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 |
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 |
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 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 |
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 |
As at 2022-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 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 changes in equity [abstract] | |||||||||||||||||||||||||||||||||||||||||||||
| Statement of changes in equity [line items] | |||||||||||||||||||||||||||||||||||||||||||||
| Equity | — |
1,519,000,000
GBP
|
— | — |
958,000,000
GBP
|
346,000,000
GBP
|
–
GBP
|
— | — |
58,000,000
GBP
|
— |
115,000,000
GBP
|
— |
–
GBP
|
— |
–
GBP
|
42,000,000
GBP
|
— |
1,548,000,000
GBP
|
— | — | — | — | — |
1,000,000
GBP
|
— |
58,000,000
GBP
|
346,000,000
GBP
|
41,000,000
GBP
|
115,000,000
GBP
|
989,000,000
GBP
|
–
GBP
|
— |
–
GBP
|
— | — |
1,482,000,000
GBP
|
17,000,000
GBP
|
1,000,000
GBP
|
1,739,000,000
GBP
|
–
GBP
|
25,000,000
GBP
|
58,000,000
GBP
|
42,000,000
GBP
|
116,000,000
GBP
|
| Changes in equity [abstract] | |||||||||||||||||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | |||||||||||||||||||||||||||||||||||||||||||||
| Profit (loss) |
42,000,000
GBP
|
— |
–
GBP
|
–
GBP
|
— | — | — |
42,000,000
GBP
|
–
GBP
|
— |
–
GBP
|
— |
–
GBP
|
— |
–
GBP
|
— | — |
–
GBP
|
— |
–
GBP
|
–
GBP
|
175,000,000
GBP
|
175,000,000
GBP
|
–
GBP
|
— |
–
GBP
|
— | — | — | — | — | — |
–
GBP
|
— |
–
GBP
|
–
GBP
|
— | — | — | — | — | — | — | — | — |
| Comprehensive income |
42,000,000
GBP
|
— |
–
GBP
|
–
GBP
|
— | — | — |
42,000,000
GBP
|
–
GBP
|
— |
–
GBP
|
— |
–
GBP
|
— |
–
GBP
|
— | — |
–
GBP
|
— |
–
GBP
|
–
GBP
|
175,000,000
GBP
|
175,000,000
GBP
|
–
GBP
|
— |
–
GBP
|
— | — | — | — | — | — |
–
GBP
|
— |
–
GBP
|
–
GBP
|
— | — | — | — | — | — | — | — | — |
| Issue of equity | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
–
GBP
|
–
GBP
|
–
GBP
|
303,000,000
GBP
|
–
GBP
|
— |
25,000,000
GBP
|
— | — | — | — | — | — |
328,000,000
GBP
|
— |
–
GBP
|
–
GBP
|
— | — | — | — | — | — | — | — | — |
| Dividends recognised as distributions to owners |
65,000,000
GBP
|
— |
–
GBP
|
–
GBP
|
— | — | — |
65,000,000
GBP
|
–
GBP
|
— |
–
GBP
|
— |
–
GBP
|
— |
–
GBP
|
— | — |
–
GBP
|
— |
–
GBP
|
–
GBP
|
78,000,000
GBP
|
78,000,000
GBP
|
–
GBP
|
— |
–
GBP
|
— | — | — | — | — | — |
–
GBP
|
— |
–
GBP
|
–
GBP
|
— | — | — | — | — | — | — | — | — |
| Increase (decrease) through treasury share transactions, equity |
13,000,000
GBP
|
— |
–
GBP
|
–
GBP
|
— | — | — |
13,000,000
GBP
|
–
GBP
|
— |
–
GBP
|
— |
–
GBP
|
— |
–
GBP
|
— | — |
–
GBP
|
— |
–
GBP
|
–
GBP
|
22,000,000
GBP
|
22,000,000
GBP
|
–
GBP
|
— |
–
GBP
|
— | — | — | — | — | — |
–
GBP
|
— |
–
GBP
|
–
GBP
|
— | — | — | — | — | — | — | — | — |
| Increase (decrease) through share-based payment transactions, equity |
18,000,000
GBP
|
— |
–
GBP
|
–
GBP
|
— | — | — |
18,000,000
GBP
|
–
GBP
|
— |
–
GBP
|
— |
–
GBP
|
— |
–
GBP
|
— | — |
–
GBP
|
— |
–
GBP
|
–
GBP
|
24,000,000
GBP
|
23,000,000
GBP
|
–
GBP
|
— |
–
GBP
|
— | — | — | — | — | — |
–
GBP
|
— |
1,000,000
GBP
|
–
GBP
|
— | — | — | — | — | — | — | — | — |