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Risk management - Gross carrying amount per IFRS 9 stage and rating class (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of credit risk exposure [line items]      
Miscellaneous other liabilities € 13,667.0 € 13,646.0  
Undrawn commitments      
Disclosure of credit risk exposure [line items]      
Undrawn borrowing facilities 151,000.0 150,100.0  
Other positions      
Disclosure of credit risk exposure [line items]      
Miscellaneous other liabilities 9,000.0 4,400.0  
Non IFRS 9 eligible assets commitments      
Disclosure of credit risk exposure [line items]      
Miscellaneous other liabilities 67,000.0 116,100.0  
IAS 37 & IFRS 9 Off-Balance Provisions      
Disclosure of credit risk exposure [line items]      
Miscellaneous other liabilities   109.0  
Gross carrying amount | Loans      
Disclosure of credit risk exposure [line items]      
Financial assets € (1,025,043.0) € (1,009,595.0) € (951,934.0)
Gross carrying amount | Stage 1      
Disclosure of credit risk exposure [line items]      
Percentage of financial assets 91.50% 91.50%  
Gross carrying amount | Stage 1 | Loans      
Disclosure of credit risk exposure [line items]      
Financial assets € (937,633.0) € (922,300.0) (890,386.0)
Gross carrying amount | Stage 2      
Disclosure of credit risk exposure [line items]      
Percentage of financial assets 7.40% 7.30%  
Gross carrying amount | Stage 2 | Loans      
Disclosure of credit risk exposure [line items]      
Financial assets € (75,454.0) € (75,429.0) (49,476.0)
Gross carrying amount | Stage 3      
Disclosure of credit risk exposure [line items]      
Percentage of financial assets 1.20% 1.20%  
Gross carrying amount | Stage 3 | Loans      
Disclosure of credit risk exposure [line items]      
Financial assets € (11,956.0) € (11,866.0) (12,072.0)
Accumulated impairments      
Disclosure of credit risk exposure [line items]      
Financial assets 5,839.0 6,101.0  
Accumulated impairments | Loans      
Disclosure of credit risk exposure [line items]      
Financial assets 5,839.0 6,196.0 5,368.0
Changes in models (102.0)    
Accumulated impairments | Stage 1 | Loans      
Disclosure of credit risk exposure [line items]      
Financial assets 517.0 590.0 501.0
Changes in models 8.0    
Accumulated impairments | Stage 2 | Loans      
Disclosure of credit risk exposure [line items]      
Financial assets 1,435.0 1,692.0 1,016.0
Changes in models (10.0)    
Accumulated impairments | Stage 3 | Loans      
Disclosure of credit risk exposure [line items]      
Financial assets 3,887.0 3,914.0 € 3,851.0
Changes in models (84.0)    
IFRS 9 | Gross carrying amount      
Disclosure of credit risk exposure [line items]      
Financial assets (1,025,043.0) (967,655.0)  
IFRS 9 | Gross carrying amount | 1 (AAA)      
Disclosure of credit risk exposure [line items]      
Financial assets (87,510.0) (101,169.0)  
IFRS 9 | Gross carrying amount | 2-4 (AA)      
Disclosure of credit risk exposure [line items]      
Financial assets (134,711.0) (100,675.0)  
IFRS 9 | Gross carrying amount | 5-7 (A)      
Disclosure of credit risk exposure [line items]      
Financial assets (237,206.0) (182,214.0)  
IFRS 9 | Gross carrying amount | 8-10 (BBB)      
Disclosure of credit risk exposure [line items]      
Financial assets (319,971.0) (336,023.0)  
IFRS 9 | Gross carrying amount | 11-13 (BB)      
Disclosure of credit risk exposure [line items]      
Financial assets (176,661.0) (173,275.0)  
IFRS 9 | Gross carrying amount | 14-16 (B)      
Disclosure of credit risk exposure [line items]      
Financial assets (45,750.0) (43,035.0)  
IFRS 9 | Gross carrying amount | 17 (CCC)      
Disclosure of credit risk exposure [line items]      
Financial assets (4,742.0) (12,244.0)  
IFRS 9 | Gross carrying amount | 18 (CC)      
Disclosure of credit risk exposure [line items]      
Financial assets (4,617.0) (5,198.0)  
IFRS 9 | Gross carrying amount | 19 (C)      
Disclosure of credit risk exposure [line items]      
Financial assets (1,919.0) (2,116.0)  
IFRS 9 | Gross carrying amount | 20-22 (D)      
Disclosure of credit risk exposure [line items]      
Financial assets (11,956.0) (11,708.0)  
IFRS 9 | Gross carrying amount | Stage 1      
Disclosure of credit risk exposure [line items]      
Financial assets (937,633.0) (885,222.0)  
IFRS 9 | Gross carrying amount | Stage 1 | 1 (AAA)      
Disclosure of credit risk exposure [line items]      
Financial assets (87,071.0) (100,885.0)  
IFRS 9 | Gross carrying amount | Stage 1 | 2-4 (AA)      
Disclosure of credit risk exposure [line items]      
Financial assets (132,159.0) (98,181.0)  
IFRS 9 | Gross carrying amount | Stage 1 | 5-7 (A)      
Disclosure of credit risk exposure [line items]      
Financial assets (231,018.0) (177,617.0)  
IFRS 9 | Gross carrying amount | Stage 1 | 8-10 (BBB)      
Disclosure of credit risk exposure [line items]      
Financial assets (302,967.0) (321,308.0)  
IFRS 9 | Gross carrying amount | Stage 1 | 11-13 (BB)      
Disclosure of credit risk exposure [line items]      
Financial assets (157,387.0) (155,910.0)  
IFRS 9 | Gross carrying amount | Stage 1 | 14-16 (B)      
Disclosure of credit risk exposure [line items]      
Financial assets (26,414.0) (23,649.0)  
IFRS 9 | Gross carrying amount | Stage 1 | 17 (CCC)      
Disclosure of credit risk exposure [line items]      
Financial assets (617.0) (7,671.0)  
IFRS 9 | Gross carrying amount | Stage 2      
Disclosure of credit risk exposure [line items]      
Financial assets (75,454.0) (70,725.0)  
Changes in models 100.0    
IFRS 9 | Gross carrying amount | Stage 2 | 1 (AAA)      
Disclosure of credit risk exposure [line items]      
Financial assets (439.0) (284.0)  
IFRS 9 | Gross carrying amount | Stage 2 | 2-4 (AA)      
Disclosure of credit risk exposure [line items]      
Financial assets (2,553.0) (2,493.0)  
IFRS 9 | Gross carrying amount | Stage 2 | 5-7 (A)      
Disclosure of credit risk exposure [line items]      
Financial assets (6,188.0) (4,596.0)  
IFRS 9 | Gross carrying amount | Stage 2 | 8-10 (BBB)      
Disclosure of credit risk exposure [line items]      
Financial assets (17,004.0) (14,714.0)  
IFRS 9 | Gross carrying amount | Stage 2 | 11-13 (BB)      
Disclosure of credit risk exposure [line items]      
Financial assets (19,273.0) (17,365.0)  
IFRS 9 | Gross carrying amount | Stage 2 | 14-16 (B)      
Disclosure of credit risk exposure [line items]      
Financial assets (19,336.0) (19,386.0)  
IFRS 9 | Gross carrying amount | Stage 2 | 17 (CCC)      
Disclosure of credit risk exposure [line items]      
Financial assets (4,125.0) (4,572.0)  
IFRS 9 | Gross carrying amount | Stage 2 | 18 (CC)      
Disclosure of credit risk exposure [line items]      
Financial assets (4,617.0) (5,198.0)  
IFRS 9 | Gross carrying amount | Stage 2 | 19 (C)      
Disclosure of credit risk exposure [line items]      
Financial assets (1,919.0) (2,116.0)  
IFRS 9 | Gross carrying amount | Stage 3      
Disclosure of credit risk exposure [line items]      
Financial assets (11,956.0) (11,708.0)  
IFRS 9 | Gross carrying amount | Stage 3 | 20-22 (D)      
Disclosure of credit risk exposure [line items]      
Financial assets (11,956.0) (11,708.0)  
IFRS 9 | Accumulated impairments      
Disclosure of credit risk exposure [line items]      
Financial assets 5,839.0 6,101.0  
IFRS 9 | Accumulated impairments | 1 (AAA)      
Disclosure of credit risk exposure [line items]      
Financial assets 1.0 2.0  
IFRS 9 | Accumulated impairments | 2-4 (AA)      
Disclosure of credit risk exposure [line items]      
Financial assets 9.0 6.0  
IFRS 9 | Accumulated impairments | 5-7 (A)      
Disclosure of credit risk exposure [line items]      
Financial assets 30.0 27.0  
IFRS 9 | Accumulated impairments | 8-10 (BBB)      
Disclosure of credit risk exposure [line items]      
Financial assets 108.0 127.0  
IFRS 9 | Accumulated impairments | 11-13 (BB)      
Disclosure of credit risk exposure [line items]      
Financial assets 319.0 368.0  
IFRS 9 | Accumulated impairments | 14-16 (B)      
Disclosure of credit risk exposure [line items]      
Financial assets 618.0 639.0  
IFRS 9 | Accumulated impairments | 17 (CCC)      
Disclosure of credit risk exposure [line items]      
Financial assets 242.0 202.0  
IFRS 9 | Accumulated impairments | 18 (CC)      
Disclosure of credit risk exposure [line items]      
Financial assets 402.0 595.0  
IFRS 9 | Accumulated impairments | 19 (C)      
Disclosure of credit risk exposure [line items]      
Financial assets 221.0 293.0  
IFRS 9 | Accumulated impairments | 20-22 (D)      
Disclosure of credit risk exposure [line items]      
Financial assets 3,887.0 3,841.0  
IFRS 9 | Accumulated impairments | Stage 1      
Disclosure of credit risk exposure [line items]      
Financial assets 517.0 581.0  
IFRS 9 | Accumulated impairments | Stage 1 | 1 (AAA)      
Disclosure of credit risk exposure [line items]      
Financial assets 1.0 2.0  
IFRS 9 | Accumulated impairments | Stage 1 | 2-4 (AA)      
Disclosure of credit risk exposure [line items]      
Financial assets 8.0 5.0  
IFRS 9 | Accumulated impairments | Stage 1 | 5-7 (A)      
Disclosure of credit risk exposure [line items]      
Financial assets 24.0 23.0  
IFRS 9 | Accumulated impairments | Stage 1 | 8-10 (BBB)      
Disclosure of credit risk exposure [line items]      
Financial assets 85.0 98.0  
IFRS 9 | Accumulated impairments | Stage 1 | 11-13 (BB)      
Disclosure of credit risk exposure [line items]      
Financial assets 226.0 277.0  
IFRS 9 | Accumulated impairments | Stage 1 | 14-16 (B)      
Disclosure of credit risk exposure [line items]      
Financial assets 164.0 168.0  
IFRS 9 | Accumulated impairments | Stage 1 | 17 (CCC)      
Disclosure of credit risk exposure [line items]      
Financial assets 10.0 8.0  
IFRS 9 | Accumulated impairments | Stage 2      
Disclosure of credit risk exposure [line items]      
Financial assets 1,435.0 1,679.0  
IFRS 9 | Accumulated impairments | Stage 2 | 2-4 (AA)      
Disclosure of credit risk exposure [line items]      
Financial assets 2.0 1.0  
IFRS 9 | Accumulated impairments | Stage 2 | 5-7 (A)      
Disclosure of credit risk exposure [line items]      
Financial assets 6.0 4.0  
IFRS 9 | Accumulated impairments | Stage 2 | 8-10 (BBB)      
Disclosure of credit risk exposure [line items]      
Financial assets 24.0 29.0  
IFRS 9 | Accumulated impairments | Stage 2 | 11-13 (BB)      
Disclosure of credit risk exposure [line items]      
Financial assets 93.0 91.0  
IFRS 9 | Accumulated impairments | Stage 2 | 14-16 (B)      
Disclosure of credit risk exposure [line items]      
Financial assets 455.0 471.0  
IFRS 9 | Accumulated impairments | Stage 2 | 17 (CCC)      
Disclosure of credit risk exposure [line items]      
Financial assets 233.0 194.0  
IFRS 9 | Accumulated impairments | Stage 2 | 18 (CC)      
Disclosure of credit risk exposure [line items]      
Financial assets 402.0 595.0  
IFRS 9 | Accumulated impairments | Stage 2 | 19 (C)      
Disclosure of credit risk exposure [line items]      
Financial assets 221.0 293.0  
IFRS 9 | Accumulated impairments | Stage 3      
Disclosure of credit risk exposure [line items]      
Financial assets 3,887.0 3,841.0  
IFRS 9 | Accumulated impairments | Stage 3 | Purchased credit impaired      
Disclosure of credit risk exposure [line items]      
Financial assets 11.0    
IFRS 9 | Accumulated impairments | Stage 3 | 20-22 (D)      
Disclosure of credit risk exposure [line items]      
Financial assets € 3,887.0 € 3,841.0