Note 6 Main margins and profit by operating segments (Details) - EUR (€)
€ in Millions

12 Months Ended

Dec. 31, 2025

Dec. 31, 2024

^[1]

Dec. 31, 2023

^[1]

Disclosure of operating segments [line items]

Interest income (expense)

€ (26,280)

€ (25,267)

€ (23,089)

36,931

35,481

29,542

Profit (loss) before tax

16,227

15,405

12,419

Profit (loss), attributable to owners of parent

(10,511)

(10,054)

(8,019)

Disclosure of operating segments [line items]

Interest income (expense)

(6,588)

(6,384)

(5,570)

10,027

9,443

7,848

Profit (loss) before tax

5,933

5,263

3,855

Profit (loss), attributable to owners of parent

(4,175)

(3,752)

(2,690)

Disclosure of operating segments [line items]

Interest income (expense)

(11,424)

(11,556)

(11,054)

15,198

15,337

14,267

Profit (loss) before tax

7,341

7,522

7,329

Profit (loss), attributable to owners of parent

(5,264)

(5,447)

(5,319)

Disclosure of operating segments [line items]

Interest income (expense)

(3,079)

(1,492)

(1,869)

5,213

4,212

2,981

Profit (loss) before tax

1,863

1,741

1,324

Profit (loss), attributable to owners of parent

(805)

(611)

(527)

South America [Member]

Disclosure of operating segments [line items]

Interest income (expense)

(4,830)

(5,589)

(4,394)

5,363

5,405

4,331

Profit (loss) before tax

1,758

1,342

1,189

Profit (loss), attributable to owners of parent

(726)

(635)

(601)

Rest of business [Member]

Disclosure of operating segments [line items]

Interest income (expense)

(828)

(742)

(539)

1,807

1,472

1,113

Profit (loss) before tax

772

648

499

Profit (loss), attributable to owners of parent

(627)

(511)

(403)

Corporate Center And Adjustments [Member]

Disclosure of operating segments [line items]

Interest income (expense)

469

495

336

(678)

(388)

(999)

Profit (loss) before tax

(1,440)

(1,110)

(1,777)

Profit (loss), attributable to owners of parent

€ 1,086

€ 901

€ 1,522

[1]

(1) In the first quarter of 2025 certain immaterial balance sheet amounts related to specific activities undertaken by the business units were reallocated between the operating segments and the Corporate Center. As a result, certain expenses were reallocated, in particular, between Spain, Rest of Business and the Corporate Center. In order to make the period-on-period comparison homogeneous, the figures for the years 2024 and 2023 have been revised, which has not affected the consolidated financial information of the Group.