v3.25.4

Retirement benefit obligations - Narrative (Details) - GBP (£) £ in Millions |  | 12 Months Ended | 72 Months Ended
--- | --- | --- | ---
Jan. 01, 2026 | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2030
RETIREMENT BENEFIT OBLIGATIONS (Details) - Narrative [Line Items] |  |  |  |  |  |  |
Defined benefit asset |  | £ 2,575 | £ 2,906 |  |  |  |
Retirement benefit assets |  | 2,695 | 3,028 |  |  |  |
Retirement benefit obligations |  | 120 | £ 122 |  |  |  |
Estimate of contributions expected to be paid to plan for next annual reporting period |  | 100 |  |  |  |  |
Security arrangements assets held |  | £ 4,000 |  |  |  |  |
Actuarial assumption of mortality rate - sensitivity of mortality experience |  |  | 15.00% | 15.00% | 0.00% | 0.00% |
Three most significant schemes, percentage of total defined benefit obligations (in percent) |  | 90.00% |  |  |  |  |
Actuarial assumption of retirement age |  | 60 years |  |  |  |  |
Share of scheme assets invested in bonds, fixed interest gilts, index linked gilts and interest rate and inflation swaps |  | 47.00% |  |  |  |  |
Asset-liability matching strategy, liability sensitivity to interest rate movements (in percent) |  | 110.00% |  |  |  |  |
Asset-liability matching strategy, liability sensitivity to inflation movements (in percent) |  | 130.00% |  |  |  |  |
Hedged percent of exposure to increases in life expectancy (in percent) |  | 60.00% |  |  |  |  |
Derivative financial instruments |  | £ 19,727 | £ 24,065 |  |  |  |
Defined contribution pension schemes |  | £ 564 | £ 537 | £ 434 |  |  |
Healthcare premiums |  |  |  |  |  |  |
RETIREMENT BENEFIT OBLIGATIONS (Details) - Narrative [Line Items] |  |  |  |  |  |  |
Percentage of reasonably possible increase in actuarial assumption (in percent) |  | 10.00% | 10.00% |  |  |  |
Forecast |  |  |  |  |  |  |
RETIREMENT BENEFIT OBLIGATIONS (Details) - Narrative [Line Items] |  |  |  |  |  |  |
Gap between RPI and CPI (in basis points) | 0.20% |  |  |  |  |  | 1.00%
Defined benefit pension schemes |  |  |  |  |  |  |
RETIREMENT BENEFIT OBLIGATIONS (Details) - Narrative [Line Items] |  |  |  |  |  |  |
Defined benefit asset |  | £ 2,612 | £ 2,945 | £ 3,532 |  |  |
Retirement benefit assets |  | 2,695 | 3,028 |  |  |  |
Retirement benefit obligations |  | £ 83 | £ 83 |  |  |  |
The group's three main schemes |  |  |  |  |  |  |
RETIREMENT BENEFIT OBLIGATIONS (Details) - Narrative [Line Items] |  |  |  |  |  |  |
Percentage of gross defined benefit pension assets (in percent) |  | 94.00% | 94.00% |  |  |  |
The group's three main schemes | Swap contract |  |  |  |  |  |  |
RETIREMENT BENEFIT OBLIGATIONS (Details) - Narrative [Line Items] |  |  |  |  |  |  |
Derivative financial instruments |  | £ (217) |  |  |  |  |

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- Definition The retirement age used as a significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit obligation, at present value; Actuarial assumptions [domain]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2025-01-01 -Paragraph 144 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2025-en-r&anchor=para_144&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The estimate of the expected contributions to be made to a defined benefit plan for the next annual reporting period. [Refer: Defined benefit plans [domain]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2025-01-01 -Paragraph 147 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2025-en-r&anchor=para_147_b&doctype=Standard -URIDate 2025-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2025-01-01 -Paragraph 148 -Subparagraph d -Clause iii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2025-en-r&anchor=para_148_d_iii&doctype=Standard -URIDate 2025-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 211 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_211_b&doctype=Standard -URIDate 2025-03-27 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 211 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_211_b&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The amount of deficit or surplus in a defined benefit plan, adjusted for any effect of limiting a net defined benefit asset to the asset ceiling. [Refer: Defined benefit plans [domain]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2025-01-01 -Paragraph 140 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2025-en-r&anchor=para_140_a&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 206 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_206_a&doctype=Standard -URIDate 2025-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 206 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_206_a&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The reasonably possible percentage of the increase in the actuarial assumption used to determine the present value of defined benefit obligation. [Refer: Actuarial assumptions [domain]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2025-01-01 -Paragraph 145 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2025-en-r&anchor=para_145_a&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The amount of surplus in a defined benefit plan, adjusted for any effect of limiting a net defined benefit asset to the asset ceiling. [Refer: Defined benefit plans [domain]] + 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 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_55&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The amount of deficit in a defined benefit plan. [Refer: Defined benefit plans [domain]] + 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 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_55&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition Hedged Percent Of Defined Benefit Scheme Exposure To Increases Life Expectancy + References No definition available. + Details
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- Definition Share Of Scheme Assets Invested In Bonds, Fixed Interest Gilts, Index Linked Gilts And Interest Rate And Inflation Swaps + References No definition available. + Details
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- Definition Three Most Significant Defined Benefit Schemes, Percentage Of Total Defined Benefit Obligations + References No definition available. + Details
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