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Provisions - Movement in the Present Value of Obligations (Details) - Post-employment defined benefit plans - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Net Defined Benefit Liability Asset [Roll Forward]    
Net defined benefit liability (asset) at beginning of period € 309  
Net defined benefit liability (asset) at end of period 395 € 309
Present value of obligation    
Net Defined Benefit Liability Asset [Roll Forward]    
Net defined benefit liability (asset) at beginning of period 913 960
Translation differences 31 68
Current service cost 19 19
Interest cost 78 63
Actuarial losses and gains 118 (130)
Benefits paid (61) (58)
Plan curtailments (3) (3)
Other movements (6) (6)
Net defined benefit liability (asset) at end of period 1,089 913
Germany | Operating segments    
Net Defined Benefit Liability Asset [Roll Forward]    
Net defined benefit liability (asset) at beginning of period 107  
Net defined benefit liability (asset) at end of period 133 107
Germany | Operating segments | Present value of obligation    
Net Defined Benefit Liability Asset [Roll Forward]    
Net defined benefit liability (asset) at beginning of period 208 322
Translation differences 0 0
Current service cost 11 11
Interest cost 8 3
Actuarial losses and gains 15 (123)
Benefits paid (6) (5)
Plan curtailments 0 0
Other movements 0 0
Net defined benefit liability (asset) at end of period 236 208
Brazil | Operating segments    
Net Defined Benefit Liability Asset [Roll Forward]    
Net defined benefit liability (asset) at beginning of period 137  
Net defined benefit liability (asset) at end of period 187 137
Brazil | Operating segments | Present value of obligation    
Net Defined Benefit Liability Asset [Roll Forward]    
Net defined benefit liability (asset) at beginning of period 622 549
Translation differences 27 74
Current service cost 2 3
Interest cost 61 54
Actuarial losses and gains 101 (10)
Benefits paid (49) (48)
Plan curtailments 0 0
Other movements 0 0
Net defined benefit liability (asset) at end of period 764 622
Hispam | Operating segments    
Net Defined Benefit Liability Asset [Roll Forward]    
Net defined benefit liability (asset) at beginning of period 64  
Net defined benefit liability (asset) at end of period 74 64
Hispam | Operating segments | Present value of obligation    
Net Defined Benefit Liability Asset [Roll Forward]    
Net defined benefit liability (asset) at beginning of period 64 67
Translation differences 4 (7)
Current service cost 5 4
Interest cost 8 6
Actuarial losses and gains 2 3
Benefits paid (5) (4)
Plan curtailments (3) (3)
Other movements (1) (2)
Net defined benefit liability (asset) at end of period 74 64
Others | Operating segments    
Net Defined Benefit Liability Asset [Roll Forward]    
Net defined benefit liability (asset) at beginning of period 1  
Net defined benefit liability (asset) at end of period 1 1
Others | Operating segments | Present value of obligation    
Net Defined Benefit Liability Asset [Roll Forward]    
Net defined benefit liability (asset) at beginning of period 19 22
Translation differences 0 1
Current service cost 1 1
Interest cost 1 0
Actuarial losses and gains 0 0
Benefits paid (1) (1)
Plan curtailments 0 0
Other movements (5) (4)
Net defined benefit liability (asset) at end of period € 15 € 19