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Provisions - Main Data of Defined Benefit Plans (Details) - EUR (€)
€ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of net defined benefit liability (asset) [line items]      
Net provision € 338 € 408  
Post-employment defined benefit plans      
Disclosure of net defined benefit liability (asset) [line items]      
Total 309 385  
Net provision 338 408  
Net assets 29 23  
Obligation | Post-employment defined benefit plans      
Disclosure of net defined benefit liability (asset) [line items]      
Total 913 960 € 1,086
Assets | Post-employment defined benefit plans      
Disclosure of net defined benefit liability (asset) [line items]      
Total (870) (774) (801)
Net provision before asset ceiling | Post-employment defined benefit plans      
Disclosure of net defined benefit liability (asset) [line items]      
Total 43 186  
Asset ceiling | Post-employment defined benefit plans      
Disclosure of net defined benefit liability (asset) [line items]      
Total 266 199  
Germany | Operating segments | Post-employment defined benefit plans      
Disclosure of net defined benefit liability (asset) [line items]      
Total 107 223  
Net provision 117 231  
Net assets 10 8  
Germany | Operating segments | Obligation | Post-employment defined benefit plans      
Disclosure of net defined benefit liability (asset) [line items]      
Total 208 322 350
Germany | Operating segments | Assets | Post-employment defined benefit plans      
Disclosure of net defined benefit liability (asset) [line items]      
Total (101) (99) (95)
Germany | Operating segments | Net provision before asset ceiling | Post-employment defined benefit plans      
Disclosure of net defined benefit liability (asset) [line items]      
Total 107 223  
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 137 88  
Net provision 138 103  
Net assets 1 15  
Brazil | Operating segments | Obligation | Post-employment defined benefit plans      
Disclosure of net defined benefit liability (asset) [line items]      
Total 622 549 643
Brazil | Operating segments | Assets | Post-employment defined benefit plans      
Disclosure of net defined benefit liability (asset) [line items]      
Total (751) (660) (693)
Brazil | Operating segments | Net provision before asset ceiling | Post-employment defined benefit plans      
Disclosure of net defined benefit liability (asset) [line items]      
Total (129) (111)  
Brazil | Operating segments | Asset ceiling | Post-employment defined benefit plans      
Disclosure of net defined benefit liability (asset) [line items]      
Total 266 199  
Hispam | Operating segments | Post-employment defined benefit plans      
Disclosure of net defined benefit liability (asset) [line items]      
Total 64 67  
Net provision 75 67  
Net assets 11 0  
Hispam | Operating segments | Obligation | Post-employment defined benefit plans      
Disclosure of net defined benefit liability (asset) [line items]      
Total 64 67 74
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 64 67  
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 7  
Net provision 8 7  
Net assets 7 0  
Others | Operating segments | Obligation | Post-employment defined benefit plans      
Disclosure of net defined benefit liability (asset) [line items]      
Total 19 22 19
Others | Operating segments | Assets | Post-employment defined benefit plans      
Disclosure of net defined benefit liability (asset) [line items]      
Total (18) (15) € (13)
Others | Operating segments | Net provision before asset ceiling | Post-employment defined benefit plans      
Disclosure of net defined benefit liability (asset) [line items]      
Total 1 7  
Others | Operating segments | Asset ceiling | Post-employment defined benefit plans      
Disclosure of net defined benefit liability (asset) [line items]      
Total € 0 € 0