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 |
909,000,000
GBP
|
828,000,000
GBP
|
| Intangible assets and goodwill [abstract] | ||
| Intangible assets other than goodwill [abstract] | ||
| Intangible assets other than goodwill |
737,000,000
GBP
|
8 50
GBP
|
| Goodwill |
7, 6 1 0
GBP
|
8 ,3 89
GBP
|
| Investments accounted for using equity method [abstract] | ||
| Investments accounted for using equity method |
253,000,000
GBP
|
287,000,000
GBP
|
| Trade and other non-current receivables [abstract] | ||
| Trade and other non-current receivables |
1 74
GBP
|
209,000,000
GBP
|
| Trade and other current receivables [abstract] | ||
| Trade and other current receivables |
7, 7 2 2
GBP
|
8,4 60
GBP
|
| Current prepayments and current accrued income including current contract assets [abstract] | ||
| Current accrued income including current contract assets [abstract] | ||
| Current accrued income including current contract assets |
3,1 8 8
GBP
|
3, 151
GBP
|
| Cash and cash equivalents [abstract] | ||
| Cash and cash equivalents |
2 ,638
GBP
|
2,218,000,000
GBP
|
| Miscellaneous assets [abstract] | ||
| Investments other than investments accounted for using equity method |
398,000,000
GBP
|
333,000,000
GBP
|
| Borrowings [abstract] | ||
| Non-current portion of non-current borrowings |
3 , 74 4
GBP
|
3,7 75
GBP
|
| Current borrowings and current portion of non-current borrowings [abstract] | ||
| Current borrowings |
5 8 4
GBP
|
9 4 6
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 9
GBP
|
28 3
GBP
|
| Trade and other current payables [abstract] | ||
| Current accruals and current deferred income including current contract liabilities [abstract] | ||
| Current deferred income including current contract liabilities [abstract] | ||
| Current deferred income including current contract liabilities |
1 ,16 0
GBP
|
1, 3 1 9
GBP
|
| Trade and other current payables |
13 ,0 56
GBP
|
13, 323
GBP
|
| Miscellaneous non-current liabilities [abstract] | ||
| Non-current net defined benefit liability |
1 32
GBP
|
1 36
GBP
|
| Issued capital [abstract] | ||
| Issued capital |
109,000,000
GBP
|
114,000,000
GBP
|
| Retained earnings [abstract] | ||
| Retained earnings |
2,827,000,000
GBP
|
3,488,000,000
GBP
|
| Net assets (liabilities) [abstract] | ||
| Assets (liabilities) |
3,734,000,000
GBP
|
3,8 33
GBP
|
| Net current assets (liabilities) [abstract] | ||
| Current assets |
13,66 1
GBP
|
1 3 ,94 4
GBP
|
| Current liabilities |
1 5, 51 6
GBP
|
16, 30 5
GBP
|
| Current assets (liabilities) |
1, 855
GBP
|
2, 361
GBP
|
| Assets less current liabilities [abstract] |