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Provisions - Main Data of Defined Benefit Plans (Details) - EUR (€)
€ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of net defined benefit liability (asset) [line items]      
Net provision € 440 € 338  
Post-employment defined benefit plans      
Disclosure of net defined benefit liability (asset) [line items]      
Total 395 309  
Net provision 440 338  
Net assets 45 29  
Obligation | Post-employment defined benefit plans      
Disclosure of net defined benefit liability (asset) [line items]      
Total 1,089 913 € 960
Assets | Post-employment defined benefit plans      
Disclosure of net defined benefit liability (asset) [line items]      
Total (894) (870) (774)
Net provision before asset ceiling | Post-employment defined benefit plans      
Disclosure of net defined benefit liability (asset) [line items]      
Total 195 43  
Asset ceiling | Post-employment defined benefit plans      
Disclosure of net defined benefit liability (asset) [line items]      
Total 200 266  
Germany | Operating segments | Post-employment defined benefit plans      
Disclosure of net defined benefit liability (asset) [line items]      
Total 133 107  
Net provision 143 117  
Net assets 10 10  
Germany | Operating segments | Obligation | Post-employment defined benefit plans      
Disclosure of net defined benefit liability (asset) [line items]      
Total 236 208 322
Germany | Operating segments | Assets | Post-employment defined benefit plans      
Disclosure of net defined benefit liability (asset) [line items]      
Total (103) (101) (99)
Germany | Operating segments | Net provision before asset ceiling | Post-employment defined benefit plans      
Disclosure of net defined benefit liability (asset) [line items]      
Total 133 107  
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 187 137  
Net provision 201 138  
Net assets 14 1  
Brazil | Operating segments | Obligation | Post-employment defined benefit plans      
Disclosure of net defined benefit liability (asset) [line items]      
Total 764 622 549
Brazil | Operating segments | Assets | Post-employment defined benefit plans      
Disclosure of net defined benefit liability (asset) [line items]      
Total (777) (751) (660)
Brazil | Operating segments | Net provision before asset ceiling | Post-employment defined benefit plans      
Disclosure of net defined benefit liability (asset) [line items]      
Total (13) (129)  
Brazil | Operating segments | Asset ceiling | Post-employment defined benefit plans      
Disclosure of net defined benefit liability (asset) [line items]      
Total 200 266  
Hispam | Operating segments | Post-employment defined benefit plans      
Disclosure of net defined benefit liability (asset) [line items]      
Total 74 64  
Net provision 86 75  
Net assets 12 11  
Hispam | Operating segments | Obligation | Post-employment defined benefit plans      
Disclosure of net defined benefit liability (asset) [line items]      
Total 74 64 67
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 74 64  
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 1 1  
Net provision 10 8  
Net assets 9 7  
Others | Operating segments | Obligation | Post-employment defined benefit plans      
Disclosure of net defined benefit liability (asset) [line items]      
Total 15 19 22
Others | Operating segments | Assets | Post-employment defined benefit plans      
Disclosure of net defined benefit liability (asset) [line items]      
Total (14) (18) € (15)
Others | Operating segments | Net provision before asset ceiling | Post-employment defined benefit plans      
Disclosure of net defined benefit liability (asset) [line items]      
Total 1 1  
Others | Operating segments | Asset ceiling | Post-employment defined benefit plans      
Disclosure of net defined benefit liability (asset) [line items]      
Total € 0 € 0