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 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of financial position [abstract] | |||||||||||||||||||||||||||
| Assets [abstract] | |||||||||||||||||||||||||||
| Non-current assets [abstract] | |||||||||||||||||||||||||||
| Property, plant and equipment |
201,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
187,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Investments accounted for using equity method |
267,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
274,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Deferred tax assets |
212,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
168,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Current assets [abstract] | |||||||||||||||||||||||||||
| Cash and cash equivalents |
1,13 3
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
1,904,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Assets |
9,24 7
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
11, 41 8
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Equity and liabilities [abstract] | |||||||||||||||||||||||||||
| Equity [abstract] | |||||||||||||||||||||||||||
| Issued capital |
280,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
305,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Retained earnings |
5 ,0 21
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
5, 775
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Share premium |
640,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
640,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Treasury shares |
14 9
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
171,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Other reserves |
12 9
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
1,094,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Equity attributable to owners of parent |
5,663,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
7, 643
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Equity |
5,87 7
GBP
|
7,000,000
GBP
|
207,000,000
GBP
|
14 9
GBP
|
12 9
GBP
|
640,000,000
GBP
|
5,02 1
GBP
|
280,000,000
GBP
|
5,66 3
GBP
|
5,77 5
GBP
|
17 1
GBP
|
1,09 4
GBP
|
207,000,000
GBP
|
6,000,000
GBP
|
7,856,000,000
GBP
|
7,64 3
GBP
|
640,000,000
GBP
|
305,000,000
GBP
|
4, 970
GBP
|
306,000,000
GBP
|
6, 810
GBP
|
3,000,000
GBP
|
–
GBP
|
170,000,000
GBP
|
1,064,000,000
GBP
|
640,000,000
GBP
|
6, 813
GBP
|
| Liabilities [abstract] | |||||||||||||||||||||||||||
| Non-current liabilities [abstract] | |||||||||||||||||||||||||||
| Deferred tax liabilities |
211,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
165,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Current liabilities [abstract] | |||||||||||||||||||||||||||
| Liabilities included in disposal groups classified as held for sale |
14,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
–
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Liabilities |
3,37 0
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
3,562,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Equity and liabilities |
9,247,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
11,418,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |