Statement Of Changes In Equity [Abstract]
| Concept |
2024-01-01 to 2024-12-31 |
2024-01-01 to 2024-12-31 |
2024-01-01 to 2024-12-31 |
As at 2024-12-31 |
As at 2024-12-31 |
2024-01-01 to 2024-12-31 |
As at 2024-12-31 |
As at 2024-12-31 |
2024-01-01 to 2024-12-31 |
2024-01-01 to 2024-12-31 |
2024-01-01 to 2024-12-31 |
As at 2024-12-31 |
As at 2024-12-31 |
As at 2024-12-31 |
2023-01-01 to 2023-12-31 |
As at 2023-12-31 |
2023-01-01 to 2023-12-31 |
2023-01-01 to 2023-12-31 |
As at 2023-12-31 |
As at 2023-12-31 |
As at 2023-12-31 |
2023-01-01 to 2023-12-31 |
2023-01-01 to 2023-12-31 |
As at 2023-12-31 |
2023-01-01 to 2023-12-31 |
As at 2023-12-31 |
2023-01-01 to 2023-12-31 |
As at 2023-12-31 |
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | |||||||||||||||||||||||||||||||||||
| Statement of changes in equity [line items] | |||||||||||||||||||||||||||||||||||
| Equity | — | — | — |
346,000,000
GBP
|
863,000,000
GBP
|
— |
58,000,000
GBP
|
115,000,000
GBP
|
— | — | — |
1,000,000
GBP
|
42,000,000
GBP
|
1,423,000,000
GBP
|
— |
1,519,000,000
GBP
|
— | — |
958,000,000
GBP
|
346,000,000
GBP
|
–
GBP
|
— | — |
58,000,000
GBP
|
— |
115,000,000
GBP
|
— |
42,000,000
GBP
|
1,548,000,000
GBP
|
1,000,000
GBP
|
41,000,000
GBP
|
989,000,000
GBP
|
346,000,000
GBP
|
115,000,000
GBP
|
58,000,000
GBP
|
| Changes in equity [abstract] | |||||||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | |||||||||||||||||||||||||||||||||||
| Profit (loss) |
–
GBP
|
–
GBP
|
–
GBP
|
— | — |
–
GBP
|
— | — |
34,000,000
GBP
|
34,000,000
GBP
|
–
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Other comprehensive income |
1,000,000
GBP
|
–
GBP
|
–
GBP
|
— | — |
–
GBP
|
— | — |
–
GBP
|
1,000,000
GBP
|
–
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Comprehensive income |
1,000,000
GBP
|
–
GBP
|
–
GBP
|
— | — |
–
GBP
|
— | — |
34,000,000
GBP
|
35,000,000
GBP
|
–
GBP
|
— | — | — |
42,000,000
GBP
|
— |
–
GBP
|
–
GBP
|
— | — | — |
42,000,000
GBP
|
–
GBP
|
— |
–
GBP
|
— |
–
GBP
|
— | — | — | — | — | — | — | — |
| Dividends recognised as distributions to owners |
–
GBP
|
–
GBP
|
–
GBP
|
— | — |
–
GBP
|
— | — |
73,000,000
GBP
|
73,000,000
GBP
|
–
GBP
|
— | — | — |
65,000,000
GBP
|
— |
–
GBP
|
–
GBP
|
— | — | — |
65,000,000
GBP
|
–
GBP
|
— |
–
GBP
|
— |
–
GBP
|
— | — | — | — | — | — | — | — |
| Increase (decrease) through treasury share transactions, equity |
–
GBP
|
–
GBP
|
–
GBP
|
— | — |
–
GBP
|
— | — |
6,000,000
GBP
|
6,000,000
GBP
|
–
GBP
|
— | — | — |
13,000,000
GBP
|
— |
–
GBP
|
–
GBP
|
— | — | — |
13,000,000
GBP
|
–
GBP
|
— |
–
GBP
|
— |
–
GBP
|
— | — | — | — | — | — | — | — |
| Increase (decrease) through share-based payment transactions, equity |
–
GBP
|
–
GBP
|
–
GBP
|
— | — |
–
GBP
|
— | — |
18,000,000
GBP
|
14,000,000
GBP
|
4,000,000
GBP
|
— | — | — |
18,000,000
GBP
|
— |
–
GBP
|
–
GBP
|
— | — | — |
18,000,000
GBP
|
–
GBP
|
— |
–
GBP
|
— |
–
GBP
|
— | — | — | — | — | — | — | — |