Subclassifications Of Assets, Liabilities And Equities [Abstract]
| Concept |
As at 2024-03-31 |
As at 2023-03-31 |
|---|---|---|
| Subclassifications of assets, liabilities and equities [abstract] | ||
| Property, plant and equipment [abstract] | ||
| Property, plant and equipment |
1,436,000,000
GBP
|
1,332,000,000
GBP
|
| Intangible assets and goodwill [abstract] | ||
| Intangible assets other than goodwill [abstract] | ||
| Intangible assets other than goodwill |
301,000,000
GBP
|
287,000,000
GBP
|
| Goodwill |
353,000,000
GBP
|
364,000,000
GBP
|
| Investments accounted for using equity method [abstract] | ||
| Investments accounted for using equity method |
71,000,000
GBP
|
75,000,000
GBP
|
| Trade and other non-current receivables [abstract] | ||
| Other non-current receivables |
104,000,000
GBP
|
113,000,000
GBP
|
| Miscellaneous non-current assets [abstract] | ||
| Non-current net defined benefit asset |
153,000,000
GBP
|
203,000,000
GBP
|
| Non-current derivative financial assets |
15,000,000
GBP
|
20,000,000
GBP
|
| Trade and other current receivables [abstract] | ||
| Trade and other current receivables |
1,718,000,000
GBP
|
1,882,000,000
GBP
|
| Categories of non-current financial assets [abstract] | ||
| Non-current financial assets at fair value through other comprehensive income [abstract] | ||
| Non-current financial assets at fair value through other comprehensive income |
40,000,000
GBP
|
49,000,000
GBP
|
| Classes of current inventories [abstract] | ||
| Current inventories |
1,211,000,000
GBP
|
1,702,000,000
GBP
|
| Classes of current inventories, alternative [abstract] | ||
| Cash and cash equivalents [abstract] | ||
| Cash [abstract] | ||
| Cash |
208,000,000
GBP
|
129,000,000
GBP
|
| Cash and cash equivalents |
542,000,000
GBP
|
650,000,000
GBP
|
| Non-current assets or disposal groups classified as held for sale or as held for distribution to owners [abstract] | ||
| Non-current assets or disposal groups classified as held for sale |
127,000,000
GBP
|
75,000,000
GBP
|
| Trade and other non-current payables [abstract] | ||
| Other non-current payables |
2,000,000
GBP
|
2,000,000
GBP
|
| Trade and other current payables [abstract] | ||
| Trade and other current payables |
2,209,000,000
GBP
|
2,497,000,000
GBP
|
| Miscellaneous non-current liabilities [abstract] | ||
| Non-current net defined benefit liability |
39,000,000
GBP
|
41,000,000
GBP
|
| Non-current derivative financial liabilities |
10,000,000
GBP
|
15,000,000
GBP
|
| Issued capital [abstract] | ||
| Issued capital |
215,000,000
GBP
|
215,000,000
GBP
|
| Retained earnings [abstract] | ||
| Retained earnings |
1,998,000,000
GBP
|
2,077,000,000
GBP
|
| Net assets (liabilities) [abstract] | ||
| Assets |
6,336,000,000
GBP
|
7,029,000,000
GBP
|
| Liabilities |
3,956,000,000
GBP
|
4,490,000,000
GBP
|
| Assets (liabilities) |
2,380,000,000
GBP
|
2,539,000,000
GBP
|
| Net current assets (liabilities) [abstract] | ||
| Current assets |
3,661,000,000
GBP
|
4,368,000,000
GBP
|
| Current liabilities |
2,523,000,000
GBP
|
2,894,000,000
GBP
|
| Assets less current liabilities [abstract] |