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Derivatives and hedge accounting - Movement cash flow hedge reserve (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of detailed information about hedged items [line items]      
Opening balance € (2,192) € (540)  
Income tax 251 (875) € (233)
Exchange rate differences and other [1] (85) 436 143
Closing balance (2,767) (2,192) (540)
Reserve of cash flow hedges      
Disclosure of detailed information about hedged items [line items]      
Opening balance (3,055) (153) 1,450
Value changes recognised in OCI 1,922 (3,982)  
Amounts recycled to profit or loss (325) (313)  
Income tax (381) 1,123  
Exchange rate differences and other (103) 20  
Adjustment for non controlling interest (116) 251  
Movement for the year 997 (2,901)  
Closing balance € (2,058) € (3,055) € (153)
[1] 1 Includes impact of application of hyperinflation accounting under IAS 29.