Subclassifications Of Assets, Liabilities And Equities [Abstract]
| Concept |
As at 2021-12-31 |
As at 2020-12-31 |
|---|---|---|
| Subclassifications of assets, liabilities and equities [abstract] | ||
| Property, plant and equipment [abstract] | ||
| Property, plant and equipment |
2, 852
GBP
|
2, 655
GBP
|
| Intangible assets and goodwill [abstract] | ||
| Intangible assets and goodwill |
1 1,716
GBP
|
11 , 7 4 5
GBP
|
| Investment property [abstract] | ||
| Investment property |
67,000,000
GBP
|
12 8
GBP
|
| Investments accounted for using equity method [abstract] | ||
| Investments accounted for using equity method |
554,000,000
GBP
|
409,000,000
GBP
|
| Trade and other non-current receivables [abstract] | ||
| Other non-current receivables |
5 51
GBP
|
50 6
GBP
|
| Miscellaneous non-current assets [abstract] | ||
| Non-current net defined benefit asset |
483,000,000
GBP
|
408,000,000
GBP
|
| Non-current investments other than investments accounted for using equity method |
76,000,000
GBP
|
–
GBP
|
| Classes of current inventories [abstract] | ||
| Current inventories |
8 11
GBP
|
858,000,000
GBP
|
| Classes of current inventories, alternative [abstract] | ||
| Cash and cash equivalents [abstract] | ||
| Cash and cash equivalents |
2 , 9 17
GBP
|
2,76 8
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 |
–
GBP
|
94,000,000
GBP
|
| Borrowings [abstract] | ||
| Non-current portion of non-current borrowings |
4, 6 0 4
GBP
|
4, 957
GBP
|
| Current borrowings and current portion of non-current borrowings [abstract] | ||
| Current borrowings |
4 57
GBP
|
4 67
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 |
519,000,000
GBP
|
524,000,000
GBP
|
| Other non-current payables |
1, 2 4 8
GBP
|
1,16 4
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 |
2 , 8 74
GBP
|
3, 23 8
GBP
|
| Trade and other current payables |
4 , 63 6
GBP
|
4, 8 9 8
GBP
|
| Miscellaneous non-current liabilities [abstract] | ||
| Non-current net defined benefit liability |
2 ,6 07
GBP
|
4 , 893
GBP
|
| Issued capital [abstract] | ||
| Issued capital |
85,000,000
GBP
|
87,000,000
GBP
|
| Retained earnings [abstract] | ||
| Retained earnings |
212,000,000
GBP
|
2 ,6 1 6
GBP
|
| Net assets (liabilities) [abstract] | ||
| Assets |
2 7,1 3 5
GBP
|
2 7, 5 3 0
GBP
|
| Liabilities |
19,4 67
GBP
|
22 ,609
GBP
|
| Assets (liabilities) |
7, 6 6 8
GBP
|
4 ,9 21
GBP
|
| Net current assets (liabilities) [abstract] | ||
| Current assets |
8 ,8 18
GBP
|
9,4 0 6
GBP
|
| Current liabilities |
8, 696
GBP
|
9, 38 3
GBP
|
| Assets less current liabilities [abstract] |