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Provisions - Summary of changes in provisions (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure of other provisions [line items]    
Opening balance as at 1 January € 1,022 € 961
Additions 325 506
Interest (2)
Releases (82) (221)
Utilised (389) (218)
Exchange rate differences (4) (1)
Other changes (94) (3)
Closing balance 779 1,022
Reorganisation provisions    
Disclosure of other provisions [line items]    
Opening balance as at 1 January 418 421
Additions 207 217
Interest
Releases (34) (46)
Utilised (356) (170)
Exchange rate differences (1)
Other changes (3) (4)
Closing balance 231 418
Litigation    
Disclosure of other provisions [line items]    
Opening balance as at 1 January 150 132
Additions 78 59
Interest
Releases (26) (8)
Utilised (23) (33)
Exchange rate differences 1
Other changes 13
Closing balance 193 150
Other provisions    
Disclosure of other provisions [line items]    
Opening balance as at 1 January 455 407
Additions 39 230
Interest (2)
Releases (22) (166)
Utilised (11) (15)
Exchange rate differences (3)
Other changes (104)
Closing balance € 355 € 455