Subclassifications Of Assets, Liabilities And Equities [Abstract]
| Concept |
As at 2023-03-31 |
As at 2022-03-31 |
|---|---|---|
| Subclassifications of assets, liabilities and equities [abstract] | ||
| Property, plant and equipment [abstract] | ||
| Property, plant and equipment |
1,332,000,000
GBP
|
1,238,000,000
GBP
|
| Intangible assets and goodwill [abstract] | ||
| Intangible assets other than goodwill [abstract] | ||
| Intangible assets other than goodwill |
287,000,000
GBP
|
267,000,000
GBP
|
| Goodwill |
364,000,000
GBP
|
366,000,000
GBP
|
| Investments accounted for using equity method [abstract] | ||
| Investments accounted for using equity method |
75,000,000
GBP
|
2,000,000
GBP
|
| Trade and other non-current receivables [abstract] | ||
| Other non-current receivables |
113,000,000
GBP
|
42,000,000
GBP
|
| Miscellaneous non-current assets [abstract] | ||
| Non-current net defined benefit asset |
203,000,000
GBP
|
352,000,000
GBP
|
| Non-current derivative financial assets |
20,000,000
GBP
|
12,000,000
GBP
|
| Trade and other current receivables [abstract] | ||
| Trade and other current receivables |
1,882,000,000
GBP
|
1,796,000,000
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 |
49,000,000
GBP
|
45,000,000
GBP
|
| Classes of current inventories [abstract] | ||
| Current inventories |
1,702,000,000
GBP
|
1,549,000,000
GBP
|
| Classes of current inventories, alternative [abstract] | ||
| Cash and cash equivalents [abstract] | ||
| Cash [abstract] | ||
| Cash |
129,000,000
GBP
|
254,000,000
GBP
|
| Cash and cash equivalents |
650,000,000
GBP
|
391,000,000
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 |
75,000,000
GBP
|
402,000,000
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 |
2,497,000,000
GBP
|
2,563,000,000
GBP
|
| Miscellaneous non-current liabilities [abstract] | ||
| Non-current net defined benefit liability |
4 1
GBP
|
72,000,000
GBP
|
| Non-current derivative financial liabilities |
15,000,000
GBP
|
2,000,000
GBP
|
| Issued capital [abstract] | ||
| Issued capital |
215,000,000
GBP
|
218,000,000
GBP
|
| Retained earnings [abstract] | ||
| Retained earnings |
2,077,000,000
GBP
|
2,049,000,000
GBP
|
| Net assets (liabilities) [abstract] | ||
| Assets |
7,029,000,000
GBP
|
6,666,000,000
GBP
|
| Liabilities |
4,490,000,000
GBP
|
4,225,000,000
GBP
|
| Assets (liabilities) |
2,539,000,000
GBP
|
2,441,000,000
GBP
|
| Net current assets (liabilities) [abstract] | ||
| Current assets |
4,368,000,000
GBP
|
4,183,000,000
GBP
|
| Current liabilities |
2,894,000,000
GBP
|
3,152,000,000
GBP
|
| Assets less current liabilities [abstract] |