v3.26.1
Provisions - Schedule of changes in fair value of plan assets (Details) - Spain - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Post-employment plans      
Insurance contracts linked to pensions      
Fair value of insurance contracts linked to pensions at beginning of year € 81 € 93 € 104
Incorporation of Group companies, net 0 0 0
Expected return on insurance contracts linked to pensions 3 3 4
Benefits paid (12) (13) (15)
Paid premiums 0 0 0
Actuarial gains/(losses) (5) (2) 0
Fair value of insurance contracts linked to pensions at end of year 67 81 93
Other similar obligations      
Insurance contracts linked to pensions      
Fair value of insurance contracts linked to pensions at beginning of year 0 0 0
Incorporation of Group companies, net 0 0 0
Expected return on insurance contracts linked to pensions 0 0 0
Benefits paid 0 0 0
Paid premiums 0 0 0
Actuarial gains/(losses) 0 0 0
Fair value of insurance contracts linked to pensions at end of year 0 0 0
Plan assets | Post-employment plans      
Disclosure of net defined benefit liability (asset) [line items]      
Fair value of plan assets at beginning of year 1,234 1,235 861
Incorporation of Group companies, net 0 0 0
Expected return on plan assets 40 43 40
Gains/(losses) on settlements 7 0 0
Benefits paid (144) (124) (89)
Contributions/(surrenders) (7) 58 409
Actuarial gains/(losses) (64) 27 25
Exchange differences and other items (8) (5) (11)
Fair value of plan assets at end of year 1,058 1,234 1,235
Plan assets | Other similar obligations      
Disclosure of net defined benefit liability (asset) [line items]      
Fair value of plan assets at beginning of year 5 7 8
Incorporation of Group companies, net 0 0 0
Expected return on plan assets 0 0 0
Gains/(losses) on settlements 0 0 0
Benefits paid (2) (2) (2)
Contributions/(surrenders) 0 0 0
Actuarial gains/(losses) 0 0 0
Exchange differences and other items 0 0 1
Fair value of plan assets at end of year € 3 € 5 € 7