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Provisions - Main Data of Defined Benefit Plans (Details) - EUR (€)
€ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of net defined benefit liability (asset) [line items]      
Net provision € 339 € 440  
Post-employment defined benefit plans      
Disclosure of net defined benefit liability (asset) [line items]      
Total 284 395  
Net provision 339 440  
Net assets 55 45  
Obligation | Post-employment defined benefit plans      
Disclosure of net defined benefit liability (asset) [line items]      
Total 862 1,089 € 913
Assets | Post-employment defined benefit plans      
Disclosure of net defined benefit liability (asset) [line items]      
Total (751) (894) (870)
Net provision before asset ceiling | Post-employment defined benefit plans      
Disclosure of net defined benefit liability (asset) [line items]      
Total 111 195  
Asset ceiling | Post-employment defined benefit plans      
Disclosure of net defined benefit liability (asset) [line items]      
Total 173 200  
Germany | Operating segments | Post-employment defined benefit plans      
Disclosure of net defined benefit liability (asset) [line items]      
Total 120 133  
Net provision 130 143  
Net assets 10 10  
Germany | Operating segments | Obligation | Post-employment defined benefit plans      
Disclosure of net defined benefit liability (asset) [line items]      
Total 226 236 208
Germany | Operating segments | Assets | Post-employment defined benefit plans      
Disclosure of net defined benefit liability (asset) [line items]      
Total (106) (103) (101)
Germany | Operating segments | Net provision before asset ceiling | Post-employment defined benefit plans      
Disclosure of net defined benefit liability (asset) [line items]      
Total 120 133  
Germany | Operating segments | Asset ceiling | Post-employment defined benefit plans      
Disclosure of net defined benefit liability (asset) [line items]      
Total 0 0  
Brazil | Operating segments | Post-employment defined benefit plans      
Disclosure of net defined benefit liability (asset) [line items]      
Total 89 187  
Net provision 113 201  
Net assets 24 14  
Brazil | Operating segments | Obligation | Post-employment defined benefit plans      
Disclosure of net defined benefit liability (asset) [line items]      
Total 544 764 622
Brazil | Operating segments | Assets | Post-employment defined benefit plans      
Disclosure of net defined benefit liability (asset) [line items]      
Total (628) (777) (751)
Brazil | Operating segments | Net provision before asset ceiling | Post-employment defined benefit plans      
Disclosure of net defined benefit liability (asset) [line items]      
Total (84) (13)  
Brazil | Operating segments | Asset ceiling | Post-employment defined benefit plans      
Disclosure of net defined benefit liability (asset) [line items]      
Total 173 200  
Hispam | Operating segments | Post-employment defined benefit plans      
Disclosure of net defined benefit liability (asset) [line items]      
Total 75 74  
Net provision 90 86  
Net assets 15 12  
Hispam | Operating segments | Obligation | Post-employment defined benefit plans      
Disclosure of net defined benefit liability (asset) [line items]      
Total 75 74 64
Hispam | Operating segments | Assets | Post-employment defined benefit plans      
Disclosure of net defined benefit liability (asset) [line items]      
Total 0 0  
Hispam | Operating segments | Net provision before asset ceiling | Post-employment defined benefit plans      
Disclosure of net defined benefit liability (asset) [line items]      
Total 75 74  
Hispam | Operating segments | Asset ceiling | Post-employment defined benefit plans      
Disclosure of net defined benefit liability (asset) [line items]      
Total 0 0  
Others | Operating segments | Post-employment defined benefit plans      
Disclosure of net defined benefit liability (asset) [line items]      
Total 0 1  
Net provision 6 10  
Net assets 6 9  
Others | Operating segments | Obligation | Post-employment defined benefit plans      
Disclosure of net defined benefit liability (asset) [line items]      
Total 17 15 19
Others | Operating segments | Assets | Post-employment defined benefit plans      
Disclosure of net defined benefit liability (asset) [line items]      
Total (17) (14) € (18)
Others | Operating segments | Net provision before asset ceiling | Post-employment defined benefit plans      
Disclosure of net defined benefit liability (asset) [line items]      
Total 0 1  
Others | Operating segments | Asset ceiling | Post-employment defined benefit plans      
Disclosure of net defined benefit liability (asset) [line items]      
Total € 0 € 0