Statement Of Changes In Equity [Abstract]
| Concept |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
|---|---|---|
| Statement of changes in equity [abstract] | ||
| Statement of changes in equity [line items] | ||
| Increase (decrease) through disposal of subsidiary, equity |
181,000,000
GBP
|
181,000,000
GBP
|