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Risk management - Credit Risk: Additional information (Details)
€ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2024
EUR (€)
Dec. 31, 2023
EUR (€)
Dec. 31, 2022
EUR (€)
Disclosure of credit risk exposure [line items]      
Economic sector based adjustments € 16 € 36  
Inflation and Interest rate increases adjustments 233 351  
Mortgage portfolio adjustments 128 126  
Total management adjustments 415 577  
Unweighted ECL for all collective provisioned clients in upside scenario 2,623    
Unweighted ECL for all collective provisioned clients in baseline scenario 2,895    
Unweighted ECL for all collective provisioned clients in down scenario 3,579    
Upside Scenario      
Disclosure of credit risk exposure [line items]      
Hypothetical collective-assessment ECLs 1,034    
Downside Scenario      
Disclosure of credit risk exposure [line items]      
Hypothetical collective-assessment ECLs 2,078    
Excluding all managment adjustments      
Disclosure of credit risk exposure [line items]      
Total model ECL 2,977    
Total ECL collective-assessment for performing assets 1,343 1,412  
Netherlands      
Disclosure of credit risk exposure [line items]      
Total management adjustments 118 115  
Germany      
Disclosure of credit risk exposure [line items]      
Mortgage portfolio adjustments 10 11  
Retail banking      
Disclosure of credit risk exposure [line items]      
Inflation and Interest rate increases adjustments 104 138  
Wholesale Banking      
Disclosure of credit risk exposure [line items]      
Inflation and Interest rate increases adjustments € 129 213  
Lifetime ECL not credit impaired (Stage 2) | Upside Scenario      
Disclosure of credit risk exposure [line items]      
Percentage point variance on ECL (0.005)    
Lifetime ECL not credit impaired (Stage 2) | Downside Scenario      
Disclosure of credit risk exposure [line items]      
Percentage point variance on ECL 0.027    
Gross carrying amount | Consumer Lending      
Disclosure of credit risk exposure [line items]      
Percentage of financial assets 35.00%    
Gross carrying amount | Business Lending      
Disclosure of credit risk exposure [line items]      
Percentage of financial assets 65.00%    
Gross carrying amount | Loans      
Disclosure of credit risk exposure [line items]      
Financial assets € 1,057,950 1,025,043 € 967,655
Additions 106,366 195,775  
Impairments 379 790  
Gross carrying amount | Loans | Adjustment      
Disclosure of credit risk exposure [line items]      
Financial assets     41,939
Gross carrying amount | Loans | Adjusted balance      
Disclosure of credit risk exposure [line items]      
Financial assets     1,009,595
Gross carrying amount | IFRS 9      
Disclosure of credit risk exposure [line items]      
Financial assets € 1,057,950 € 1,025,043  
Gross carrying amount | 12-month ECL (Stage 1)      
Disclosure of credit risk exposure [line items]      
Percentage of financial assets 92.20% 91.50%  
Gross carrying amount | 12-month ECL (Stage 1) | Loans      
Disclosure of credit risk exposure [line items]      
Financial assets € 975,522 € 937,633 885,222
Additions 106,366 195,775  
Impairments   3  
Gross carrying amount | 12-month ECL (Stage 1) | Loans | Adjustment      
Disclosure of credit risk exposure [line items]      
Financial assets     37,078
Gross carrying amount | 12-month ECL (Stage 1) | Loans | Adjusted balance      
Disclosure of credit risk exposure [line items]      
Financial assets     922,300
Gross carrying amount | 12-month ECL (Stage 1) | IFRS 9      
Disclosure of credit risk exposure [line items]      
Financial assets € 975,522 € 937,633  
Gross carrying amount | Lifetime ECL not credit impaired (Stage 2)      
Disclosure of credit risk exposure [line items]      
Percentage of financial assets 6.50% 7.40%  
Gross carrying amount | Lifetime ECL not credit impaired (Stage 2) | Loans      
Disclosure of credit risk exposure [line items]      
Financial assets € 68,969 € 75,454 70,725
Impairments    
Gross carrying amount | Lifetime ECL not credit impaired (Stage 2) | Loans | Adjustment      
Disclosure of credit risk exposure [line items]      
Financial assets     4,704
Gross carrying amount | Lifetime ECL not credit impaired (Stage 2) | Loans | Adjusted balance      
Disclosure of credit risk exposure [line items]      
Financial assets     75,429
Gross carrying amount | Lifetime ECL not credit impaired (Stage 2) | IFRS 9      
Disclosure of credit risk exposure [line items]      
Increase (decrease) in financial assets (6,500)    
Financial assets € 68,969 € 75,454  
Gross carrying amount | Lifetime ECL credit impaired (Stage 3)      
Disclosure of credit risk exposure [line items]      
Percentage of financial assets 1.30% 1.20%  
Gross carrying amount | Lifetime ECL credit impaired (Stage 3) | Loans      
Disclosure of credit risk exposure [line items]      
Financial assets € 13,459 € 11,956 11,708
Impairments 379 787  
Gross carrying amount | Lifetime ECL credit impaired (Stage 3) | Loans | Adjustment      
Disclosure of credit risk exposure [line items]      
Financial assets     158
Gross carrying amount | Lifetime ECL credit impaired (Stage 3) | Loans | Adjusted balance      
Disclosure of credit risk exposure [line items]      
Financial assets     11,866
Gross carrying amount | Lifetime ECL credit impaired (Stage 3) | IFRS 9      
Disclosure of credit risk exposure [line items]      
Increase (decrease) in financial assets 1,500    
Financial assets 13,459 11,956  
Decrease through derecognition and repayments financial assets 1,200    
Impairments 400    
Gross carrying amount | Lifetime ECL credit impaired (Stage 3) | IFRS 9 | Non-performing      
Disclosure of credit risk exposure [line items]      
Additions 3,100    
Accumulated impairment      
Disclosure of credit risk exposure [line items]      
Increase (decrease) in financial assets (559) (520)  
Financial assets (6,117) (5,839)  
Accumulated impairment | Loans      
Disclosure of credit risk exposure [line items]      
Increase (decrease) in financial assets (553) (452)  
Financial assets (6,117) (5,839) (6,101)
Additions (118) (204)  
Impairments 379 790  
Accumulated impairment | Loans | Adjustment      
Disclosure of credit risk exposure [line items]      
Financial assets     (95)
Accumulated impairment | Loans | Adjusted balance      
Disclosure of credit risk exposure [line items]      
Financial assets     (6,196)
Accumulated impairment | IFRS 9      
Disclosure of credit risk exposure [line items]      
Financial assets (6,117) (5,839)  
Accumulated impairment | 12-month ECL (Stage 1) | Loans      
Disclosure of credit risk exposure [line items]      
Increase (decrease) in financial assets 19 58  
Financial assets (494) (517) (581)
Additions (117) (204)  
Impairments   3  
Accumulated impairment | 12-month ECL (Stage 1) | Loans | Adjustment      
Disclosure of credit risk exposure [line items]      
Financial assets     (9)
Accumulated impairment | 12-month ECL (Stage 1) | Loans | Adjusted balance      
Disclosure of credit risk exposure [line items]      
Financial assets     (590)
Accumulated impairment | 12-month ECL (Stage 1) | IFRS 9      
Disclosure of credit risk exposure [line items]      
Financial assets (494) (517)  
Accumulated impairment | Lifetime ECL not credit impaired (Stage 2) | Loans      
Disclosure of credit risk exposure [line items]      
Increase (decrease) in financial assets 247 204  
Financial assets (1,190) (1,435) (1,679)
Impairments    
Accumulated impairment | Lifetime ECL not credit impaired (Stage 2) | Loans | Adjustment      
Disclosure of credit risk exposure [line items]      
Financial assets     (13)
Accumulated impairment | Lifetime ECL not credit impaired (Stage 2) | Loans | Adjusted balance      
Disclosure of credit risk exposure [line items]      
Financial assets     (1,692)
Accumulated impairment | Lifetime ECL not credit impaired (Stage 2) | IFRS 9      
Disclosure of credit risk exposure [line items]      
Increase (decrease) in financial assets 200    
Financial assets (1,190) (1,435)  
Accumulated impairment | Lifetime ECL credit impaired (Stage 3) | Loans      
Disclosure of credit risk exposure [line items]      
Increase (decrease) in financial assets (819) (714)  
Financial assets (4,432) (3,887) (3,841)
Impairments 379 787  
Accumulated impairment | Lifetime ECL credit impaired (Stage 3) | Loans | Adjustment      
Disclosure of credit risk exposure [line items]      
Financial assets     (73)
Accumulated impairment | Lifetime ECL credit impaired (Stage 3) | Loans | Adjusted balance      
Disclosure of credit risk exposure [line items]      
Financial assets     € (3,914)
Accumulated impairment | Lifetime ECL credit impaired (Stage 3) | IFRS 9      
Disclosure of credit risk exposure [line items]      
Increase (decrease) in financial assets (500)    
Financial assets € (4,432) € (3,887)