Statement Of Financial Position [Abstract]
| Concept |
As at 2023-12-31 |
As at 2023-12-31 |
As at 2023-12-31 |
As at 2023-12-31 |
As at 2023-12-31 |
As at 2023-12-31 |
As at 2023-12-31 |
As at 2023-12-31 |
As at 2023-12-31 |
As at 2023-01-01 |
As at 2023-01-01 |
As at 2023-01-01 |
As at 2023-01-01 |
As at 2023-01-01 |
As at 2023-01-01 |
As at 2023-01-01 |
As at 2023-01-01 |
As at 2023-01-01 |
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 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 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of financial position [abstract] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Assets [abstract] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Non-current assets [abstract] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Property, plant and equipment | — | — | — |
163,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
201,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Investments accounted for using equity method | — | — | — |
229,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
232,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Deferred tax assets | — | — | — |
215,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
212,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Current assets [abstract] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Cash and cash equivalents | — | — | — |
1,196,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
1 ,133
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Assets | — | — | — |
8,031,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
9,212,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Equity and liabilities [abstract] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Equity [abstract] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Issued capital | — | — | — |
257,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
280,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Retained earnings | — | — | — |
4,449,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
4,986,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Share premium | — | — | — |
640,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
640,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Treasury shares | — | — | — |
141,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
149,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Other reserves | — | — | — |
327,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
129,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Equity attributable to owners of parent | — | — | — |
4,878,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
5,628,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Equity |
5,000,000
GBP
|
207,000,000
GBP
|
141,000,000
GBP
|
5,090,000,000
GBP
|
4 ,449
GBP
|
327,000,000
GBP
|
640,000,000
GBP
|
257,000,000
GBP
|
4,878,000,000
GBP
|
7,000,000
GBP
|
149,000,000
GBP
|
207,000,000
GBP
|
5,037,000,000
GBP
|
129,000,000
GBP
|
5,679,000,000
GBP
|
280,000,000
GBP
|
640,000,000
GBP
|
5,893,000,000
GBP
|
5,842,000,000
GBP
|
7,000,000
GBP
|
207,000,000
GBP
|
–
GBP
|
–
GBP
|
149,000,000
GBP
|
149,000,000
GBP
|
–
GBP
|
7,000,000
GBP
|
207,000,000
GBP
|
280,000,000
GBP
|
640,000,000
GBP
|
51,000,000
GBP
|
51,000,000
GBP
|
51,000,000
GBP
|
5,628,000,000
GBP
|
–
GBP
|
129,000,000
GBP
|
–
GBP
|
129,000,000
GBP
|
–
GBP
|
640,000,000
GBP
|
4,986,000,000
GBP
|
4,986,000,000
GBP
|
280,000,000
GBP
|
5,842,000,000
GBP
|
5,628,000,000
GBP
|
305,000,000
GBP
|
5,766,000,000
GBP
|
171,000,000
GBP
|
1,094,000,000
GBP
|
207,000,000
GBP
|
6,000,000
GBP
|
7,847,000,000
GBP
|
7,634,000,000
GBP
|
640,000,000
GBP
|
| Liabilities [abstract] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Non-current liabilities [abstract] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Deferred tax liabilities | — | — | — |
129,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
211,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Current liabilities [abstract] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Liabilities included in disposal groups classified as held for sale | — | — | — |
2,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
14,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Liabilities | — | — | — |
2,941,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
3,370,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Equity and liabilities | — | — | — |
8,031,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
9,212,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |