking | 19 (C)    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 535 731
Wholesale Banking | 20-22 (D)    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 4,051 4,354
Wholesale Banking | Netherlands    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 54,938 61,143
Wholesale Banking | Belgium    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 24,171 27,144
Wholesale Banking | Germany    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 26,152 24,441
Wholesale Banking | Poland    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 20,346 16,350
Wholesale Banking | Spain    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 11,047 10,491
Wholesale Banking | United Kingdom    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 28,587 27,735
Wholesale Banking | Luxembourg    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 23,805 26,113
Wholesale Banking | France    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 21,528 18,484
Wholesale Banking | Rest of Europe    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 65,157 77,814
Wholesale Banking | America    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 78,851 80,444
Wholesale Banking | Asia    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 49,851 46,291
Wholesale Banking | Australia    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 9,409 9,817
Wholesale Banking | Africa    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 2,071 2,348
Retail Benelux    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 253,241 250,056
Retail Benelux | Natural Resources    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 1,259 1,160
Retail Benelux | Private Individuals    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 165,447 163,243
Retail Benelux | Central Banks    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio
Retail Benelux | Real Estate    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 23,675 22,648
Retail Benelux | Commercial Banks    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 177 194
Retail Benelux | Non-Bank Financial Institutions    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 1,400 1,379
Retail Benelux | Central Governments    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 2,124 2,880
Retail Benelux | Transportation & Logistics    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 4,105 4,038
Retail Benelux | Utilities    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 2,024 1,865
Retail Benelux | Food, Beverages & Personal Care    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 7,307 7,356
Retail Benelux | Services    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 11,596 11,606
Retail Benelux | General Industries    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 5,680 5,753
Retail Benelux | Lower Public Administration    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 6,885 5,921
Retail Benelux | Other economic sector    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio € 21,563 € 22,014
Retail Benelux | Non-Investment grade    
Disclosure of credit risk exposure [line items]    
Rating class concentration increase or (decrease) percentage 30.30% 28.90%
Retail Benelux | Performing restructuring    
Disclosure of credit risk exposure [line items]    
Rating class concentration increase or (decrease) percentage 0.90%  
Retail Benelux | Non-performing loans    
Disclosure of credit risk exposure [line items]    
Rating class concentration increase or (decrease) percentage 1.80% 1.90%
Retail Benelux | 1 (AAA)    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio € 310 € 324
Retail Benelux | 2-4 (AA)    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 7,089 7,871
Retail Benelux | 5-7 (A)    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 44,026 45,471
Retail Benelux | 8-10 (BBB)    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 118,340 117,172
Retail Benelux | 11-13 (BB)    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 57,652 55,945
Retail Benelux | 14-16 (B)    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 16,872 14,224
Retail Benelux | 17 (CCC)    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 2,129 2,021
Retail Benelux | 18 (CC)    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 1,363 1,304
Retail Benelux | 19 (C)    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 876 962
Retail Benelux | 20-22 (D)    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 4,586 4,762
Retail Benelux | Netherlands    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 155,792 154,253
Retail Benelux | Belgium    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 90,450 88,767
Retail Benelux | Germany    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 478 463
Retail Benelux | Poland    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 9 49
Retail Benelux | Spain    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 109 71
Retail Benelux | United Kingdom    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 150 152
Retail Benelux | Luxembourg    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 4,880 4,953
Retail Benelux | France    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 698 643
Retail Benelux | Rest of Europe    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 367 400
Retail Benelux | America    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 201 190
Retail Benelux | Asia    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 69 73
Retail Benelux | Australia    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 14 16
Retail Benelux | Africa    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 24 28
Retail Challengers & Growth Markets    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 257,211 253,391
Retail Challengers & Growth Markets | Natural Resources    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 624 694
Retail Challengers & Growth Markets | Private Individuals    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 193,610 191,556
Retail Challengers & Growth Markets | Central Banks    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 21,740 23,541
Retail Challengers & Growth Markets | Real Estate    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 2,936 3,439
Retail Challengers & Growth Markets | Commercial Banks    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 6,006 5,721
Retail Challengers & Growth Markets | Non-Bank Financial Institutions    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 890 504
Retail Challengers & Growth Markets | Central Governments    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 5,180 3,838
Retail Challengers & Growth Markets | Transportation & Logistics    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 1,679 1,471
Retail Challengers & Growth Markets | Utilities    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 160 150
Retail Challengers & Growth Markets | Food, Beverages & Personal Care    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 2,576 2,585
Retail Challengers & Growth Markets | Services    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 1,276 981
Retail Challengers & Growth Markets | General Industries    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 3,406 3,381
Retail Challengers & Growth Markets | Lower Public Administration    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 10,608 9,725
Retail Challengers & Growth Markets | Other economic sector    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio € 6,519 € 5,805
Retail Challengers & Growth Markets | Investment grade    
Disclosure of credit risk exposure [line items]    
Rating class concentration increase or (decrease) percentage 78.90% 75.20%
Retail Challengers & Growth Markets | Non-performing loans    
Disclosure of credit risk exposure [line items]    
Rating class concentration increase or (decrease) percentage 1.20% 1.00%
Retail Challengers & Growth Markets | 1 (AAA)    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio € 34,373 € 32,492
Retail Challengers & Growth Markets | 2-4 (AA)    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 52,566 40,498
Retail Challengers & Growth Markets | 5-7 (A)    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 88,051 61,422
Retail Challengers & Growth Markets | 8-10 (BBB)    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 27,955 56,046
Retail Challengers & Growth Markets | 11-13 (BB)    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 36,756 46,657
Retail Challengers & Growth Markets | 14-16 (B)    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 12,459 11,662
Retail Challengers & Growth Markets | 17 (CCC)    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 985 1,014
Retail Challengers & Growth Markets | 18 (CC)    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 594 519
Retail Challengers & Growth Markets | 19 (C)    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 437 490
Retail Challengers & Growth Markets | 20-22 (D)    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 3,036 2,592
Retail Challengers & Growth Markets | Netherlands    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 390 254
Retail Challengers & Growth Markets | Belgium    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 1,294 669
Retail Challengers & Growth Markets | Germany    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 128,407 127,764
Retail Challengers & Growth Markets | Poland    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 28,962 26,831
Retail Challengers & Growth Markets | Spain    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 27,049 25,649
Retail Challengers & Growth Markets | United Kingdom    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 125 185
Retail Challengers & Growth Markets | Luxembourg    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 677 639
Retail Challengers & Growth Markets | France    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 2,410 4,448
Retail Challengers & Growth Markets | Rest of Europe    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 20,001 18,750
Retail Challengers & Growth Markets | America    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 1,841 1,795
Retail Challengers & Growth Markets | Asia    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 90 121
Retail Challengers & Growth Markets | Australia    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 45,963 46,281
Retail Challengers & Growth Markets | Africa    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 2 5
Corporate Line    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 5,186 5,997
Corporate Line | Natural Resources    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio
Corporate Line | Private Individuals    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio
Corporate Line | Central Banks    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 2,269 1,495
Corporate Line | Real Estate    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio
Corporate Line | Commercial Banks    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 2,515 2,911
Corporate Line | Non-Bank Financial Institutions    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 286 438
Corporate Line | Central Governments    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 1 1,016
Corporate Line | Transportation & Logistics    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio
Corporate Line | Utilities    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio
Corporate Line | Food, Beverages & Personal Care    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio
Corporate Line | Services    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 24 33
Corporate Line | General Industries    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio
Corporate Line | Lower Public Administration    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio
Corporate Line | Other economic sector    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 92 104
Corporate Line | 1 (AAA)    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 2,284 2,529
Corporate Line | 2-4 (AA)    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 6 12
Corporate Line | 5-7 (A)    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 147 320
Corporate Line | 8-10 (BBB)    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 2,357 2,833
Corporate Line | 11-13 (BB)    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 4
Corporate Line | 14-16 (B)    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio
Corporate Line | 17 (CCC)    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 392 299
Corporate Line | 18 (CC)    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio
Corporate Line | 19 (C)    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio
Corporate Line | 20-22 (D)    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio
Corporate Line | Netherlands    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 2,366 2,898
Corporate Line | Belgium    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 7
Corporate Line | Germany    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 31 63
Corporate Line | Poland    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio
Corporate Line | Spain    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 35 25
Corporate Line | United Kingdom    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 112 107
Corporate Line | Luxembourg    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 15
Corporate Line | France    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 14 1
Corporate Line | Rest of Europe    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 32 24
Corporate Line | America    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 222 358
Corporate Line | Asia    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 2,365 2,504
Corporate Line | Australia    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 2 2
Corporate Line | Africa    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio