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Primary and secondary segments reporting - Schedule of reconciliation of consolidated profit after tax to operating profit before tax (Details) - EUR (€) € in Millions | 8 Months Ended | 12 Months Ended
--- | --- | ---
Aug. 31, 2025 | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Reconciliation of statutory results to underlying results |  |  |  |
Net interest income |  | € 42,348.0 | € 43,787.0 | € 40,650.0
Net fee income |  | 12,976.0 | 12,376.0 | 11,495.0
Gains (losses) on financial transactions |  | 2,362.0 | 2,211.0 | 2,565.0
Other operating income |  | 625.0 | (331.0) | (759.0)
Total income |  | 58,311.0 | 58,043.0 | 53,951.0
Administrative expenses, depreciation and amortisation |  | (24,779.0) | (25,215.0) | (24,684.0)
Other operating costs |  | 0.0 | 0.0 | 0.0
Net operating income |  | 33,532.0 | 32,828.0 | 29,267.0
Net loan-loss provisions |  | (12,596.0) | (12,183.0) | (12,260.0)
Other gains (losses) and provisions |  | (2,255.0) | (3,298.0) | (2,002.0)
Operating profit/(loss) before tax | € 6,193.0 | 18,681.0 | 17,347.0 | 15,005.0
Tax on profit | € (635.0) | (4,723.0) | (4,844.0) | (3,880.0)
Profit/(loss) from continuing operations |  | 13,958.0 | 12,503.0 | 11,125.0
Profit from discontinued operations (net) |  | 1,542.0 | 1,241.0 | 1,058.0
Profit/(loss) for the year |  | 15,500.0 | 13,744.0 | 12,183.0
Non-controlling interests |  | (1,399.0) | (1,170.0) | (1,107.0)
Underlying profit attributable to the parent |  | 14,101.0 | 12,574.0 | 11,076.0
Adjustments related to the Poland disposal |  |  |  |
Reconciliation of statutory results to underlying results |  |  |  |
Net interest income |  | 53.0 | 37.0 | 68.0
Net fee income |  | (48.0) | (41.0) | (27.0)
Gains (losses) on financial transactions |  | (8.0) | 5.0 | 1.0
Other operating income |  | 0.0 | (60.0) | (53.0)
Total income |  | (3.0) | (59.0) | (11.0)
Administrative expenses, depreciation and amortisation |  | 22.0 | 80.0 | 69.0
Other operating costs |  | 0.0 | 0.0 | 0.0
Net operating income |  | 19.0 | 21.0 | 58.0
Net loan-loss provisions |  | 1.0 | 9.0 | 2.0
Other gains (losses) and provisions |  | (1.0) | 0.0 | 1.0
Operating profit/(loss) before tax |  | 19.0 | 30.0 | 61.0
Tax on profit |  | (6.0) | (9.0) | (19.0)
Profit/(loss) from continuing operations |  | 13.0 | 21.0 | 42.0
Profit from discontinued operations (net) |  | (1,542.0) | (1,241.0) | (1,058.0)
Profit/(loss) for the year |  | (1,529.0) | (1,220.0) | (1,016.0)
Non-controlling interests |  | 580.0 | 420.0 | 342.0
Underlying profit attributable to the parent |  | (949.0) | (800.0) | (674.0)
Other adjustments |  |  |  |
Reconciliation of statutory results to underlying results |  |  |  |
Net interest income |  | 0.0 |  | 0.0
Net fee income |  | 0.0 |  | 0.0
Gains (losses) on financial transactions |  | 0.0 |  | 0.0
Other operating income |  | 0.0 |  | 0.0
Total income |  | 0.0 | 0.0 | 0.0
Administrative expenses, depreciation and amortisation |  | 0.0 | 0.0 | 0.0
Other operating costs |  | (1,653.0) | 2,219.0 | (1,886.0)
Net operating income |  | (1,653.0) | (2,219.0) | (1,886.0)
Net loan-loss provisions |  | 467.0 | 352.0 | 474.0
Other gains (losses) and provisions |  | 1,422.0 | 1,867.0 | 1,651.0
Operating profit/(loss) before tax |  | 236.0 | 0.0 | 239.0
Tax on profit |  | (210.0) | 0.0 | (213.0)
Profit/(loss) from continuing operations |  | 26.0 | 0.0 | 26.0
Profit from discontinued operations (net) |  | 0.0 | 0.0 | 0.0
Profit/(loss) for the year |  | 26.0 | 0.0 | 26.0
Non-controlling interests |  | (26.0) | 0.0 | (26.0)
Underlying profit attributable to the parent |  | 0.0 | 0.0 | 0.0
Underlying results |  |  |  |
Reconciliation of statutory results to underlying results |  |  |  |
Net interest income |  | 42,401.0 | 43,824.0 | 40,718.0
Net fee income |  | 12,928.0 | 12,335.0 | 11,468.0
Gains (losses) on financial transactions |  | 2,354.0 | 2,216.0 | 2,566.0
Other operating income |  | 625.0 | (391.0) | (812.0)
Total income |  | 58,308.0 | 57,984.0 | 53,940.0
Administrative expenses, depreciation and amortisation |  | (24,757.0) | (25,135.0) | (24,615.0)
Other operating costs |  | (1,653.0) | 2,219.0 | (1,886.0)
Net operating income |  | 31,898.0 | 30,630.0 | 27,439.0
Net loan-loss provisions |  | (12,128.0) | (11,822.0) | (11,784.0)
Other gains (losses) and provisions |  | (834.0) | (1,431.0) | (350.0)
Operating profit/(loss) before tax |  | 18,936.0 | 17,377.0 | 15,305.0
Tax on profit |  | (4,939.0) | (4,853.0) | (4,112.0)
Profit/(loss) from continuing operations |  | 13,997.0 | 12,524.0 | 11,193.0
Profit from discontinued operations (net) |  | 0.0 | 0.0 | 0.0
Profit/(loss) for the year |  | 13,997.0 | 12,524.0 | 11,193.0
Non-controlling interests |  | (845.0) | (750.0) | (791.0)
Underlying profit attributable to the parent |  | 13,152.0 | 11,774.0 | 10,402.0
Provision (release) of provision corresponding to results from commitments and contingent risks |  | € 50.0 | € 47.0 | € (38.0)

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