Statement Of Financial Position [Abstract]
| Concept |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of financial position [abstract] | ||||||||||||||||||||||||||||||||||||
| Assets [abstract] | ||||||||||||||||||||||||||||||||||||
| Non-current assets [abstract] | ||||||||||||||||||||||||||||||||||||
| Property, plant and equipment |
110,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
123,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Right-of-use assets |
165,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
187,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Trade and other non-current receivables |
51,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
44,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Deferred tax assets |
15,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
17,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Non-current assets |
2,3 39
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
2,325,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Current assets [abstract] | ||||||||||||||||||||||||||||||||||||
| Trade and other current receivables |
2, 198
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
2,068,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Cash and cash equivalents |
888,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
784,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Current assets |
3,5 24
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
3 , 125
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Assets |
5, 863
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
5 ,450
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Equity and liabilities [abstract] | ||||||||||||||||||||||||||||||||||||
| Equity [abstract] | ||||||||||||||||||||||||||||||||||||
| Issued capital |
197,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
197,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Retained earnings |
2,800,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
2 ,7 6 9
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Other reserves |
854,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
1 , 005
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Equity attributable to owners of parent |
2, 143
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
1,9 6 1
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Non-controlling interests |
18,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
17,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Equity |
2, 161
GBP
|
–
GBP
|
5,000,000
GBP
|
18,000,000
GBP
|
–
GBP
|
2, 800
GBP
|
22,000,000
GBP
|
197,000,000
GBP
|
–
GBP
|
2, 143
GBP
|
94 6
GBP
|
109,000,000
GBP
|
2 6
GBP
|
2 ,7 6 9
GBP
|
5,000,000
GBP
|
946,000,000
GBP
|
–
GBP
|
38,000,000
GBP
|
1,9 7 8
GBP
|
–
GBP
|
1 ,9 6 1
GBP
|
–
GBP
|
197,000,000
GBP
|
17,000,000
GBP
|
–
GBP
|
41,000,000
GBP
|
1, 38 3
GBP
|
4,000,000
GBP
|
19,000,000
GBP
|
1, 182
GBP
|
1,67 9
GBP
|
141,000,000
GBP
|
1, 3 8 4
GBP
|
27,000,000
GBP
|
17,000,000
GBP
|
1,6 9 8
GBP
|
| Liabilities [abstract] | ||||||||||||||||||||||||||||||||||||
| Non-current liabilities [abstract] | ||||||||||||||||||||||||||||||||||||
| Non-current provisions [abstract] | ||||||||||||||||||||||||||||||||||||
| Non-current provisions |
31,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
38,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Trade and other non-current payables |
60,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
53,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Deferred tax liabilities |
85,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
1 07
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Non-current liabilities |
1 ,214
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
1 ,230
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Current liabilities [abstract] | ||||||||||||||||||||||||||||||||||||
| Current provisions [abstract] | ||||||||||||||||||||||||||||||||||||
| Current provisions |
9,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
5,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Trade and other current payables |
2, 149
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
1,9 7 7
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Current liabilities |
2, 488
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
2,242,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Liabilities |
3,70 2
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
3 ,472
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |