v3.26.1
Provisions - Schedule of defined benefit obligation expenses recognized in the consolidated income statements (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]      
Post-employment benefit expense in profit or loss, defined benefit plans € 41 € 45 € 42
Post-employment plans | Spain      
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost 5 3 2
Interest cost (net) 27 28 42
Expected return on insurance contracts linked to pensions (3) (3) (4)
Actuarial (gains)/losses recognised in the year 0 0 0
Past service cost 0 3 2
Pre-retirement cost 0 0 0
Other (16) (10) (1)
Post-employment benefit expense in profit or loss, defined benefit plans 13 21 41
Other similar obligations | Spain      
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost 1 1 1
Interest cost (net) 27 25 30
Expected return on insurance contracts linked to pensions 0 0 0
Actuarial (gains)/losses recognised in the year (19) 0 7
Past service cost 0 0 13
Pre-retirement cost 389 303 160
Other 0 (4) (1)
Post-employment benefit expense in profit or loss, defined benefit plans € 398 € 325 € 210