Subclassifications Of Assets, Liabilities And Equities [Abstract]
| Concept |
As at 2024-12-31 |
As at 2023-12-31 |
|---|---|---|
| Subclassifications of assets, liabilities and equities [abstract] | ||
| Property, plant and equipment [abstract] | ||
| Property, plant and equipment |
80,000,000
GBP
|
92,000,000
GBP
|
| Intangible assets and goodwill [abstract] | ||
| Intangible assets other than goodwill [abstract] | ||
| Other intangible assets |
134,000,000
GBP
|
110,000,000
GBP
|
| Investment property [abstract] | ||
| Investment property |
3,000,000
GBP
|
12,000,000
GBP
|
| Investments in subsidiaries, joint ventures and associates reported in separate financial statements [abstract] | ||
| Investments in joint ventures reported in separate financial statements |
31,000,000
GBP
|
38,000,000
GBP
|
| Investments in associates reported in separate financial statements |
49,000,000
GBP
|
51,000,000
GBP
|
| Trade and other non-current receivables [abstract] | ||
| Trade and other non-current receivables |
27,000,000
GBP
|
33,000,000
GBP
|
| Miscellaneous non-current assets [abstract] | ||
| Non-current net defined benefit asset |
2,000,000
GBP
|
3,000,000
GBP
|
| Non-current investments other than investments accounted for using equity method |
18,000,000
GBP
|
19,000,000
GBP
|
| Trade and other current receivables [abstract] | ||
| Trade and other current receivables |
2, 998
GBP
|
2,279,000,000
GBP
|
| Categories of current financial assets [abstract] | ||
| Current financial assets at fair value through profit or loss [abstract] | ||
| Current financial assets at fair value through profit or loss |
171,000,000
GBP
|
5 69
GBP
|
| Current financial assets |
160,000,000
GBP
|
189,000,000
GBP
|
| Cash and cash equivalents [abstract] | ||
| Cash and cash equivalents |
1,0 68
GBP
|
1,0 2 9
GBP
|
| Borrowings [abstract] | ||
| Non-current portion of non-current borrowings |
74 4
GBP
|
74 4
GBP
|
| Current borrowings and current portion of non-current borrowings [abstract] | ||
| Current borrowings |
9,000,000
GBP
|
93,000,000
GBP
|
| Non-current portion of non-current borrowings, by type [abstract] | ||
| Trade and other non-current payables [abstract] | ||
| Trade and other non-current payables |
22,000,000
GBP
|
5,000,000
GBP
|
| Trade and other current payables [abstract] | ||
| Trade and other current payables |
3, 067
GBP
|
2,372,000,000
GBP
|
| Categories of current financial liabilities [abstract] | ||
| Current financial liabilities at fair value through profit or loss [abstract] | ||
| Current financial liabilities at fair value through profit or loss |
189,000,000
GBP
|
5 41
GBP
|
| Miscellaneous non-current liabilities [abstract] | ||
| Non-current net defined benefit liability |
3,000,000
GBP
|
4,000,000
GBP
|
| Issued capital [abstract] | ||
| Issued capital |
199,000,000
GBP
|
197,000,000
GBP
|
| Retained earnings [abstract] | ||
| Retained earnings |
2, 910
GBP
|
2,814,000,000
GBP
|
| Net assets (liabilities) [abstract] | ||
| Assets |
6, 447
GBP
|
6 ,206
GBP
|
| Liabilities |
4,369,000,000
GBP
|
4, 141
GBP
|
| Assets (liabilities) |
2 ,0 7 8
GBP
|
2, 065
GBP
|
| Net current assets (liabilities) [abstract] | ||
| Current assets |
4 ,397
GBP
|
4 ,0 6 6
GBP
|
| Current liabilities |
3,352,000,000
GBP
|
3 ,0 8 3
GBP
|
| Current assets (liabilities) |
1,0 4 5
GBP
|
983,000,000
GBP
|
| Assets less current liabilities [abstract] |