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Equity - Schedule of changes in treasury shares (Details) - EUR (€)
€ in Millions
 1 Months Ended 5 Months Ended 12 Months Ended
Mar. 31, 2023
Oct. 13, 2023
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of equity [Line Items]          
Opening balance     € (1,205) € (1,612) € (4)
Purchased/sold for trading purposes     (7) 4 (4)
Purchased under staff share plans     (42)    
Distributed under staff share plans     41    
Purchased Share buyback programme     (3,482) (1,721) (1,604)
Cancelled Share buyback programme     2,701 2,124  
Closing balance     € (1,994) € (1,205) € (1,612)
Beginning balance, ordinary shares (in shares)     3,726,539,000 3,904,065,000 3,900,669,000
Issue of shares (in shares)     5,000 2,935,000 3,397,000
Share buyback programme (in shares)   121,300,000      
Cancelled Share buyback programme (in shares) (107,000,000)   (228,350,000) (180,461,000)  
Ending balance, ordinary shares (in shares)     3,498,194,000 3,726,539,000 3,904,065,000
Treasury shares          
Disclosure of equity [Line Items]          
Beginning balance, ordinary shares (in shares)     107,395,000 128,301,000 572,000
Issue of shares (in shares)     464,000 (312,000) 102,000
Purchased under staff share and stock option plans (in shares)     3,156,000    
Distributed under staff share and stock option plans (in shares)     (3,106,000)    
Share buyback programme (in shares)     275,013,000 159,866,000 127,628,000
Ending balance, ordinary shares (in shares)     154,571,000 107,395,000 128,301,000