Statement Of Changes In Equity [Abstract]
| Concept |
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 |
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 |
2023-01-01 to 2023-12-31 |
As at 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 2022-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 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 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-01-01 |
As at 2022-01-01 |
As at 2022-01-01 |
As at 2022-01-01 |
As at 2022-01-01 |
As at 2022-01-01 |
As at 2022-01-01 |
As at 2022-01-01 |
As at 2022-01-01 |
As at 2022-01-01 |
As at 2022-01-01 |
As at 2022-01-01 |
As at 2022-01-01 |
As at 2022-01-01 |
As at 2022-01-01 |
As at 2022-01-01 |
As at 2022-01-01 |
As at 2022-01-01 |
As at 2022-01-01 |
As at 2022-01-01 |
As at 2022-01-01 |
As at 2022-01-01 |
As at 2022-01-01 |
As at 2022-01-01 |
As at 2022-01-01 |
As at 2022-01-01 |
As at 2022-01-01 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Statement of changes in equity [line items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Equity | — |
1,203,000,000.000000
GBP
|
— | — |
259,000,000.000000
GBP
|
— |
943,000,000.000000
GBP
|
— | — |
2,000,000.000000
GBP
|
95,000,000.000000
GBP
|
— |
104,000,000.000000
GBP
|
883,000,000.000000
GBP
|
1,205,000,000.000000
GBP
|
322,000,000.000000
GBP
|
— | — |
1,103,000,000.000000
GBP
|
— | — | — | — | — |
938,000,000.000000
GBP
|
2,000,000.000000
GBP
|
95,000,000.000000
GBP
|
354,000,000.000000
GBP
|
104,000,000.000000
GBP
|
783,000,000.000000
GBP
|
— | — | — | — |
322,000,000.000000
GBP
|
1,105,000,000.000000
GBP
|
–
GBP
|
1,176,000,000.000000
GBP
|
33,000,000.000000
GBP
|
95,000,000.000000
GBP
|
104,000,000.000000
GBP
|
2,000,000.000000
GBP
|
977,000,000.000000
GBP
|
944,000,000.000000
GBP
|
1,496,000,000.000000
GBP
|
944,000,000.000000
GBP
|
104,000,000.000000
GBP
|
2,000,000.000000
GBP
|
2,440,000,000.000000
GBP
|
95,000,000.000000
GBP
|
2,120,000,000.000000
GBP
|
322,000,000.000000
GBP
|
944,000,000
GBP
|
944,000,000
GBP
|
–
GBP
|
–
GBP
|
944,000,000
GBP
|
–
GBP
|
–
GBP
|
944,000,000
GBP
|
2,442,000,000.000000
GBP
|
1,498,000,000.000000
GBP
|
322,000,000.000000
GBP
|
| Changes in equity [abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Profit (loss) |
129,000,000.000000
GBP
|
— |
129,000,000.000000
GBP
|
–
GBP
|
— |
–
GBP
|
— |
129,000,000.000000
GBP
|
–
GBP
|
— | — |
–
GBP
|
— | — | — | — |
–
GBP
|
129,000,000.000000
GBP
|
— |
–
GBP
|
–
GBP
|
362,000,000.000000
GBP
|
362,000,000.000000
GBP
|
–
GBP
|
— | — | — | — | — | — |
362,000,000.000000
GBP
|
–
GBP
|
–
GBP
|
362,000,000.000000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Comprehensive income |
129,000,000.000000
GBP
|
— |
129,000,000.000000
GBP
|
–
GBP
|
— |
–
GBP
|
— |
129,000,000.000000
GBP
|
–
GBP
|
— | — |
–
GBP
|
— | — | — | — |
–
GBP
|
129,000,000.000000
GBP
|
— |
–
GBP
|
–
GBP
|
362,000,000.000000
GBP
|
362,000,000.000000
GBP
|
–
GBP
|
— | — | — | — | — | — |
362,000,000.000000
GBP
|
–
GBP
|
–
GBP
|
362,000,000.000000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Dividends recognised as distributions to owners |
19,000,000.000000
GBP
|
— |
19,000,000.000000
GBP
|
–
GBP
|
— |
–
GBP
|
— |
19,000,000.000000
GBP
|
–
GBP
|
— | — |
–
GBP
|
— | — | — | — |
–
GBP
|
19,000,000.000000
GBP
|
— |
–
GBP
|
–
GBP
|
15,000,000.000000
GBP
|
15,000,000.000000
GBP
|
–
GBP
|
— | — | — | — | — | — |
15,000,000.000000
GBP
|
–
GBP
|
–
GBP
|
15,000,000.000000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Increase (decrease) through share-based payment transactions, equity |
2,000,000.000000
GBP
|
— |
2,000,000.000000
GBP
|
5,000,000.000000
GBP
|
— |
–
GBP
|
— |
3,000,000.000000
GBP
|
–
GBP
|
— | — |
–
GBP
|
— | — | — | — |
–
GBP
|
2,000,000.000000
GBP
|
— |
–
GBP
|
6,000,000.000000
GBP
|
2,000,000.000000
GBP
|
4,000,000.000000
GBP
|
–
GBP
|
— | — | — | — | — | — |
2,000,000.000000
GBP
|
–
GBP
|
–
GBP
|
2,000,000.000000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Increase (decrease) in equity |
29,000,000.000000
GBP
|
— |
29,000,000.000000
GBP
|
5,000,000.000000
GBP
|
— |
–
GBP
|
— |
34,000,000.000000
GBP
|
–
GBP
|
— | — |
–
GBP
|
— | — | — | — |
–
GBP
|
29,000,000.000000
GBP
|
— |
–
GBP
|
6,000,000.000000
GBP
|
31,000,000.000000
GBP
|
25,000,000.000000
GBP
|
–
GBP
|
— | — | — | — | — | — |
31,000,000.000000
GBP
|
–
GBP
|
–
GBP
|
31,000,000.000000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |