Pensions and other post-retirement benefits - Schedule of reconciliation of the net defined benefit asset (Details) - GBP (£) £ in Millions |
6 Months Ended | |
|---|---|---|
Sep. 30, 2026 |
Sep. 30, 2025 |
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| Changes in net defined benefit liability (asset) | ||
| Net defined benefit asset at 1 April | £ 2,147 | £ 1,916 |
| Cost recognised in the income statement | (16) | (25) |
| Employer contributions | 45 | 62 |
| Remeasurements and foreign exchange | 353 | 260 |
| Other movements | 0 | 2 |
| Movements on restrictions on asset recognised | (238) | (140) |
| Net defined benefit asset at 30 September | £ 2,291 | £ 2,075 |
| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition The decrease (increase) in net defined benefit liability (asset) resulting from contributions to a defined benefit plan by the employer. [Refer: Net defined benefit liability (asset); Defined benefit plans [domain]] Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition The decrease (increase) in a net defined benefit liability (asset) resulting from the remeasurement of that net defined benefit liability (asset). [Refer: Net defined benefit liability (asset)] Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from changes that the entity does not separately disclose in the same statement or note. [Refer: Net defined benefit liability (asset)] Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- 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]] Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Adjustments For Restrictions On Defined Benefit Asset No definition available.
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