v3.26.1
Allowance for credit losses - Development of allowance for credit losses for off balance sheet positions (Detail) - EUR (€)
€ in Millions
 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Development Of Allowance For Credit Losses For Off Balance Sheet Positions [Line Item]    
Balance, beginning of year [1]   € 361
Of which: Financial guarantees [1]   181
Movements including new business [1]   (3)
Transfers due to changes in creditworthiness [1],[2]   0
Changes in models [1]   0
Foreign exchange and other changes [1]   (24)
Balance, end of reporting period [1]   335
Of which: Financial guarantees [1]   181
Provision for credit losses excluding country risk [1],[3]   (3)
Allowance for credit losses    
Development Of Allowance For Credit Losses For Off Balance Sheet Positions [Line Item]    
Balance, beginning of year [4] € 393  
Of which: Financial guarantees [4] 229  
Movements including new business [4] 17  
Transfers due to changes in creditworthiness [4],[5] 0  
Changes in models [4] 0  
Foreign exchange and other changes [4] (30)  
Balance, end of reporting period [4] 380  
Of which: Financial guarantees [4] 229  
Provision for credit losses excluding country risk [4],[6] 17  
Stage 1    
Development Of Allowance For Credit Losses For Off Balance Sheet Positions [Line Item]    
Balance, beginning of year [1]   106
Of which: Financial guarantees [1]   55
Movements including new business [1]   (15)
Transfers due to changes in creditworthiness [1],[2]   3
Changes in models [1]   0
Foreign exchange and other changes [1]   (3)
Balance, end of reporting period [1]   91
Of which: Financial guarantees [1]   55
Provision for credit losses excluding country risk [1],[3]   (12)
Stage 1 | Allowance for credit losses    
Development Of Allowance For Credit Losses For Off Balance Sheet Positions [Line Item]    
Balance, beginning of year [4] 98  
Of which: Financial guarantees [4] 86  
Movements including new business [4] (8)  
Transfers due to changes in creditworthiness [4],[5] 4  
Changes in models [4] 0  
Foreign exchange and other changes [4] (1)  
Balance, end of reporting period [4] 94  
Of which: Financial guarantees [4] 86  
Provision for credit losses excluding country risk [4],[6] (3)  
Stage 2    
Development Of Allowance For Credit Losses For Off Balance Sheet Positions [Line Item]    
Balance, beginning of year [1]   82
Of which: Financial guarantees [1]   42
Movements including new business [1]   9
Transfers due to changes in creditworthiness [1],[2]   (3)
Changes in models [1]   0
Foreign exchange and other changes [1]   (9)
Balance, end of reporting period [1]   78
Of which: Financial guarantees [1]   42
Provision for credit losses excluding country risk [1],[3]   6
Stage 2 | Allowance for credit losses    
Development Of Allowance For Credit Losses For Off Balance Sheet Positions [Line Item]    
Balance, beginning of year [4] 96  
Of which: Financial guarantees [4] 59  
Movements including new business [4] 7  
Transfers due to changes in creditworthiness [4],[5] (6)  
Changes in models [4] 0  
Foreign exchange and other changes [4] (2)  
Balance, end of reporting period [4] 96  
Of which: Financial guarantees [4] 59  
Provision for credit losses excluding country risk [4],[6] 1  
Stage 3    
Development Of Allowance For Credit Losses For Off Balance Sheet Positions [Line Item]    
Balance, beginning of year [1]   173
Of which: Financial guarantees [1]   84
Movements including new business [1]   1
Transfers due to changes in creditworthiness [1],[2]   0
Changes in models [1]   0
Foreign exchange and other changes [1]   (12)
Balance, end of reporting period [1]   162
Of which: Financial guarantees [1]   84
Provision for credit losses excluding country risk [1],[3]   1
Stage 3 | Allowance for credit losses    
Development Of Allowance For Credit Losses For Off Balance Sheet Positions [Line Item]    
Balance, beginning of year [4] 196  
Of which: Financial guarantees [4] 84  
Movements including new business [4] 16  
Transfers due to changes in creditworthiness [4],[5] 2  
Changes in models [4] 0  
Foreign exchange and other changes [4] (25)  
Balance, end of reporting period [4] 189  
Of which: Financial guarantees [4] 84  
Provision for credit losses excluding country risk [4],[6] 18  
Stage 3 POCI    
Development Of Allowance For Credit Losses For Off Balance Sheet Positions [Line Item]    
Balance, beginning of year [1]   0
Of which: Financial guarantees [1]   0
Movements including new business [1]   3
Changes in models [1]   0
Foreign exchange and other changes [1]   0
Balance, end of reporting period [1]   3
Of which: Financial guarantees [1]   0
Provision for credit losses excluding country risk [1],[3]   € 3
Stage 3 POCI | Allowance for credit losses    
Development Of Allowance For Credit Losses For Off Balance Sheet Positions [Line Item]    
Balance, beginning of year [4] 2  
Of which: Financial guarantees [4] 0  
Movements including new business [4] 1  
Changes in models [4] 0  
Foreign exchange and other changes [4] (2)  
Balance, end of reporting period [4] 1  
Of which: Financial guarantees [4] 0  
Provision for credit losses excluding country risk [4],[6] € 1  
[1] Allowance for credit losses does not include allowance for country risk amounting to € 10 million as of June 30, 2025
[2] Transfers due to changes in creditworthiness shows the credit loss allowance movements due to stage transfer prior to expected credit loss remeasurement
[3] The above table breaks down the impact on provision for credit losses from movements in financial assets including new business, transfers due to changes in
creditworthiness and changes in models
[4] 3Allowance for credit losses does not include allowance for country risk amounting to € 13 million as of June 30, 2026
[5] Transfers due to changes in creditworthiness shows the credit loss allowance movements due to stage transfer prior to expected credit loss remeasurement
[6] The above table breaks down the impact on provision for credit losses from movements in financial assets including new business, transfers due to changes in
creditworthiness and changes in models