v3.25.4

Derivative financial instruments - Schedule of Amount, Timing and Uncertainty of Future Cash Flows (Details) - GBP (£) £ in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024
DERIVATIVE FINANCIAL INSTRUMENTS (Details) - Schedule of Amount, timing and uncertainty of future cash flows [Line Items] |  |
Contract/ notional amount £m | £ 16,574,438 | £ 14,304,441
Hedging |  |
DERIVATIVE FINANCIAL INSTRUMENTS (Details) - Schedule of Amount, timing and uncertainty of future cash flows [Line Items] |  |
Contract/ notional amount £m | 784,452 | 718,066
Changes in fair value used for calculating hedge ineffectiveness £m | 1,653 | 797
Fair value hedges |  |
DERIVATIVE FINANCIAL INSTRUMENTS (Details) - Schedule of Amount, timing and uncertainty of future cash flows [Line Items] |  |
Contract/ notional amount £m | 211,772 | 231,107
Fair value hedges | Hedging |  |
DERIVATIVE FINANCIAL INSTRUMENTS (Details) - Schedule of Amount, timing and uncertainty of future cash flows [Line Items] |  |
Contract/ notional amount £m | 211,772 | 231,107
Changes in fair value used for calculating hedge ineffectiveness £m | (111) | 1,336
Fair value hedges | Hedging | Currency swaps |  |
DERIVATIVE FINANCIAL INSTRUMENTS (Details) - Schedule of Amount, timing and uncertainty of future cash flows [Line Items] |  |
Contract/ notional amount £m | 35 | 43
Changes in fair value used for calculating hedge ineffectiveness £m | 2 | 0
Fair value hedges | Hedging | Interest rate swaps |  |
DERIVATIVE FINANCIAL INSTRUMENTS (Details) - Schedule of Amount, timing and uncertainty of future cash flows [Line Items] |  |
Contract/ notional amount £m | 211,737 | 231,064
Changes in fair value used for calculating hedge ineffectiveness £m | (113) | 1,336
Cash flow hedges |  |
DERIVATIVE FINANCIAL INSTRUMENTS (Details) - Schedule of Amount, timing and uncertainty of future cash flows [Line Items] |  |
Contract/ notional amount £m | 572,680 | 486,959
Cash flow hedges | Hedging |  |
DERIVATIVE FINANCIAL INSTRUMENTS (Details) - Schedule of Amount, timing and uncertainty of future cash flows [Line Items] |  |
Contract/ notional amount £m | 572,680 | 486,959
Changes in fair value used for calculating hedge ineffectiveness £m | 1,764 | (539)
Cash flow hedges | Hedging | Currency swaps |  |
DERIVATIVE FINANCIAL INSTRUMENTS (Details) - Schedule of Amount, timing and uncertainty of future cash flows [Line Items] |  |
Contract/ notional amount £m | 1,554 | 1,963
Changes in fair value used for calculating hedge ineffectiveness £m | (7) | 61
Cash flow hedges | Hedging | Interest rate swaps |  |
DERIVATIVE FINANCIAL INSTRUMENTS (Details) - Schedule of Amount, timing and uncertainty of future cash flows [Line Items] |  |
Contract/ notional amount £m | 571,126 | 484,996
Changes in fair value used for calculating hedge ineffectiveness £m | 1,771 | (600)
Currency swaps | Fair value hedges |  |
DERIVATIVE FINANCIAL INSTRUMENTS (Details) - Schedule of Amount, timing and uncertainty of future cash flows [Line Items] |  |
Contract/ notional amount £m | 35 | 43
Currency swaps | Cash flow hedges |  |
DERIVATIVE FINANCIAL INSTRUMENTS (Details) - Schedule of Amount, timing and uncertainty of future cash flows [Line Items] |  |
Contract/ notional amount £m | 1,554 | 1,963
Currency swaps | Up to 1 month £m | Fair value hedges |  |
DERIVATIVE FINANCIAL INSTRUMENTS (Details) - Schedule of Amount, timing and uncertainty of future cash flows [Line Items] |  |
Contract/ notional amount £m | £ 0 | £ 0
Average fixed interest rate (in percent) | 0.00% | 0.00%
Currency swaps | Up to 1 month £m | Fair value hedges | Average EUR/GBP exchange rate |  |
DERIVATIVE FINANCIAL INSTRUMENTS (Details) - Schedule of Amount, timing and uncertainty of future cash flows [Line Items] |  |
Average exchange rate | 0 | 0
Currency swaps | Up to 1 month £m | Cash flow hedges |  |
DERIVATIVE FINANCIAL INSTRUMENTS (Details) - Schedule of Amount, timing and uncertainty of future cash flows [Line Items] |  |
Contract/ notional amount £m | £ 152 | £ 107
Currency swaps | Up to 1 month £m | Cash flow hedges | Average EUR/GBP exchange rate |  |
DERIVATIVE FINANCIAL INSTRUMENTS (Details) - Schedule of Amount, timing and uncertainty of future cash flows [Line Items] |  |
Average exchange rate | 1.13 | 1.17
Currency swaps | Up to 1 month £m | Cash flow hedges | Average USD/GBP exchange rate |  |
DERIVATIVE FINANCIAL INSTRUMENTS (Details) - Schedule of Amount, timing and uncertainty of future cash flows [Line Items] |  |
Average exchange rate | 1.33 | 1.30
Currency swaps | 1 to 3 months £m | Fair value hedges |  |
DERIVATIVE FINANCIAL INSTRUMENTS (Details) - Schedule of Amount, timing and uncertainty of future cash flows [Line Items] |  |
Contract/ notional amount £m | £ 0 | £ 0
Average fixed interest rate (in percent) | 0.00% | 0.00%
Currency swaps | 1 to 3 months £m | Fair value hedges | Average EUR/GBP exchange rate |  |
DERIVATIVE FINANCIAL INSTRUMENTS (Details) - Schedule of Amount, timing and uncertainty of future cash flows [Line Items] |  |
Average exchange rate | 0 | 0
Currency swaps | 1 to 3 months £m | Cash flow hedges |  |
DERIVATIVE FINANCIAL INSTRUMENTS (Details) - Schedule of Amount, timing and uncertainty of future cash flows [Line Items] |  |
Contract/ notional amount £m | £ 162 | £ 441
Currency swaps | 1 to 3 months £m | Cash flow hedges | Average EUR/GBP exchange rate |  |
DERIVATIVE FINANCIAL INSTRUMENTS (Details) - Schedule of Amount, timing and uncertainty of future cash flows [Line Items] |  |
Average exchange rate | 1.16 | 1.16
Currency swaps | 1 to 3 months £m | Cash flow hedges | Average USD/GBP exchange rate |  |
DERIVATIVE FINANCIAL INSTRUMENTS (Details) - Schedule of Amount, timing and uncertainty of future cash flows [Line Items] |  |
Average exchange rate | 1.31 | 1.27
Currency swaps | 3 to 12 months £m | Fair value hedges |  |
DERIVATIVE FINANCIAL INSTRUMENTS (Details) - Schedule of Amount, timing and uncertainty of future cash flows [Line Items] |  |
Contract/ notional amount £m | £ 0 | £ 0
Average fixed interest rate (in percent) | 0.00% | 0.00%
Currency swaps | 3 to 12 months £m | Fair value hedges | Average EUR/GBP exchange rate |  |
DERIVATIVE FINANCIAL INSTRUMENTS (Details) - Schedule of Amount, timing and uncertainty of future cash flows [Line Items] |  |
Average exchange rate | 0 | 0
Currency swaps | 3 to 12 months £m | Cash flow hedges |  |
DERIVATIVE FINANCIAL INSTRUMENTS (Details) - Schedule of Amount, timing and uncertainty of future cash flows [Line Items] |  |
Contract/ notional amount £m | £ 157 | £ 646
Currency swaps | 3 to 12 months £m | Cash flow hedges | Average EUR/GBP exchange rate |  |
DERIVATIVE FINANCIAL INSTRUMENTS (Details) - Schedule of Amount, timing and uncertainty of future cash flows [Line Items] |  |
Average exchange rate | 1.14 | 1.15
Currency swaps | 3 to 12 months £m | Cash flow hedges | Average USD/GBP exchange rate |  |
DERIVATIVE FINANCIAL INSTRUMENTS (Details) - Schedule of Amount, timing and uncertainty of future cash flows [Line Items] |  |
Average exchange rate | 1.30 | 1.27
Currency swaps | 1 to 5 years £m | Fair value hedges |  |
DERIVATIVE FINANCIAL INSTRUMENTS (Details) - Schedule of Amount, timing and uncertainty of future cash flows [Line Items] |  |
Contract/ notional amount £m | £ 35 | £ 0
Average fixed interest rate (in percent) | 1.28% | 0.00%
Currency swaps | 1 to 5 years £m | Fair value hedges | Average EUR/GBP exchange rate |  |
DERIVATIVE FINANCIAL INSTRUMENTS (Details) - Schedule of Amount, timing and uncertainty of future cash flows [Line Items] |  |
Average exchange rate | 1.38 | 0
Currency swaps | 1 to 5 years £m | Cash flow hedges |  |
DERIVATIVE FINANCIAL INSTRUMENTS (Details) - Schedule of Amount, timing and uncertainty of future cash flows [Line Items] |  |
Contract/ notional amount £m | £ 884 | £ 763
Currency swaps | 1 to 5 years £m | Cash flow hedges | Average EUR/GBP exchange rate |  |
DERIVATIVE FINANCIAL INSTRUMENTS (Details) - Schedule of Amount, timing and uncertainty of future cash flows [Line Items] |  |
Average exchange rate | 0.98 | 1.10
Currency swaps | 1 to 5 years £m | Cash flow hedges | Average USD/GBP exchange rate |  |
DERIVATIVE FINANCIAL INSTRUMENTS (Details) - Schedule of Amount, timing and uncertainty of future cash flows [Line Items] |  |
Average exchange rate | 1.29 | 1.27
Currency swaps | Over 5 years £m | Fair value hedges |  |
DERIVATIVE FINANCIAL INSTRUMENTS (Details) - Schedule of Amount, timing and uncertainty of future cash flows [Line Items] |  |
Contract/ notional amount £m | £ 0 | £ 43
Average fixed interest rate (in percent) | 0.00% | 1.28%
Currency swaps | Over 5 years £m | Fair value hedges | Average EUR/GBP exchange rate |  |
DERIVATIVE FINANCIAL INSTRUMENTS (Details) - Schedule of Amount, timing and uncertainty of future cash flows [Line Items] |  |
Average exchange rate | 0 | 1.38
Currency swaps | Over 5 years £m | Cash flow hedges |  |
DERIVATIVE FINANCIAL INSTRUMENTS (Details) - Schedule of Amount, timing and uncertainty of future cash flows [Line Items] |  |
Contract/ notional amount £m | £ 199 | £ 6
Currency swaps | Over 5 years £m | Cash flow hedges | Average EUR/GBP exchange rate |  |
DERIVATIVE FINANCIAL INSTRUMENTS (Details) - Schedule of Amount, timing and uncertainty of future cash flows [Line Items] |  |
Average exchange rate | 0.95 | 1.06
Currency swaps | Over 5 years £m | Cash flow hedges | Average USD/GBP exchange rate |  |
DERIVATIVE FINANCIAL INSTRUMENTS (Details) - Schedule of Amount, timing and uncertainty of future cash flows [Line Items] |  |
Average exchange rate | 0 | 1.30
Interest rate swaps | Fair value hedges |  |
DERIVATIVE FINANCIAL INSTRUMENTS (Details) - Schedule of Amount, timing and uncertainty of future cash flows [Line Items] |  |
Contract/ notional amount £m | £ 211,737 | £ 231,064
Interest rate swaps | Cash flow hedges |  |
DERIVATIVE FINANCIAL INSTRUMENTS (Details) - Schedule of Amount, timing and uncertainty of future cash flows [Line Items] |  |
Contract/ notional amount £m | 571,126 | 484,996
Interest rate swaps | Up to 1 month £m | Fair value hedges |  |
DERIVATIVE FINANCIAL INSTRUMENTS (Details) - Schedule of Amount, timing and uncertainty of future cash flows [Line Items] |  |
Contract/ notional amount £m | £ 395 | £ 5,236
Average fixed interest rate (in percent) | 3.00% | 3.04%
Interest rate swaps | Up to 1 month £m | Cash flow hedges |  |
DERIVATIVE FINANCIAL INSTRUMENTS (Details) - Schedule of Amount, timing and uncertainty of future cash flows [Line Items] |  |
Contract/ notional amount £m | £ 12,636 | £ 9,195
Average fixed interest rate (in percent) | 4.03% | 4.32%
Interest rate swaps | 1 to 3 months £m | Fair value hedges |  |
DERIVATIVE FINANCIAL INSTRUMENTS (Details) - Schedule of Amount, timing and uncertainty of future cash flows [Line Items] |  |
Contract/ notional amount £m | £ 5,503 | £ 13,781
Average fixed interest rate (in percent) | 3.24% | 3.68%
Interest rate swaps | 1 to 3 months £m | Cash flow hedges |  |
DERIVATIVE FINANCIAL INSTRUMENTS (Details) - Schedule of Amount, timing and uncertainty of future cash flows [Line Items] |  |
Contract/ notional amount £m | £ 31,911 | £ 21,010
Average fixed interest rate (in percent) | 3.43% | 4.36%
Interest rate swaps | 3 to 12 months £m | Fair value hedges |  |
DERIVATIVE FINANCIAL INSTRUMENTS (Details) - Schedule of Amount, timing and uncertainty of future cash flows [Line Items] |  |
Contract/ notional amount £m | £ 31,294 | £ 55,607
Average fixed interest rate (in percent) | 3.70% | 4.04%
Interest rate swaps | 3 to 12 months £m | Cash flow hedges |  |
DERIVATIVE FINANCIAL INSTRUMENTS (Details) - Schedule of Amount, timing and uncertainty of future cash flows [Line Items] |  |
Contract/ notional amount £m | £ 114,577 | £ 129,436
Average fixed interest rate (in percent) | 3.65% | 3.84%
Interest rate swaps | 1 to 5 years £m | Fair value hedges |  |
DERIVATIVE FINANCIAL INSTRUMENTS (Details) - Schedule of Amount, timing and uncertainty of future cash flows [Line Items] |  |
Contract/ notional amount £m | £ 132,417 | £ 111,300
Average fixed interest rate (in percent) | 3.33% | 3.36%
Interest rate swaps | 1 to 5 years £m | Cash flow hedges |  |
DERIVATIVE FINANCIAL INSTRUMENTS (Details) - Schedule of Amount, timing and uncertainty of future cash flows [Line Items] |  |
Contract/ notional amount £m | £ 321,862 | £ 262,387
Average fixed interest rate (in percent) | 3.59% | 3.34%
Interest rate swaps | Over 5 years £m | Fair value hedges |  |
DERIVATIVE FINANCIAL INSTRUMENTS (Details) - Schedule of Amount, timing and uncertainty of future cash flows [Line Items] |  |
Contract/ notional amount £m | £ 42,128 | £ 45,140
Average fixed interest rate (in percent) | 1.96% | 2.27%
Interest rate swaps | Over 5 years £m | Cash flow hedges |  |
DERIVATIVE FINANCIAL INSTRUMENTS (Details) - Schedule of Amount, timing and uncertainty of future cash flows [Line Items] |  |
Contract/ notional amount £m | £ 90,140 | £ 62,968
Average fixed interest rate (in percent) | 3.56% | 3.01%

X
- Definition The gain (loss) on the change in fair value of the hedged item used as a basis for recognising hedge ineffectiveness. Hedge ineffectiveness is the extent to which the changes in the fair value or the cash flows of the hedging instrument are greater or less than those on the hedged item. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 61 -Subparagraph a -Clause iv -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_61_a_iv&doctype=Standard -URIDate 2025-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 61 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_61_b&doctype=Standard -URIDate 2025-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2025-01-01 -Paragraph 24B -Subparagraph a -Clause iv -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_24B_a_iv&doctype=Standard -URIDate 2025-03-27 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2025-01-01 -Paragraph 24B -Subparagraph b -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_24B_b_i&doctype=Standard -URIDate 2025-03-27 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 61 -Subparagraph a -Clause iv -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_61_a_iv&doctype=Standard -URIDate 2025-03-27 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 61 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_61_b&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The nominal or face amount of a financial instrument, used to calculate payments made on that instrument. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Note Expiry date 2027-01-01 -Name IAS -Number 1 -IssueDate 2025-01-01 -Paragraph 112 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_112_c&doctype=Standard -URIDate 2025-03-27 + Details
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