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Equity - Summary of changes in treasury shares (Details) - EUR (€)
€ in Millions
 6 Months Ended 12 Months Ended
Mar. 04, 2024
Jun. 30, 2024
Dec. 31, 2023
Disclosure of equity [line Items]      
Opening balance as at 1 January   € (1,994) € (1,205)
Purchased/sold for trading purposes   2 (7)
Purchased under staff share plans   (43) (42)
Distributed under staff share plans   43 41
Purchased Share buyback programme € (43) (1,533) (3,482)
Cancelled Share buyback programme   2,500 2,701
Closing balance   € (1,024) € (1,994)
Cancelled share buyback programme (in shares)   (194,813,000) (228,350,000)
Treasury shares      
Disclosure of equity [line Items]      
Beginning balance, ordinary shares (in shares)   154,571,000 107,395,000
Issue of shares (in shares)   (279,000) 464,000
Purchased under staff share and stock option plans (in shares)   3,319,000 3,156,000
Distributed under staff share and stock option plans (in shares)   (3,316,000) (3,106,000)
Share buyback programme (in shares)   104,196,000 275,013,000
Ending balance, ordinary shares (in shares)   63,678,000 154,571,000