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Risk management - Changes in gross carrying amounts and loan loss provisions (Details) - EUR (€)
€ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2024
Dec. 31, 2023
Poland    
Disclosure of credit risk exposure [line items]    
Increase in loan loss provisions € 6  
Gross carrying amount | Purchased credit impaired | Stage 3: lifetime expected credit losses    
Disclosure of credit risk exposure [line items]    
Opening balance as at 1 January (11)  
Closing balance (7) € (11)
Provisions    
Disclosure of credit risk exposure [line items]    
Opening balance as at 1 January (5,839)  
Increase in loan loss provisions 559 520
Closing balance (6,117) (5,839)
Provisions | IFRS-9 eligible financial assets    
Disclosure of credit risk exposure [line items]    
Disposals and redemptions   (553)
Increase in loan loss provisions   483
Provisions | Non-credit replacement guarantees    
Disclosure of credit risk exposure [line items]    
Increase in loan loss provisions   (31)
Provisions | Modification gains and losses on restructured financial assets    
Disclosure of credit risk exposure [line items]    
Increase in loan loss provisions   68
Loans | Gross carrying amount    
Disclosure of credit risk exposure [line items]    
Opening balance as at 1 January 1,025,043 967,655
New financial assets originated or purchased (106,366) (195,775)
Disposals and redemptions (66,495) (137,705)
Net drawdowns and repayments (6,585)  
Changes in models/risk parameters   41,511
Write-offs (379) (790)
Disposals3   (321)
Closing balance 1,057,950 1,025,043
Loans | Gross carrying amount | Adjustment    
Disclosure of credit risk exposure [line items]    
Opening balance as at 1 January   41,939
Loans | Gross carrying amount | Adjusted balance    
Disclosure of credit risk exposure [line items]    
Opening balance as at 1 January   1,009,595
Loans | Gross carrying amount | 12-month ECL (Stage 1)    
Disclosure of credit risk exposure [line items]    
Opening balance as at 1 January 937,633 885,222
New financial assets originated or purchased (106,366) (195,775)
Disposals and redemptions (58,961) (121,991)
Net drawdowns and repayments (2,505)  
Changes in models/risk parameters   38,758
Write-offs   (3)
Closing balance 975,522 937,633
Loans | Gross carrying amount | 12-month ECL (Stage 1) | Adjustment    
Disclosure of credit risk exposure [line items]    
Opening balance as at 1 January   37,078
Loans | Gross carrying amount | 12-month ECL (Stage 1) | Adjusted balance    
Disclosure of credit risk exposure [line items]    
Opening balance as at 1 January   922,300
Loans | Gross carrying amount | 12-month ECL (Stage 1) | 12-month expected credit losses    
Disclosure of credit risk exposure [line items]    
Transfers and reclassifications  (16,436) (11,832)
Loans | Gross carrying amount | 12-month ECL (Stage 1) | Lifetime expected credit losses    
Disclosure of credit risk exposure [line items]    
Transfers and reclassifications    2,053
Loans | Gross carrying amount | 12-month ECL (Stage 1) | Not credit-impaired | Lifetime expected credit losses    
Disclosure of credit risk exposure [line items]    
Transfers and reclassifications  21,990 29,470
Loans | Gross carrying amount | 12-month ECL (Stage 1) | Credit impaired | Lifetime expected credit losses    
Disclosure of credit risk exposure [line items]    
Transfers and reclassifications  1,457  
Loans | Gross carrying amount | Lifetime ECL not credit impaired (Stage 2)    
Disclosure of credit risk exposure [line items]    
Opening balance as at 1 January 75,454 70,725
Disposals and redemptions (6,485) (14,239)
Net drawdowns and repayments (3,893)  
Changes in models/risk parameters   2,525
Write-offs  
Disposals3   (38)
Closing balance 68,969 75,454
Loans | Gross carrying amount | Lifetime ECL not credit impaired (Stage 2) | Adjustment    
Disclosure of credit risk exposure [line items]    
Opening balance as at 1 January   4,704
Loans | Gross carrying amount | Lifetime ECL not credit impaired (Stage 2) | Adjusted balance    
Disclosure of credit risk exposure [line items]    
Opening balance as at 1 January   75,429
Loans | Gross carrying amount | Lifetime ECL not credit impaired (Stage 2) | 12-month expected credit losses    
Disclosure of credit risk exposure [line items]    
Transfers and reclassifications  16,237 11,583
Loans | Gross carrying amount | Lifetime ECL not credit impaired (Stage 2) | Lifetime expected credit losses    
Disclosure of credit risk exposure [line items]    
Transfers and reclassifications    1,775
Loans | Gross carrying amount | Lifetime ECL not credit impaired (Stage 2) | Not credit-impaired | Lifetime expected credit losses    
Disclosure of credit risk exposure [line items]    
Transfers and reclassifications  (22,489) (30,185)
Loans | Gross carrying amount | Lifetime ECL not credit impaired (Stage 2) | Credit impaired | Lifetime expected credit losses    
Disclosure of credit risk exposure [line items]    
Transfers and reclassifications  2,360  
Loans | Gross carrying amount | Lifetime ECL credit impaired (Stage 3)    
Disclosure of credit risk exposure [line items]    
Opening balance as at 1 January 11,956 11,708
Disposals and redemptions (1,048) (1,475)
Net drawdowns and repayments (188)  
Changes in models/risk parameters   229
Write-offs (379) (787)
Disposals3   (283)
Closing balance 13,459 11,956
Loans | Gross carrying amount | Lifetime ECL credit impaired (Stage 3) | Adjustment    
Disclosure of credit risk exposure [line items]    
Opening balance as at 1 January   158
Loans | Gross carrying amount | Lifetime ECL credit impaired (Stage 3) | Adjusted balance    
Disclosure of credit risk exposure [line items]    
Opening balance as at 1 January   11,866
Loans | Gross carrying amount | Lifetime ECL credit impaired (Stage 3) | 12-month expected credit losses    
Disclosure of credit risk exposure [line items]    
Transfers and reclassifications  199 249
Loans | Gross carrying amount | Lifetime ECL credit impaired (Stage 3) | Lifetime expected credit losses    
Disclosure of credit risk exposure [line items]    
Transfers and reclassifications    (3,828)
Loans | Gross carrying amount | Lifetime ECL credit impaired (Stage 3) | Not credit-impaired | Lifetime expected credit losses    
Disclosure of credit risk exposure [line items]    
Transfers and reclassifications  498 716
Loans | Gross carrying amount | Lifetime ECL credit impaired (Stage 3) | Credit impaired | Lifetime expected credit losses    
Disclosure of credit risk exposure [line items]    
Transfers and reclassifications  (3,817)  
Loans | Provisions    
Disclosure of credit risk exposure [line items]    
Opening balance as at 1 January (5,839) (6,101)
Net remeasurement of loan loss provisions (163) (184)
New financial assets originated or purchased 118 204
Disposals and redemptions (232)  
Net drawdowns and repayments   102
Changes in models/risk parameters (19)  
Increase in loan loss provisions 553 452
Write-offs (379) (790)
Disposals3 (3) (321)
Recoveries of amounts previously written off 23 71
Foreign exchange and other movements 85 231
Closing balance (6,117) (5,839)
Loans | Provisions | Adjustment    
Disclosure of credit risk exposure [line items]    
Opening balance as at 1 January   (95)
Loans | Provisions | Adjusted balance    
Disclosure of credit risk exposure [line items]    
Opening balance as at 1 January   (6,196)
Loans | Provisions | 12-month expected credit losses    
Disclosure of credit risk exposure [line items]    
Transfers and reclassifications  (162) (247)
Loans | Provisions | Lifetime expected credit losses    
Disclosure of credit risk exposure [line items]    
Transfers and reclassifications    853
Loans | Provisions | Not credit-impaired | Lifetime expected credit losses    
Disclosure of credit risk exposure [line items]    
Transfers and reclassifications  194 277
Loans | Provisions | Credit impaired | Lifetime expected credit losses    
Disclosure of credit risk exposure [line items]    
Transfers and reclassifications  817  
Loans | Provisions | 12-month ECL (Stage 1)    
Disclosure of credit risk exposure [line items]    
Opening balance as at 1 January (517) (581)
Net remeasurement of loan loss provisions (72) (149)
New financial assets originated or purchased 117 204
Disposals and redemptions (45) (72)
Net drawdowns and repayments   8
Changes in models/risk parameters (2)  
Increase in loan loss provisions (19) (58)
Write-offs   (3)
Disposals3 (1)  
Foreign exchange and other movements (3) (12)
Closing balance (494) (517)
Loans | Provisions | 12-month ECL (Stage 1) | Adjustment    
Disclosure of credit risk exposure [line items]    
Opening balance as at 1 January   (9)
Loans | Provisions | 12-month ECL (Stage 1) | Adjusted balance    
Disclosure of credit risk exposure [line items]    
Opening balance as at 1 January   (590)
Loans | Provisions | 12-month ECL (Stage 1) | 12-month expected credit losses    
Disclosure of credit risk exposure [line items]    
Transfers and reclassifications  21 28
Loans | Provisions | 12-month ECL (Stage 1) | Lifetime expected credit losses    
Disclosure of credit risk exposure [line items]    
Transfers and reclassifications    (10)
Loans | Provisions | 12-month ECL (Stage 1) | Not credit-impaired | Lifetime expected credit losses    
Disclosure of credit risk exposure [line items]    
Transfers and reclassifications  (32) (67)
Loans | Provisions | 12-month ECL (Stage 1) | Credit impaired | Lifetime expected credit losses    
Disclosure of credit risk exposure [line items]    
Transfers and reclassifications  (6)  
Loans | Provisions | Lifetime ECL not credit impaired (Stage 2)    
Disclosure of credit risk exposure [line items]    
Opening balance as at 1 January (1,435) (1,679)
Net remeasurement of loan loss provisions (88) (94)
Disposals and redemptions (93) (215)
Net drawdowns and repayments   10
Changes in models/risk parameters (15)  
Increase in loan loss provisions (247) (204)
Write-offs  
Disposals3 (2) (38)
Foreign exchange and other movements 5 (15)
Closing balance (1,190) (1,435)
Loans | Provisions | Lifetime ECL not credit impaired (Stage 2) | Adjustment    
Disclosure of credit risk exposure [line items]    
Opening balance as at 1 January   (13)
Loans | Provisions | Lifetime ECL not credit impaired (Stage 2) | Adjusted balance    
Disclosure of credit risk exposure [line items]    
Opening balance as at 1 January   (1,692)
Loans | Provisions | Lifetime ECL not credit impaired (Stage 2) | 12-month expected credit losses    
Disclosure of credit risk exposure [line items]    
Transfers and reclassifications  (164) (239)
Loans | Provisions | Lifetime ECL not credit impaired (Stage 2) | Lifetime expected credit losses    
Disclosure of credit risk exposure [line items]    
Transfers and reclassifications    (115)
Loans | Provisions | Lifetime ECL not credit impaired (Stage 2) | Not credit-impaired | Lifetime expected credit losses    
Disclosure of credit risk exposure [line items]    
Transfers and reclassifications  291 449
Loans | Provisions | Lifetime ECL not credit impaired (Stage 2) | Credit impaired | Lifetime expected credit losses    
Disclosure of credit risk exposure [line items]    
Transfers and reclassifications  (180)  
Loans | Provisions | Lifetime ECL credit impaired (Stage 3)    
Disclosure of credit risk exposure [line items]    
Opening balance as at 1 January (3,887) (3,841)
Net remeasurement of loan loss provisions (3) 59
Disposals and redemptions (95) (266)
Net drawdowns and repayments   84
Changes in models/risk parameters (2)  
Increase in loan loss provisions 819 714
Write-offs (379) (787)
Disposals3   (283)
Recoveries of amounts previously written off 23 71
Foreign exchange and other movements 83 258
Closing balance (4,432) (3,887)
Loans | Provisions | Lifetime ECL credit impaired (Stage 3) | Adjustment    
Disclosure of credit risk exposure [line items]    
Opening balance as at 1 January   (73)
Loans | Provisions | Lifetime ECL credit impaired (Stage 3) | Adjusted balance    
Disclosure of credit risk exposure [line items]    
Opening balance as at 1 January   (3,914)
Loans | Provisions | Lifetime ECL credit impaired (Stage 3) | 12-month expected credit losses    
Disclosure of credit risk exposure [line items]    
Transfers and reclassifications  (19) (36)
Loans | Provisions | Lifetime ECL credit impaired (Stage 3) | Lifetime expected credit losses    
Disclosure of credit risk exposure [line items]    
Transfers and reclassifications    978
Loans | Provisions | Lifetime ECL credit impaired (Stage 3) | Not credit-impaired | Lifetime expected credit losses    
Disclosure of credit risk exposure [line items]    
Transfers and reclassifications  (65) € (105)
Loans | Provisions | Lifetime ECL credit impaired (Stage 3) | Credit impaired | Lifetime expected credit losses    
Disclosure of credit risk exposure [line items]    
Transfers and reclassifications  € 1,002