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Risk management - Outstandings by economic sectors and geographical area (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Mar. 04, 2022
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio € 931,552 € 938,061  
Increase (decrease) in portfolio size (6,500)    
Investment grade      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio € 715,602 714,997  
Percentage of total outstandings 99.00%    
Non-Investment grade      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio € 197,949 203,786  
Performing restructuring      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 6,327 7,569  
Non-performing loans      
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  
Overall portfolio percent 21.80% 22.00%  
Increase (decrease) in portfolio size € (4,200)    
Netherlands | Private Individuals      
Disclosure of credit risk exposure [line items]      
Percentage of total outstandings 63.90% 62.50%  
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  
Percentage of total outstandings 0.70%    
Netherlands | Non-performing loans      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio € 1,587 € 1,743  
Percentage of total outstandings 0.70% 0.80%  
Netherlands | Investment grade and non-investment grade      
Disclosure of credit risk exposure [line items]      
Percentage of total outstandings 98.60% 98.50%  
Belgium      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio € 115,921 € 116,580  
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  
Percentage of total outstandings 0.70% 0.80%  
Belgium | Non-performing loans      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio € 3,156 € 3,316  
Percentage of total outstandings 2.70% 2.80%  
Belgium | Investment grade and non-investment grade      
Disclosure of credit risk exposure [line items]      
Percentage of total outstandings 96.60% 96.30%  
Germany      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio € 155,067 € 152,730  
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 | 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  
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 | 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  
Credit grade percentage 0.60% 1.20%  
Luxembourg      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio € 29,363 € 31,720  
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 | 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 | 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 | 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 | 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  
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 | 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  
Credit grade percentage 13.00% 3.00%  
Italy      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio € 18,700    
Romania      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 11,500    
Switzerland      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 11,200    
Türkiye      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 7,200    
Russia      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio € 4,700 € 300 € 6,700
Europe | Performing restructuring      
Disclosure of credit risk exposure [line items]      
Credit grade percentage 2.30% 3.00%  
USA | Non-performing loans      
Disclosure of credit risk exposure [line items]      
Credit grade percentage 1.50% 0.80%  
Asia | Non-performing loans      
Disclosure of credit risk exposure [line items]      
Credit grade percentage 2.00% 2.70%  
Private Individuals      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio € 361,387 € 354,831  
Private Individuals | Netherlands      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 116,530 114,625  
Private Individuals | Belgium      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 44,637 44,193  
Private Individuals | Germany      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 103,151 101,529  
Private Individuals | Poland      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 14,860 13,767  
Private Individuals | Spain      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 25,452 24,865  
Private Individuals | United Kingdom      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 128 138  
Private Individuals | Luxembourg      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 3,347 3,486  
Private Individuals | France      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 2,472 2,731  
Private Individuals | Rest of Europe      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 14,179 13,654  
Private Individuals | America      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 149 161  
Private Individuals | Asia      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 121 131  
Private Individuals | Australia      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 36,340 35,528  
Private Individuals | Africa      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 20 24  
Central Banks      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 94,147 105,043  
Central Banks | Netherlands      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 31,017 35,202  
Central Banks | Belgium      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 9,756 14,338  
Central Banks | Germany      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 18,945 21,041  
Central Banks | Poland      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 2,530 1,060  
Central Banks | Spain      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 489 347  
Central Banks | United Kingdom      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 4,335 427  
Central Banks | Luxembourg      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 4,853 6,820  
Central Banks | France      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 35  
Central Banks | Rest of Europe      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 6,166 18,092  
Central Banks | America      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio  
Central Banks | Asia      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 13,668 4,962  
Central Banks | Australia      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 2,379 2,695  
Central Banks | Africa      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 9 24  
Natural Resources      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 42,394 46,549  
Natural Resources | Netherlands      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 2,623 3,084  
Natural Resources | Belgium      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 1,346 1,356  
Natural Resources | Germany      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 1,017 809  
Natural Resources | Poland      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 685 746  
Natural Resources | Spain      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 129 169  
Natural Resources | United Kingdom      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 3,789 4,442  
Natural Resources | Luxembourg      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 2,511 2,764  
Natural Resources | France      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 429 470  
Natural Resources | Rest of Europe      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 10,608 12,154  
Natural Resources | America      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 8,237 8,771  
Natural Resources | Asia      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 9,785 10,398  
Natural Resources | Australia      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 941 1,028  
Natural Resources | Africa      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 295 361  
Real Estate      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 51,515 52,513  
Real Estate | Netherlands      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 16,907 17,586  
Real Estate | Belgium      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 10,986 10,112  
Real Estate | Germany      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 1,111 1,388  
Real Estate | Poland      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 2,184 2,374  
Real Estate | Spain      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 1,551 1,391  
Real Estate | United Kingdom      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 420 413  
Real Estate | Luxembourg      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 3,563 3,797  
Real Estate | France      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 2,901 3,155  
Real Estate | Rest of Europe      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 3,492 3,378  
Real Estate | America      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 3,323 3,474  
Real Estate | Asia      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 1,367 1,180  
Real Estate | Australia      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 3,709 4,263  
Real Estate | Africa      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 2  
Commercial Banks      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 46,040 50,862  
Commercial Banks | Netherlands      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 1,217 1,358  
Commercial Banks | Belgium      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 404 265  
Commercial Banks | Germany      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 4,050 3,974  
Commercial Banks | Poland      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 601 551  
Commercial Banks | Spain      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 353 402  
Commercial Banks | United Kingdom      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 4,488 4,933  
Commercial Banks | Luxembourg      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 5,070 4,480  
Commercial Banks | France      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 4,155 4,371  
Commercial Banks | Rest of Europe      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 6,757 6,368  
Commercial Banks | America      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 9,833 9,945  
Commercial Banks | Asia      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 8,182 12,041  
Commercial Banks | Australia      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 719 1,765  
Commercial Banks | Africa      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 210 409  
Non-Bank Financial Institutions      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 57,889 56,594  
Non-Bank Financial Institutions | Netherlands      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 2,573 2,710  
Non-Bank Financial Institutions | Belgium      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 1,457 1,041  
Non-Bank Financial Institutions | Germany      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 5,710 5,054  
Non-Bank Financial Institutions | Poland      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 2,532 2,299  
Non-Bank Financial Institutions | Spain      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 652 99  
Non-Bank Financial Institutions | United Kingdom      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 6,837 8,229  
Non-Bank Financial Institutions | Luxembourg      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 4,631 4,489  
Non-Bank Financial Institutions | France      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 4,274 3,220  
Non-Bank Financial Institutions | Rest of Europe      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 4,269 4,495  
Non-Bank Financial Institutions | America      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 20,118 19,971  
Non-Bank Financial Institutions | Asia      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 3,884 4,091  
Non-Bank Financial Institutions | Australia      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 950 896  
Non-Bank Financial Institutions | Africa      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio  
Central Governments      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 52,621 49,356  
Central Governments | Netherlands      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 1,620 3,342  
Central Governments | Belgium      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 9,046 7,716  
Central Governments | Germany      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 699 1,179  
Central Governments | Poland      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 8,614 6,578  
Central Governments | Spain      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 5,491 4,578  
Central Governments | United Kingdom      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 41 46  
Central Governments | Luxembourg      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 79 175  
Central Governments | France      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 2,255 1,797  
Central Governments | Rest of Europe      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 9,384 8,444  
Central Governments | America      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 13,752 13,979  
Central Governments | Asia      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 520 333  
Central Governments | Australia      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 526 636  
Central Governments | Africa      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 593 551  
Transportation & Logistics      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 32,890 30,982  
Transportation & Logistics | Netherlands      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 3,860 3,967  
Transportation & Logistics | Belgium      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 2,198 2,183  
Transportation & Logistics | Germany      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 1,277 608  
Transportation & Logistics | Poland      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 1,598 1,300  
Transportation & Logistics | Spain      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 658 690  
Transportation & Logistics | United Kingdom      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 2,113 1,787  
Transportation & Logistics | Luxembourg      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 596 583  
Transportation & Logistics | France      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 784 733  
Transportation & Logistics | Rest of Europe      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 8,177 7,808  
Transportation & Logistics | America      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 3,511 3,378  
Transportation & Logistics | Asia      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 7,044 6,806  
Transportation & Logistics | Australia      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 456 531  
Transportation & Logistics | Africa      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 618 608  
Utilities      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 25,509 24,698  
Utilities | Netherlands      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 2,419 1,551  
Utilities | Belgium      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 1,634 1,630  
Utilities | Germany      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 3,516 2,814  
Utilities | Poland      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 792 679  
Utilities | Spain      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 912 1,227  
Utilities | United Kingdom      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 2,723 2,953  
Utilities | Luxembourg      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 480 572  
Utilities | France      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 619 980  
Utilities | Rest of Europe      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 4,469 4,302  
Utilities | America      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 4,424 4,347  
Utilities | Asia      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 1,306 1,545  
Utilities | Australia      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 2,041 1,897  
Utilities | Africa      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 173 200  
Food, Beverages & Personal Care      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 23,386 23,623  
Food, Beverages & Personal Care | Netherlands      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 7,138 7,249  
Food, Beverages & Personal Care | Belgium      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 3,127 3,002  
Food, Beverages & Personal Care | Germany      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 550 573  
Food, Beverages & Personal Care | Poland      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 2,242 2,334  
Food, Beverages & Personal Care | Spain      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 490 475  
Food, Beverages & Personal Care | United Kingdom      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 540 739  
Food, Beverages & Personal Care | Luxembourg      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 1,505 1,667  
Food, Beverages & Personal Care | France      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 1,250 469  
Food, Beverages & Personal Care | Rest of Europe      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 2,455 2,668  
Food, Beverages & Personal Care | America      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 2,652 3,245  
Food, Beverages & Personal Care | Asia      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 1,140 942  
Food, Beverages & Personal Care | Australia      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 281 248  
Food, Beverages & Personal Care | Africa      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 18 13  
Services      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 22,023 22,546  
Services | Netherlands      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 5,073 4,819  
Services | Belgium      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 8,463 8,816  
Services | Germany      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 1,725 1,254  
Services | Poland      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 1,325 1,101  
Services | Spain      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 71 67  
Services | United Kingdom      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 745 685  
Services | Luxembourg      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 502 808  
Services | France      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 380 1,066  
Services | Rest of Europe      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 1,052 1,120  
Services | America      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 1,576 1,821  
Services | Asia      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 469 357  
Services | Australia      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 642 632  
Services | Africa      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio  
General Industries      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 21,126 20,865  
General Industries | Netherlands      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 5,746 5,430  
General Industries | Belgium      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 2,604 2,689  
General Industries | Germany      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 1,193 1,007  
General Industries | Poland      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 2,827 2,849  
General Industries | Spain      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 333 311  
General Industries | United Kingdom      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 199 330  
General Industries | Luxembourg      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 649 604  
General Industries | France      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 287 245  
General Industries | Rest of Europe      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 3,661 3,152  
General Industries | America      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 2,848 2,926  
General Industries | Asia      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 761 1,311  
General Industries | Australia      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 18 9  
General Industries | Africa      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio  
Lower Public Administration      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 23,704 21,666  
Lower Public Administration | Netherlands      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 253 272  
Lower Public Administration | Belgium      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 6,607 5,638  
Lower Public Administration | Germany      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 5,349 5,197  
Lower Public Administration | Poland      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 669 644  
Lower Public Administration | Spain      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 350 200  
Lower Public Administration | United Kingdom      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio  
Lower Public Administration | Luxembourg      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 249 313  
Lower Public Administration | France      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 3,488 3,126  
Lower Public Administration | Rest of Europe      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 356 402  
Lower Public Administration | America      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 1,550 1,310  
Lower Public Administration | Asia      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 7  
Lower Public Administration | Australia      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 4,826 4,564  
Lower Public Administration | Africa      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio  
Other      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 76,922 77,932  
Other | Netherlands      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 16,510 17,353  
Other | Belgium      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 13,657 13,602  
Other | Germany      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 6,774 6,302  
Other | Poland      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 7,858 6,946  
Other | Spain      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 1,309 1,416  
Other | United Kingdom      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 2,615 3,058  
Other | Luxembourg      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 1,326 1,164  
Other | France      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 1,356 1,179  
Other | Rest of Europe      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 10,532 10,952  
Other | America      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 9,141 9,457  
Other | Asia      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 4,120 4,891  
Other | Australia      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio 1,562 1,424  
Other | Africa      
Disclosure of credit risk exposure [line items]      
Outstanding amount in portfolio € 163 € 188