v3.25.4

Derivative financial instruments - Schedule of Fair Values and Notional Amounts of Derivative Instruments (Details) - GBP (£) £ in Millions | Dec. 31, 2025 | Dec. 31, 2024
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DERIVATIVE FINANCIAL INSTRUMENTS (Details) - Schedule of Derivative Instruments [Line Items] |  |
Contract/ notional amount £m | £ 16,574,438 | £ 14,304,441
Derivative assets £m | 19,727 | 24,065
Derivative liabilities £m | 16,132 | 21,676
Trading and other |  |
DERIVATIVE FINANCIAL INSTRUMENTS (Details) - Schedule of Derivative Instruments [Line Items] |  |
Contract/ notional amount £m | 15,789,986 | 13,586,375
Derivative assets £m | 19,702 | 24,017
Derivative liabilities £m | 15,842 | 21,321
Hedging |  |
DERIVATIVE FINANCIAL INSTRUMENTS (Details) - Schedule of Derivative Instruments [Line Items] |  |
Contract/ notional amount £m | 784,452 | 718,066
Derivative assets £m | 25 | 48
Derivative liabilities £m | 290 | 355
Fair value hedges |  |
DERIVATIVE FINANCIAL INSTRUMENTS (Details) - Schedule of Derivative Instruments [Line Items] |  |
Contract/ notional amount £m | 211,772 | 231,107
Fair value hedges | Hedging |  |
DERIVATIVE FINANCIAL INSTRUMENTS (Details) - Schedule of Derivative Instruments [Line Items] |  |
Contract/ notional amount £m | 211,772 | 231,107
Derivative assets £m | 12 | 8
Derivative liabilities £m | 253 | 337
Cash flow hedges |  |
DERIVATIVE FINANCIAL INSTRUMENTS (Details) - Schedule of Derivative Instruments [Line Items] |  |
Contract/ notional amount £m | 572,680 | 486,959
Cash flow hedges | Hedging |  |
DERIVATIVE FINANCIAL INSTRUMENTS (Details) - Schedule of Derivative Instruments [Line Items] |  |
Contract/ notional amount £m | 572,680 | 486,959
Derivative assets £m | 13 | 40
Derivative liabilities £m | 37 | 18
Exchange rate contracts | Trading and other |  |
DERIVATIVE FINANCIAL INSTRUMENTS (Details) - Schedule of Derivative Instruments [Line Items] |  |
Contract/ notional amount £m | 689,215 | 707,329
Derivative assets £m | 7,594 | 10,247
Derivative liabilities £m | 6,454 | 9,172
Interest rate contracts | Trading and other |  |
DERIVATIVE FINANCIAL INSTRUMENTS (Details) - Schedule of Derivative Instruments [Line Items] |  |
Contract/ notional amount £m | 15,086,291 | 12,864,265
Derivative assets £m | 11,797 | 13,436
Derivative liabilities £m | 8,924 | 11,644
Credit derivatives | Trading and other |  |
DERIVATIVE FINANCIAL INSTRUMENTS (Details) - Schedule of Derivative Instruments [Line Items] |  |
Contract/ notional amount £m | 5,566 | 6,103
Derivative assets £m | 75 | 87
Derivative liabilities £m | 170 | 172
Equity, commodity and other contracts | Trading and other |  |
DERIVATIVE FINANCIAL INSTRUMENTS (Details) - Schedule of Derivative Instruments [Line Items] |  |
Contract/ notional amount £m | 8,914 | 8,678
Derivative assets £m | 236 | 247
Derivative liabilities £m | 294 | 333
Currency swaps | Fair value hedges | Hedging |  |
DERIVATIVE FINANCIAL INSTRUMENTS (Details) - Schedule of Derivative Instruments [Line Items] |  |
Contract/ notional amount £m | 35 | 43
Derivative assets £m | 4 | 2
Derivative liabilities £m | 0 | 0
Currency swaps | Cash flow hedges | Hedging |  |
DERIVATIVE FINANCIAL INSTRUMENTS (Details) - Schedule of Derivative Instruments [Line Items] |  |
Contract/ notional amount £m | 1,554 | 1,963
Derivative assets £m | 6 | 30
Derivative liabilities £m | 33 | 14
Interest rate swaps | Fair value hedges | Hedging |  |
DERIVATIVE FINANCIAL INSTRUMENTS (Details) - Schedule of Derivative Instruments [Line Items] |  |
Contract/ notional amount £m | 211,737 | 231,064
Derivative assets £m | 8 | 6
Derivative liabilities £m | 253 | 337
Interest rate swaps | Cash flow hedges | Hedging |  |
DERIVATIVE FINANCIAL INSTRUMENTS (Details) - Schedule of Derivative Instruments [Line Items] |  |
Contract/ notional amount £m | 571,126 | 484,996
Derivative assets £m | 7 | 10
Derivative liabilities £m | £ 4 | £ 4

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