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 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 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of financial position [abstract] | ||||||||||||||||||||||||||||||||||||||||||
| Assets [abstract] | ||||||||||||||||||||||||||||||||||||||||||
| Non-current assets [abstract] | ||||||||||||||||||||||||||||||||||||||||||
| Property, plant and equipment |
495,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
398,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Right-of-use assets |
454,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
228,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Trade and other non-current receivables |
90,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
14,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Deferred tax assets |
43,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
42,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Non-current assets |
8,683,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
2,980,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Current assets [abstract] | ||||||||||||||||||||||||||||||||||||||||||
| Current inventories |
200,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
136,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Trade and other current receivables |
832,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
527,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Current tax assets, current |
36,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
9,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Cash and cash equivalents |
2,170,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
668,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Current assets |
3,239,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
1,344,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Equity and liabilities [abstract] | ||||||||||||||||||||||||||||||||||||||||||
| Equity [abstract] | ||||||||||||||||||||||||||||||||||||||||||
| Issued capital |
25,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
19,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Retained earnings |
3,302,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
3,166,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Share premium |
9,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
7,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Other reserves |
763,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
1,927,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Equity attributable to owners of parent |
4,099,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
1,265,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Non-controlling interests |
1,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
1,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Equity |
4,098,000,000
GBP
|
4,000,000
GBP
|
763,000,000
GBP
|
1,000,000
GBP
|
9,000,000
GBP
|
1,723,000,000
GBP
|
3,302,000,000
GBP
|
25,000,000
GBP
|
511,000,000
GBP
|
2,998,000,000
GBP
|
3,000,000
GBP
|
3,166,000,000
GBP
|
1,723,000,000
GBP
|
1,927,000,000
GBP
|
1,264,000,000
GBP
|
9,000,000
GBP
|
2,000,000
GBP
|
7,000,000
GBP
|
1,000,000
GBP
|
211,000,000
GBP
|
19,000,000
GBP
|
3,031,000,000
GBP
|
1,000,000
GBP
|
4,000,000
GBP
|
10,000,000
GBP
|
1,000,000
GBP
|
18,000,000
GBP
|
208,000,000
GBP
|
1,926,000,000
GBP
|
7,000,000
GBP
|
1,131,000,000
GBP
|
1,723,000,000
GBP
|
10,000,000
GBP
|
1,868,000,000
GBP
|
1,000,000
GBP
|
156,000,000
GBP
|
7,000,000
GBP
|
1,002,000,000
GBP
|
2,844,000,000
GBP
|
1,723,000,000
GBP
|
1,000,000
GBP
|
18,000,000
GBP
|
| Liabilities [abstract] | ||||||||||||||||||||||||||||||||||||||||||
| Non-current liabilities [abstract] | ||||||||||||||||||||||||||||||||||||||||||
| Non-current provisions [abstract] | ||||||||||||||||||||||||||||||||||||||||||
| Other non-current provisions |
359,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
34,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Trade and other non-current payables |
81,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
72,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Deferred tax liabilities |
511,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
108,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Non-current liabilities |
4,979,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
1,670,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Current liabilities [abstract] | ||||||||||||||||||||||||||||||||||||||||||
| Current provisions [abstract] | ||||||||||||||||||||||||||||||||||||||||||
| Current provisions |
133,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
27,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Trade and other current payables |
1,162,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
764,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Current tax liabilities, current |
60,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
61,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Current liabilities |
2,845,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
1,390,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |