Statement Of Changes In Equity [Abstract]
| Concept |
2020-10-01 to 2021-09-30 |
2020-10-01 to 2021-09-30 |
2020-10-01 to 2021-09-30 |
2020-10-01 to 2021-09-30 |
2020-10-01 to 2021-09-30 |
2020-10-01 to 2021-09-30 |
|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | ||||||
| Statement of changes in equity [line items] | ||||||
| Purchase of treasury shares |
–
GBP
|
602,000,000
GBP
|
–
GBP
|
–
GBP
|
602,000,000
GBP
|
–
GBP
|