Subclassifications Of Assets, Liabilities And Equities [Abstract]
| Concept |
As at 2023-12-31 |
As at 2022-12-31 |
As at 2021-12-31 |
|---|---|---|---|
| Subclassifications of assets, liabilities and equities [abstract] | |||
| Property, plant and equipment [abstract] | |||
| Property, plant and equipment |
3,635,000,000
GBP
|
3,235,000,000
GBP
|
— |
| Intangible assets and goodwill [abstract] | |||
| Intangible assets and goodwill |
12 , 0 9 9
GBP
|
12 , 6 4 4
GBP
|
— |
| Investment property [abstract] | |||
| Investment property |
57,000,000
GBP
|
63,000,000
GBP
|
— |
| Investments accounted for using equity method [abstract] | |||
| Investments accounted for using equity method |
832,000,000
GBP
|
787,000,000
GBP
|
— |
| Trade and other non-current receivables [abstract] | |||
| Other non-current receivables |
6 33
GBP
|
618,000,000
GBP
|
— |
| Miscellaneous non-current assets [abstract] | |||
| Non-current net defined benefit asset |
804,000,000
GBP
|
1, 2 9 7
GBP
|
— |
| Non-current investments other than investments accounted for using equity method |
84,000,000
GBP
|
99,000,000
GBP
|
— |
| Classes of current inventories [abstract] | |||
| Current inventories |
1 ,1 5 6
GBP
|
976,000,000
GBP
|
— |
| Classes of current inventories, alternative [abstract] | |||
| Cash and cash equivalents [abstract] | |||
| Cash and cash equivalents |
4, 067
GBP
|
3 ,1 0 7
GBP
|
2 , 9 17
GBP
|
| Borrowings [abstract] | |||
| Non-current portion of non-current borrowings |
4 , 4 32
GBP
|
5, 189
GBP
|
— |
| Current borrowings and current portion of non-current borrowings [abstract] | |||
| Current borrowings |
679,000,000
GBP
|
53,000,000
GBP
|
— |
| Non-current portion of non-current borrowings, by type [abstract] | |||
| Trade and other non-current payables [abstract] | |||
| Non-current accruals and non-current deferred income including non-current contract liabilities [abstract] | |||
| Non-current deferred income including non-current contract liabilities [abstract] | |||
| Non-current contract liabilities [abstract] | |||
| Non-current contract liabilities |
1 , 9 5 5
GBP
|
9 45
GBP
|
— |
| Other non-current payables |
1, 5 9 4
GBP
|
1, 4 4 1
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 contract liabilities [abstract] | |||
| Current contract liabilities |
3, 865
GBP
|
3, 8 82
GBP
|
— |
| Trade and other current payables |
5, 43 6
GBP
|
4 ,99 0
GBP
|
— |
| Miscellaneous non-current liabilities [abstract] | |||
| Non-current net defined benefit liability |
575,000,000
GBP
|
6 51
GBP
|
— |
| Issued capital [abstract] | |||
| Issued capital |
81,000,000
GBP
|
82,000,000
GBP
|
— |
| Retained earnings [abstract] | |||
| Retained earnings |
2,8 22
GBP
|
2,930,000,000
GBP
|
— |
| Net assets (liabilities) [abstract] | |||
| Assets |
32, 064
GBP
|
31, 4 6 2
GBP
|
— |
| Liabilities |
21, 3 41
GBP
|
20,0 62
GBP
|
— |
| Assets (liabilities) |
10,7 23
GBP
|
11, 4 0 0
GBP
|
— |
| Net current assets (liabilities) [abstract] | |||
| Current assets |
11 , 7 7 3
GBP
|
10 , 6 3 4
GBP
|
— |
| Current liabilities |
10 , 9 4 3
GBP
|
9, 8 4 6
GBP
|
— |
| Assets less current liabilities [abstract] |