v3.24.1.1.u2
Pensions and other post-retirement benefits - Disclosure of amounts recognised in the income statement and statement of other comprehensive income (Details) - GBP (£)
£ in Millions
 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2022
Included within operating costs      
Administration costs £ 22 £ 19 £ 20
Defined benefit plan costs:      
Current service cost 143 194 223
Past service cost – augmentations and redundancies 9 8 11
Gains on settlement (30) (45) 0
Post-employment benefit expense, payroll cost, defined benefit plans 122 157 234
Included within finance income and costs      
Net interest (income)/cost (100) (85) (2)
Total included in income statement 44 91 252
Remeasurement (losses)/gains of pension assets and post-retirement benefit obligations (218) (1,364) 2,481
Exchange adjustments (6) 41 7
Total included in the statement of other comprehensive income (224) (1,323) 2,488
Discontinued operations      
Included within operating costs      
Administration costs 0 0 4
Included within finance income and costs      
Net interest (income)/cost 0 0 (2)
Total included in income statement 0 0 10
Total included in the statement of other comprehensive income 0 0 309
Pensions | UK      
Included within operating costs      
Administration costs 13 9 11
Defined benefit plan costs:      
Current service cost 45 69 83
Past service cost – augmentations and redundancies 9 8 11
Gains on settlement 0 0 0
Post-employment benefit expense, payroll cost, defined benefit plans 54 77 94
Included within finance income and costs      
Net interest (income)/cost (84) (64) (7)
Total included in income statement (17) 22 98
Remeasurement (losses)/gains of pension assets and post-retirement benefit obligations (474) (1,183) 1,577
Exchange adjustments 0 0 0
Total included in the statement of other comprehensive income (474) (1,183) 1,577
Pensions | US      
Included within operating costs      
Administration costs 7 8 7
Defined benefit plan costs:      
Current service cost 72 88 101
Past service cost – augmentations and redundancies 0 0 0
Gains on settlement (30) (45) 0
Post-employment benefit expense, payroll cost, defined benefit plans 42 43 101
Included within finance income and costs      
Net interest (income)/cost (13) (21) 0
Total included in income statement 36 30 108
Remeasurement (losses)/gains of pension assets and post-retirement benefit obligations 99 (242) 532
Exchange adjustments (5) 36 11
Total included in the statement of other comprehensive income 94 (206) 543
Other post-retirement benefits | US      
Included within operating costs      
Administration costs 2 2 2
Defined benefit plan costs:      
Current service cost 26 37 39
Past service cost – augmentations and redundancies 0 0 0
Gains on settlement 0 0 0
Post-employment benefit expense, payroll cost, defined benefit plans 26 37 39
Included within finance income and costs      
Net interest (income)/cost (3) 0 5
Total included in income statement 25 39 46
Remeasurement (losses)/gains of pension assets and post-retirement benefit obligations 157 61 372
Exchange adjustments (1) 5 (4)
Total included in the statement of other comprehensive income £ 156 £ 66 £ 368