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Net trading income (losses) - Schedule of Net Trading Income (Details) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Net gains on financial assets and liabilities at fair value through profit or loss:      
Investment property gains (losses) £ 99 £ 67 £ (87)
Net trading income 1,485 1,812 [1] 1,307 [1]
Retail and Commercial Banking      
Net gains on financial assets and liabilities at fair value through profit or loss:      
Net gains (losses) on financial instruments held for trading 716 778 518
Net gains on other financial instruments mandatorily held at fair value through profit or loss 555 662 561
Net losses on financial liabilities designated at fair value through profit or loss (252) (336) (341)
Net gains (losses) on financial assets and liabilities at fair value through profit or loss 1,019 1,104 738
Foreign exchange 411 687 585
Investment property gains (losses) 55 21 (16)
Fair value hedges      
Net gains on financial assets and liabilities at fair value through profit or loss:      
Gain (loss) on hedge ineffectiveness recognised in profit or loss (54) (81) (267)
Cash flow hedges      
Net gains on financial assets and liabilities at fair value through profit or loss:      
Gain (loss) on hedge ineffectiveness recognised in profit or loss £ 54 £ (60) £ 19
[1] 1Comparative periods have been represented for presentational changes. See note 1.