v3.26.1
Provisions - Schedule of status and changes of the defined benefit obligations (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of net defined benefit liability (asset) [line items]      
Benefits paid due to settlements € (133) € (20) € (2)
Spain      
Disclosure of net defined benefit liability (asset) [line items]      
Financial actuarial (gains)/losses (33)    
Spain | Present value of defined benefit obligation | Post-employment plans      
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability (asset) at beginning of period 1,899 1,987 2,076
Incorporation of Group companies, net 0 0 0
Current service cost 5 3 2
Interest cost 67 71 82
Pre-retirement cost 0 0 0
Effect of curtailment/settlement (9) (10) (1)
Benefits paid (179) (203) (210)
Benefits paid due to settlements (31) (2) 0
Past service cost 0 3 2
Actuarial (gains)/losses (102) 45 37
Demographic actuarial (gains)/losses (14) 0 (2)
Financial actuarial (gains)/losses (88) 45 39
Exchange differences and other items (6) 5 (1)
Net defined benefit liability (asset) at end of period 1,644 1,899 1,987
Spain | Present value of defined benefit obligation | Other similar obligations      
Disclosure of net defined benefit liability (asset) [line items]      
Net defined benefit liability (asset) at beginning of period 857 824 903
Incorporation of Group companies, net 0 0 0
Current service cost 1 1 1
Interest cost 27 25 30
Pre-retirement cost 389 303 160
Effect of curtailment/settlement 0 (4) (1)
Benefits paid (325) (292) (290)
Benefits paid due to settlements 0 0 0
Past service cost 0 0 13
Actuarial (gains)/losses (19) 0 7
Demographic actuarial (gains)/losses (8) (1) 0
Financial actuarial (gains)/losses (11) 1 7
Exchange differences and other items 0 0 1
Net defined benefit liability (asset) at end of period € 930 € 857 € 824