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Risk management - Outstandings per line of business (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio € 961,863 € 931,552
Increase (decrease) in portfolio size € 30,300  
Percentage of increase (decrease) in portfolio size 3.20%  
Rating class concentration increase or (decrease) percentage 76.80% 78.10%
Natural Resources    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio € 41,899 € 42,394
Private Individuals    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 379,827 € 361,387
Increase (decrease) in portfolio size € 18,400  
Industry composition percentage 38.80% 39.50%
Central Banks    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio € 77,919 € 94,147
Real Estate    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 53,381 51,515
Commercial Banks    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 51,240 46,040
Increase (decrease) in portfolio size 5,200  
Non-Bank Financial Institutions    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 66,719 57,889
Increase (decrease) in portfolio size 8,800  
Central Governments    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 56,497 52,621
Transportation & Logistics    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 33,536 32,890
Utilities    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 27,713 25,509
Food, Beverages & Personal Care    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 24,246 23,386
Services    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 22,312 22,023
General Industries    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 19,324 21,126
Lower Public Administration    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 26,557 23,704
Other economic sector    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 80,691 76,922
Investment grade    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 750,822 715,602
Non-Investment grade    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio € 191,623 € 197,949
Rating class concentration increase or (decrease) percentage 21.20% 19.90%
Performing restructuring    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio € 6,114 € 6,327
Rating class concentration increase or (decrease) percentage 0.70% 0.60%
Non-performing loans    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio € 13,303 € 11,673
Rating class concentration increase or (decrease) percentage 1.30% 1.40%
1 (AAA)    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio € 84,304 € 89,631
2-4 (AA)    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 135,653 126,694
5-7 (A)    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 242,400 227,543
8-10 (BBB)    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 288,466 271,733
11-13 (BB)    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 148,510 151,756
14-16 (B)    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 38,561 41,565
17 (CCC)    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 4,552 4,628
18 (CC)    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 3,794 4,481
19 (C)    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 2,321 1,848
20-22 (D)    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 13,303 11,673
Netherlands    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 210,913 213,486
Increase (decrease) in portfolio size 8,500  
Netherlands | Natural Resources    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 2,197 2,623
Netherlands | Private Individuals    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 122,914 116,530
Netherlands | Central Banks    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 22,529 31,017
Netherlands | Real Estate    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 16,749 16,907
Netherlands | Commercial Banks    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 1,285 1,217
Netherlands | Non-Bank Financial Institutions    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 2,872 2,573
Netherlands | Central Governments    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 1,416 1,620
Netherlands | Transportation & Logistics    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 4,290 3,860
Netherlands | Utilities    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 1,805 2,419
Netherlands | Food, Beverages & Personal Care    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 7,377 7,138
Netherlands | Services    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 4,919 5,073
Netherlands | General Industries    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 4,568 5,746
Netherlands | Lower Public Administration    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 782 253
Netherlands | Other economic sector    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 17,208 16,510
Netherlands | Investment grade    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 170,093 170,067
Netherlands | Non-Investment grade    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 37,689 40,399
Increase (decrease) in portfolio size (2,700)  
Netherlands | Performing restructuring    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 1,579 1,433
Netherlands | Non-performing loans    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 1,552 1,587
Belgium    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 122,091 115,921
Increase (decrease) in portfolio size 6,200  
Belgium | Natural Resources    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 1,531 1,346
Belgium | Private Individuals    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 45,611 44,637
Belgium | Central Banks    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 10,196 9,756
Belgium | Real Estate    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 13,387 10,986
Belgium | Commercial Banks    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 314 404
Belgium | Non-Bank Financial Institutions    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 1,766 1,457
Belgium | Central Governments    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 11,009 9,046
Belgium | Transportation & Logistics    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 2,076 2,198
Belgium | Utilities    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 1,843 1,634
Belgium | Food, Beverages & Personal Care    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 3,690 3,127
Belgium | Services    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 8,431 8,463
Belgium | General Industries    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 2,690 2,604
Belgium | Lower Public Administration    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 6,824 6,607
Belgium | Other economic sector    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 12,722 13,657
Belgium | Investment grade    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 74,882 71,730
Increase (decrease) in portfolio size 3,200  
Belgium | Non-Investment grade    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 43,059 40,236
Belgium | Performing restructuring    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 1,078 799
Belgium | Non-performing loans    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 3,071 3,156
Germany    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 156,071 155,067
Increase (decrease) in portfolio size 5,000  
Germany | Natural Resources    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 881 1,017
Germany | Private Individuals    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 107,415 103,151
Germany | Central Banks    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 13,966 18,945
Germany | Real Estate    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 1,218 1,111
Germany | Commercial Banks    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 4,129 4,050
Germany | Non-Bank Financial Institutions    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 5,147 5,710
Germany | Central Governments    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 51 699
Germany | Transportation & Logistics    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 1,426 1,277
Germany | Utilities    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 3,920 3,516
Germany | Food, Beverages & Personal Care    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 695 550
Germany | Services    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 1,852 1,725
Germany | General Industries    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 1,059 1,193
Germany | Lower Public Administration    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 7,435 5,349
Germany | Other economic sector    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 6,876 6,774
Germany | Investment grade    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 136,096 136,675
Germany | Non-Investment grade    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 18,238 16,929
Germany | Performing restructuring    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 305 349
Germany | Non-performing loans    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 1,432 1,114
Poland    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 52,136 49,317
Increase (decrease) in portfolio size 2,800  
Poland | Natural Resources    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 778 685
Poland | Private Individuals    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 16,525 14,860
Poland | Central Banks    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 1,729 2,530
Poland | Real Estate    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 2,085 2,184
Poland | Commercial Banks    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 695 601
Poland | Non-Bank Financial Institutions    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 2,874 2,532
Poland | Central Governments    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 9,435 8,614
Poland | Transportation & Logistics    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 1,623 1,598
Poland | Utilities    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 814 792
Poland | Food, Beverages & Personal Care    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 2,215 2,242
Poland | Services    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 1,538 1,325
Poland | General Industries    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 2,824 2,827
Poland | Lower Public Administration    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 608 669
Poland | Other economic sector    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 8,394 7,858
Poland | Investment grade    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 36,029 31,772
Increase (decrease) in portfolio size 4,300  
Poland | Non-Investment grade    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 13,948 15,785
Increase (decrease) in portfolio size (1,800)  
Poland | Performing restructuring    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 701 830
Poland | Non-performing loans    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 1,458 929
Spain    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 40,533 38,240
Spain | Natural Resources    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 152 129
Spain | Private Individuals    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 27,083 25,452
Spain | Central Banks    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 510 489
Spain | Real Estate    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 1,595 1,551
Spain | Commercial Banks    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 376 353
Spain | Non-Bank Financial Institutions    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 249 652
Spain | Central Governments    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 5,308 5,491
Spain | Transportation & Logistics    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 679 658
Spain | Utilities    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 1,971 912
Spain | Food, Beverages & Personal Care    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 351 490
Spain | Services    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 122 71
Spain | General Industries    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 219 333
Spain | Lower Public Administration    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 557 350
Spain | Other economic sector    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 1,361 1,309
Spain | Investment grade    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 32,741 29,583
Increase (decrease) in portfolio size 3,200  
Spain | Non-Investment grade    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 7,126 8,134
Increase (decrease) in portfolio size (1,000)  
Spain | Performing restructuring    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 234 230
Spain | Non-performing loans    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 432 293
United Kingdom    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 28,613 28,974
United Kingdom | Natural Resources    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 3,021 3,789
United Kingdom | Private Individuals    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 122 128
United Kingdom | Central Banks    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 1,935 4,335
United Kingdom | Real Estate    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 552 420
United Kingdom | Commercial Banks    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 4,733 4,488
United Kingdom | Non-Bank Financial Institutions    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 8,479 6,837
United Kingdom | Central Governments    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 48 41
United Kingdom | Transportation & Logistics    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 2,262 2,113
United Kingdom | Utilities    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 2,826 2,723
United Kingdom | Food, Beverages & Personal Care    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 328 540
United Kingdom | Services    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 869 745
United Kingdom | General Industries    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 301 199
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 3,137 2,615
United Kingdom | Investment grade    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 23,844 24,299
United Kingdom | Non-Investment grade    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 4,388 4,508
United Kingdom | Performing restructuring    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 59 2
United Kingdom | Non-performing loans    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 322 165
Luxembourg    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 31,314 29,363
Luxembourg | Natural Resources    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 2,503 2,511
Luxembourg | Private Individuals    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 3,058 3,347
Luxembourg | Central Banks    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 5,737 4,853
Luxembourg | Real Estate    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 3,446 3,563
Luxembourg | Commercial Banks    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 5,268 5,070
Luxembourg | Non-Bank Financial Institutions    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 6,031 4,631
Luxembourg | Central Governments    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 82 79
Luxembourg | Transportation & Logistics    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 828 596
Luxembourg | Utilities    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 395 480
Luxembourg | Food, Beverages & Personal Care    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 1,393 1,505
Luxembourg | Services    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 540 502
Luxembourg | General Industries    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 539 649
Luxembourg | Lower Public Administration    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 246 249
Luxembourg | Other economic sector    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 1,248 1,326
Luxembourg | Investment grade    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 27,235 24,083
Increase (decrease) in portfolio size 3,200  
Luxembourg | Non-Investment grade    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 3,858 5,013
Increase (decrease) in portfolio size (1,200)  
Luxembourg | Performing restructuring    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 56 105
Luxembourg | Non-performing loans    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 166 162
France    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 27,476 24,650
Increase (decrease) in portfolio size 2,800  
France | Natural Resources    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 405 429
France | Private Individuals    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 2,260 2,472
France | Central Banks    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio
France | Real Estate    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 2,713 2,901
France | Commercial Banks    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 5,074 4,155
France | Non-Bank Financial Institutions    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 5,932 4,274
France | Central Governments    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 3,202 2,255
France | Transportation & Logistics    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 765 784
France | Utilities    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 712 619
France | Food, Beverages & Personal Care    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 1,102 1,250
France | Services    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 310 380
France | General Industries    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 484 287
France | Lower Public Administration    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 3,091 3,488
France | Other economic sector    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 1,426 1,356
France | Investment grade    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 21,886 18,692
Increase (decrease) in portfolio size 3,200  
France | Non-Investment grade    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 5,229 5,713
France | Performing restructuring    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 54 122
France | Non-performing loans    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 307 124
Rest of Europe    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 96,076 85,558
Rest of Europe | Natural Resources    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 11,212 10,608
Rest of Europe | Private Individuals    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 16,391 14,179
Rest of Europe | Central Banks    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 10,913 6,166
Rest of Europe | Real Estate    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 3,707 3,492
Rest of Europe | Commercial Banks    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 7,779 6,757
Rest of Europe | Non-Bank Financial Institutions    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 5,174 4,269
Rest of Europe | Central Governments    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 9,203 9,384
Rest of Europe | Transportation & Logistics    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 7,407 8,177
Rest of Europe | Utilities    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 3,951 4,469
Rest of Europe | Food, Beverages & Personal Care    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 3,008 2,455
Rest of Europe | Services    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 1,271 1,052
Rest of Europe | General Industries    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 3,862 3,661
Rest of Europe | Lower Public Administration    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 476 356
Rest of Europe | Other economic sector    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 11,722 10,532
Rest of Europe | Investment grade    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 67,110 56,404
Rest of Europe | Non-Investment grade    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 25,679 25,967
Rest of Europe | Performing restructuring    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 1,369 1,983
Rest of Europe | Non-performing loans    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 1,918 1,205
America    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 89,037 81,114
Increase (decrease) in portfolio size 7,900  
America | Natural Resources    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 8,475 8,237
America | Private Individuals    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 198 149
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 3,220 3,323
America | Commercial Banks    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 10,700 9,833
America | Non-Bank Financial Institutions    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 23,367 20,118
America | Central Governments    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 15,377 13,752
America | Transportation & Logistics    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 3,983 3,511
America | Utilities    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 5,886 4,424
America | Food, Beverages & Personal Care    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 2,498 2,652
America | Services    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 1,265 1,576
America | General Industries    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 2,039 2,848
America | Lower Public Administration    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 1,554 1,550
America | Other economic sector    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 10,475 9,141
America | Investment grade    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 72,686 63,652
America | Non-Investment grade    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 14,763 16,003
America | Performing restructuring    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 443 245
America | Non-performing loans    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 1,145 1,213
Asia    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 47,815 52,374
Increase (decrease) in portfolio size 4,100  
Asia | Natural Resources    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 8,989 9,785
Asia | Private Individuals    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 129 121
Asia | Central Banks    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 9,525 13,668
Asia | Real Estate    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 1,066 1,367
Asia | Commercial Banks    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 9,394 8,182
Asia | Non-Bank Financial Institutions    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 3,518 3,884
Asia | Central Governments    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 288 520
Asia | Transportation & Logistics    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 6,912 7,044
Asia | Utilities    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 1,187 1,306
Asia | Food, Beverages & Personal Care    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 1,168 1,140
Asia | Services    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 516 469
Asia | General Industries    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 708 761
Asia | Lower Public Administration    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 44 7
Asia | Other economic sector    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 4,372 4,120
Asia | Investment grade    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 41,203 44,481
Asia | Non-Investment grade    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 5,859 6,770
Asia | Performing restructuring    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 30 72
Asia | Non-performing loans    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 723 1,051
Australia    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 57,618 55,389
Australia | Natural Resources    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 1,593 941
Australia | Private Individuals    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 38,106 36,340
Australia | Central Banks    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 879 2,379
Australia | Real Estate    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 3,642 3,709
Australia | Commercial Banks    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 1,336 719
Australia | Non-Bank Financial Institutions    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 1,255 950
Australia | Central Governments    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 488 526
Australia | Transportation & Logistics    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 504 456
Australia | Utilities    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 2,253 2,041
Australia | Food, Beverages & Personal Care    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 406 281
Australia | Services    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 680 642
Australia | General Industries    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 23 18
Australia | Lower Public Administration    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 4,941 4,826
Australia | Other economic sector    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 1,513 1,562
Australia | Investment grade    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 46,959 44,139
Australia | Non-Investment grade    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 9,889 10,715
Australia | Performing restructuring    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 203 132
Australia | Non-performing loans    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 568 403
Africa    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 2,170 2,098
Africa | Natural Resources    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 159 295
Africa | Private Individuals    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 16 20
Africa | Central Banks    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 9
Africa | Real Estate    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio
Africa | Commercial Banks    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 157 210
Africa | Non-Bank Financial Institutions    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 55
Africa | Central Governments    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 589 593
Africa | Transportation & Logistics    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 781 618
Africa | Utilities    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 152 173
Africa | Food, Beverages & Personal Care    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 14 18
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 8
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 238 163
Africa | Investment grade    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 59 24
Africa | Non-Investment grade    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 1,898 1,776
Africa | Performing restructuring    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 4 26
Africa | Non-performing loans    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 210 272
Wholesale Banking    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 426,767 415,914
Foreign exchange rate changes, negative impact on portfolio growth amount 8,000  
Wholesale Banking | Natural Resources    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 39,974 40,511
Wholesale Banking | Private Individuals    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 2,116 2,330
Wholesale Banking | Central Banks    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 61,091 70,139
Wholesale Banking | Real Estate    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 24,643 24,904
Wholesale Banking | Commercial Banks    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 40,962 37,342
Wholesale Banking | Non-Bank Financial Institutions    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 64,217 55,313
Wholesale Banking | Central Governments    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 48,389 45,316
Wholesale Banking | Transportation & Logistics    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 27,499 27,106
Wholesale Banking | Utilities    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 25,517 23,324
Wholesale Banking | Food, Beverages & Personal Care    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 13,827 13,503
Wholesale Banking | Services    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 8,844 9,128
Wholesale Banking | General Industries    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 10,512 12,039
Wholesale Banking | Lower Public Administration    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 6,959 6,211
Wholesale Banking | Other economic sector    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio € 52,218 € 48,748
Wholesale Banking | Investment grade    
Disclosure of credit risk exposure [line items]    
Rating class concentration increase or (decrease) percentage 83.70% 81.20%
Wholesale Banking | Non-Investment grade    
Disclosure of credit risk exposure [line items]    
Rating class concentration increase or (decrease) percentage 14.60% 17.10%
Wholesale Banking | Performing restructuring    
Disclosure of credit risk exposure [line items]    
Rating class concentration increase or (decrease) percentage 0.70% 0.60%
Wholesale Banking | Non-performing loans    
Disclosure of credit risk exposure [line items]    
Rating class concentration increase or (decrease) percentage 1.00% 1.20%
Wholesale Banking | 1 (AAA)    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio € 53,363 € 52,665
Wholesale Banking | 2-4 (AA)    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 72,462 67,034
Wholesale Banking | 5-7 (A)    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 101,766 95,320
Wholesale Banking | 8-10 (BBB)    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 129,429 123,081
Wholesale Banking | 11-13 (BB)    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 53,757 57,348
Wholesale Banking | 14-16 (B)    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 7,396 12,234
Wholesale Banking | 17 (CCC)    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 1,037 1,122
Wholesale Banking | 18 (CC)    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 1,792 2,523
Wholesale Banking | 19 (C)    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 560 535
Wholesale Banking | 20-22 (D)    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 5,204 4,051
Wholesale Banking | Netherlands    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 44,421 54,938
Wholesale Banking | Belgium    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 26,506 24,171
Wholesale Banking | Germany    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 27,443 26,152
Wholesale Banking | Poland    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 21,190 20,346
Wholesale Banking | Spain    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 11,990 11,047
Wholesale Banking | United Kingdom    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 28,257 28,587
Wholesale Banking | Luxembourg    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 26,176 23,805
Wholesale Banking | France    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 24,351 21,528
Wholesale Banking | Rest of Europe    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 72,860 65,157
Wholesale Banking | America    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 86,402 78,851
Wholesale Banking | Asia    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 44,136 49,851
Wholesale Banking | Australia    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 10,887 9,409
Wholesale Banking | Africa    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 2,148 2,071
Retail Banking    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 529,317 510,452
Retail Banking | Natural Resources    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 1,925 1,883
Retail Banking | Private Individuals    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 377,712 359,057
Retail Banking | Central Banks    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 15,044 21,740
Retail Banking | Real Estate    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 28,738 26,611
Increase (decrease) in portfolio size 18,900  
Retail Banking | Commercial Banks    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 6,662 6,183
Retail Banking | Non-Bank Financial Institutions    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 2,212 2,290
Retail Banking | Central Governments    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 8,107 7,304
Retail Banking | Transportation & Logistics    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 6,037 5,784
Retail Banking | Utilities    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 2,196 2,184
Retail Banking | Food, Beverages & Personal Care    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 10,419 9,883
Retail Banking | Services    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 13,442 12,872
Retail Banking | General Industries    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 8,812 9,086
Retail Banking | Lower Public Administration    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 19,598 17,493
Retail Banking | Other economic sector    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio € 28,412 € 28,082
Retail Banking | Investment grade    
Disclosure of credit risk exposure [line items]    
Rating class concentration increase or (decrease) percentage 73.30% 73.00%
Retail Banking | Non-Investment grade    
Disclosure of credit risk exposure [line items]    
Rating class concentration increase or (decrease) percentage 24.40% 24.90%
Retail Banking | Performing restructuring    
Disclosure of credit risk exposure [line items]    
Rating class concentration increase or (decrease) percentage 0.70% 0.60%
Retail Banking | Non-performing loans    
Disclosure of credit risk exposure [line items]    
Rating class concentration increase or (decrease) percentage 1.50%  
Retail Banking | 1 (AAA)    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio € 29,151 € 34,683
Retail Banking | 2-4 (AA)    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 63,187 59,655
Retail Banking | 5-7 (A)    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 140,479 132,076
Retail Banking | 8-10 (BBB)    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 155,375 146,295
Retail Banking | 11-13 (BB)    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 94,753 94,408
Retail Banking | 14-16 (B)    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 31,165 29,330
Retail Banking | 17 (CCC)    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 3,345 3,113
Retail Banking | 18 (CC)    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 2,001 1,957
Retail Banking | 19 (C)    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 1,760 1,313
Retail Banking | 20-22 (D)    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 8,100 7,622
Retail Banking | Netherlands    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 164,590 156,182
Retail Banking | Belgium    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 95,584 91,744
Retail Banking | Germany    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 128,598 128,885
Retail Banking | Poland    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 30,946 28,971
Retail Banking | Spain    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 28,507 27,158
Retail Banking | United Kingdom    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 265 275
Retail Banking | Luxembourg    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 5,139 5,557
Retail Banking | France    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 3,122 3,108
Retail Banking | Rest of Europe    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 23,203 20,368
Retail Banking | America    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 2,402 2,042
Retail Banking | Asia    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 215 159
Retail Banking | Australia    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 46,723 45,977
Retail Banking | Africa    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 22 26
Corporate Line [member]    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 5,779 5,186
Corporate Line [member] | Natural Resources    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio
Corporate Line [member] | Private Individuals    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio
Corporate Line [member] | Central Banks    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 1,785 2,269
Corporate Line [member] | Real Estate    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio
Corporate Line [member] | Commercial Banks    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 3,616 2,515
Corporate Line [member] | Non-Bank Financial Institutions    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 290 286
Corporate Line [member] | Central Governments    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 1 1
Corporate Line [member] | Transportation & Logistics    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio
Corporate Line [member] | Utilities    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio
Corporate Line [member] | Food, Beverages & Personal Care    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio
Corporate Line [member] | Services    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 27 24
Corporate Line [member] | General Industries    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio
Corporate Line [member] | Lower Public Administration    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio
Corporate Line [member] | Other economic sector    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 62 92
Corporate Line [member] | 1 (AAA)    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 1,790 2,284
Corporate Line [member] | 2-4 (AA)    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 4 6
Corporate Line [member] | 5-7 (A)    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 154 147
Corporate Line [member] | 8-10 (BBB)    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 3,662 2,357
Corporate Line [member] | 11-13 (BB)    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio
Corporate Line [member] | 14-16 (B)    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio
Corporate Line [member] | 17 (CCC)    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 170 392
Corporate Line [member] | 18 (CC)    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio
Corporate Line [member] | 19 (C)    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio
Corporate Line [member] | 20-22 (D)    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio
Corporate Line [member] | Netherlands    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 1,903 2,366
Corporate Line [member] | Belgium    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 7
Corporate Line [member] | Germany    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 30 31
Corporate Line [member] | Poland    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio
Corporate Line [member] | Spain    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 36 35
Corporate Line [member] | United Kingdom    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 91 112
Corporate Line [member] | Luxembourg    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio
Corporate Line [member] | France    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 3 14
Corporate Line [member] | Rest of Europe    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 14 32
Corporate Line [member] | America    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 232 222
Corporate Line [member] | Asia    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 3,464 2,365
Corporate Line [member] | Australia    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio 8 2
Corporate Line [member] | Africa    
Disclosure of credit risk exposure [line items]    
Outstanding amount in portfolio