Subclassifications Of Assets, Liabilities And Equities [Abstract]
| Concept |
As at 2023-12-31 |
As at 2022-12-31 |
|---|---|---|
| Subclassifications of assets, liabilities and equities [abstract] | ||
| Property, plant and equipment [abstract] | ||
| Property, plant and equipment |
777,000,000
GBP
|
2,599,000,000
GBP
|
| Intangible assets and goodwill [abstract] | ||
| Intangible assets and goodwill |
3,351,000,000
GBP
|
6,846,000,000
GBP
|
| Investments accounted for using equity method [abstract] | ||
| Investments accounted for using equity method |
114,000,000
GBP
|
62,000,000
GBP
|
| Trade and other non-current receivables [abstract] | ||
| Other non-current receivables |
789,000,000
GBP
|
670,000,000
GBP
|
| Miscellaneous non-current assets [abstract] | ||
| Non-current derivative financial assets |
46,000,000
GBP
|
36,000,000
GBP
|
| Trade and other current receivables [abstract] | ||
| Trade and other current receivables |
713,000,000
GBP
|
1,426,000,000
GBP
|
| Classes of current inventories [abstract] | ||
| Current inventories |
510,000,000
GBP
|
1,025,000,000
GBP
|
| Classes of current inventories, alternative [abstract] | ||
| Cash and cash equivalents [abstract] | ||
| Cash and cash equivalents |
58,000,000
GBP
|
355,000,000
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 or as held for distribution to owners |
18,000,000
GBP
|
–
GBP
|
| Miscellaneous current assets [abstract] | ||
| Current derivative financial assets |
13,000,000
GBP
|
38,000,000
GBP
|
| Miscellaneous assets [abstract] | ||
| Net defined benefit asset |
–
GBP
|
93,000,000
GBP
|
| Borrowings [abstract] | ||
| Non-current portion of non-current borrowings |
576,000,000
GBP
|
1,433,000,000
GBP
|
| Current borrowings and current portion of non-current borrowings [abstract] | ||
| Current borrowings |
54,000,000
GBP
|
63,000,000
GBP
|
| Non-current portion of non-current borrowings, by type [abstract] | ||
| Trade and other non-current payables [abstract] | ||
| Other non-current payables |
358,000,000
GBP
|
431,000,000
GBP
|
| Trade and other current payables [abstract] | ||
| Trade and other current payables |
1,179,000,000
GBP
|
2,347,000,000
GBP
|
| Miscellaneous non-current liabilities [abstract] | ||
| Non-current net defined benefit liability |
99,000,000
GBP
|
581,000,000
GBP
|
| Non-current derivative financial liabilities |
64,000,000
GBP
|
141,000,000
GBP
|
| Miscellaneous current liabilities [abstract] | ||
| Current derivative financial liabilities |
42,000,000
GBP
|
86,000,000
GBP
|
| Issued capital [abstract] | ||
| Issued capital |
309,000,000
GBP
|
309,000,000
GBP
|
| Retained earnings [abstract] | ||
| Retained earnings |
1,182,000,000
GBP
|
4,379,000,000
GBP
|
| Accumulated other comprehensive income [abstract] | ||
| Reserve of exchange differences on translation |
273,000,000
GBP
|
638,000,000
GBP
|
| Miscellaneous equity [abstract] | ||
| Capital redemption reserve |
753,000,000
GBP
|
753,000,000
GBP
|
| Merger reserve |
109,000,000
GBP
|
109,000,000
GBP
|
| Net assets (liabilities) [abstract] | ||
| Assets |
6,929,000,000
GBP
|
13,987,000,000
GBP
|
| Liabilities |
3,362,000,000
GBP
|
6,819,000,000
GBP
|
| Assets (liabilities) |
3,567,000,000
GBP
|
7,168,000,000
GBP
|
| Net current assets (liabilities) [abstract] | ||
| Current assets |
1,318,000,000
GBP
|
2,873,000,000
GBP
|
| Current liabilities |
1,533,000,000
GBP
|
2,978,000,000
GBP
|
| Current assets (liabilities) |
215,000,000
GBP
|
105,000,000
GBP
|
| Assets less current liabilities [abstract] | ||
| Net debt |
572,000,000
GBP
|
1,139,000,000
GBP
|