Subclassifications Of Assets, Liabilities And Equities [Abstract]
| Concept |
As at 2022-03-31 |
As at 2021-03-31 |
|---|---|---|
| Subclassifications of assets, liabilities and equities [abstract] | ||
| Property, plant and equipment [abstract] | ||
| Property, plant and equipment |
1,238,000,000
GBP
|
1,424,000,000
GBP
|
| Intangible assets and goodwill [abstract] | ||
| Intangible assets other than goodwill [abstract] | ||
| Intangible assets other than goodwill |
267,000,000
GBP
|
359,000,000
GBP
|
| Goodwill |
366,000,000
GBP
|
554,000,000
GBP
|
| Investments in subsidiaries, joint ventures and associates reported in separate financial statements [abstract] | ||
| Investments in subsidiaries reported in separate financial statements |
–
GBP
|
–
GBP
|
| Investments accounted for using equity method [abstract] | ||
| Investments accounted for using equity method |
2,000,000
GBP
|
2,000,000
GBP
|
| Trade and other non-current receivables [abstract] | ||
| Other non-current receivables |
42,000,000
GBP
|
50,000,000
GBP
|
| Miscellaneous non-current assets [abstract] | ||
| Non-current net defined benefit asset |
352,000,000
GBP
|
194,000,000
GBP
|
| Non-current derivative financial assets |
11,000,000
GBP
|
20,000,000
GBP
|
| Trade and other current receivables [abstract] | ||
| Trade and other current receivables |
1,796,000,000
GBP
|
2,422,000,000
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 |
45,000,000
GBP
|
53,000,000
GBP
|
| Classes of current inventories [abstract] | ||
| Current inventories |
1,549,000,000
GBP
|
1,814,000,000
GBP
|
| Classes of current inventories, alternative [abstract] | ||
| Cash and cash equivalents [abstract] | ||
| Cash [abstract] | ||
| Cash |
254,000,000
GBP
|
119,000,000
GBP
|
| Cash and cash equivalents |
391,000,000
GBP
|
581,000,000
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 |
402,000,000
GBP
|
–
GBP
|
| Miscellaneous current assets [abstract] | ||
| Current derivative financial assets |
1,000,000
GBP
|
–
GBP
|
| Trade and other non-current payables [abstract] | ||
| Other non-current payables |
2,000,000
GBP
|
5,000,000
GBP
|
| Trade and other current payables [abstract] | ||
| Trade and other current payables |
2,563,000,000
GBP
|
3,325,000,000
GBP
|
| Miscellaneous non-current liabilities [abstract] | ||
| Non-current net defined benefit liability |
72,000,000
GBP
|
98,000,000
GBP
|
| Non-current derivative financial liabilities |
2,000,000
GBP
|
–
GBP
|
| Issued capital [abstract] | ||
| Issued capital |
218,000,000
GBP
|
221,000,000
GBP
|
| Retained earnings [abstract] | ||
| Retained earnings |
2,049,000,000
GBP
|
2,345,000,000
GBP
|
| Miscellaneous equity [abstract] | ||
| Reserve of share-based payments |
24,000,000
GBP
|
2 9
GBP
|
| Net assets (liabilities) [abstract] | ||
| Assets |
6,666,000,000
GBP
|
7,744,000,000
GBP
|
| Liabilities |
4,225,000,000
GBP
|
5,059,000,000
GBP
|
| Assets (liabilities) |
2,441,000,000
GBP
|
2,685,000,000
GBP
|
| Net current assets (liabilities) [abstract] | ||
| Current assets |
4,184,000,000
GBP
|
4,874,000,000
GBP
|
| Current liabilities |
3,152,000,000
GBP
|
3,598,000,000
GBP
|
| Assets less current liabilities [abstract] |