Statement Of Changes In Equity [Abstract]
| Concept |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-08-12 to 2021-08-12 |
|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | |||||||||
| Statement of changes in equity [line items] | |||||||||
| Dividends recognised as distributions to non-controlling interests |
21,000,000
GBP
|
21,000,000
GBP
|
60,000,000
GBP
|
— | — | — |
60,000,000
GBP
|
— | — |
| Increase (decrease) through change in equity of subsidiaries, equity | — | — |
722,000,000
GBP
|
183,000,000
GBP
|
327,000,000
GBP
|
144,000,000
GBP
|
866,000,000
GBP
|
— | — |
| Increase (decrease) through transfer between revaluation surplus and retained earnings, equity | — | — | — |
9,000,000
GBP
|
— | — |
—
GBP
|
9,000,000
GBP
|
— |
| Purchase of treasury shares | — | — | — | — | — | — | — | — |
750,000,000
GBP
|