Credit risk - Schedule of Derivative Assets (Details) - GBP (£) £ in Millions	Dec. 31, 2025	Dec. 31, 2024
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Derivative Assets [Line Items]
Trading and other	£ 19,702	£ 24,017
Hedging	25	48
Total derivative financial instruments	19,727	24,065
Investment grade
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Derivative Assets [Line Items]
Trading and other	18,361	22,684
Hedging	24	39
Total derivative financial instruments	18,385	22,723
Other
FINANCIAL RISK MANAGEMENT (Details) - Schedule of Derivative Assets [Line Items]
Trading and other	1,341	1,333
Hedging	1	9
Total derivative financial instruments	£ 1,342	£ 1,342

The amount of financial assets classified as derivative instruments. [Refer: Financial assets; Derivatives [member]]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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The amount of derivative financial assets held for hedging. [Refer: Derivative financial assets]

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The amount of derivative financial assets held for trading. [Refer: Derivative financial assets; Financial assets at fair value through profit or loss, classified as held for trading]

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