Statement Of Changes In Equity [Abstract]
| Concept |
As at 2024-09-30 |
2023-10-01 to 2024-09-30 |
As at 2024-09-30 |
As at 2024-09-30 |
As at 2024-09-30 |
As at 2024-09-30 |
2023-10-01 to 2024-09-30 |
2023-10-01 to 2024-09-30 |
2023-10-01 to 2024-09-30 |
2023-10-01 to 2024-09-30 |
2022-10-01 to 2023-09-30 |
2022-10-01 to 2023-09-30 |
As at 2023-09-30 |
As at 2023-09-30 |
As at 2023-09-30 |
2022-10-01 to 2023-09-30 |
2022-10-01 to 2023-09-30 |
As at 2023-09-30 |
As at 2023-09-30 |
2022-10-01 to 2023-09-30 |
As at 2022-09-30 |
As at 2022-09-30 |
As at 2022-09-30 |
As at 2022-09-30 |
As at 2022-09-30 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | |||||||||||||||||||||||||
| Statement of changes in equity [line items] | |||||||||||||||||||||||||
| Equity |
1,093,000,000
GBP
|
— |
11,000,000
GBP
|
88,000,000
GBP
|
548,000,000
GBP
|
446,000,000
GBP
|
— | — | — | — | — | — |
658,000,000
GBP
|
548,000,000
GBP
|
189,000,000
GBP
|
— | — |
12,000,000
GBP
|
1,407,000,000
GBP
|
— |
267,000,000
GBP
|
548,000,000
GBP
|
1,397,000,000
GBP
|
570,000,000
GBP
|
12,000,000
GBP
|
| Changes in equity [abstract] | |||||||||||||||||||||||||
| Comprehensive income [abstract] | |||||||||||||||||||||||||
| Profit (loss) | — |
–
GBP
|
— | — | — | — |
323,000,000
GBP
|
–
GBP
|
–
GBP
|
323,000,000
GBP
|
211,000,000
GBP
|
–
GBP
|
— | — | — |
–
GBP
|
–
GBP
|
— | — |
211,000,000
GBP
|
— | — | — | — | — |
| Other comprehensive income | — | — | — | — | — | — | — | — | — |
103,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
78,000,000
GBP
|
— | — | — | — | — |
| Comprehensive income | — |
101,000,000
GBP
|
— | — | — | — |
321,000,000
GBP
|
–
GBP
|
–
GBP
|
220,000,000
GBP
|
211,000,000
GBP
|
–
GBP
|
— | — | — |
78,000,000
GBP
|
–
GBP
|
— | — |
133,000,000
GBP
|
— | — | — | — | — |
| Dividends recognised as distributions to owners | — |
–
GBP
|
— | — | — | — |
199,000,000
GBP
|
–
GBP
|
–
GBP
|
199,000,000
GBP
|
190,000,000
GBP
|
–
GBP
|
— | — | — |
–
GBP
|
–
GBP
|
— | — |
190,000,000
GBP
|
— | — | — | — | — |
| Increase (decrease) through treasury share transactions, equity | — |
–
GBP
|
— | — | — | — |
9,000,000
GBP
|
–
GBP
|
–
GBP
|
9,000,000
GBP
|
11,000,000
GBP
|
–
GBP
|
— | — | — |
–
GBP
|
–
GBP
|
— | — |
11,000,000
GBP
|
— | — | — | — | — |
| Increase (decrease) through share-based payment transactions, equity | — |
–
GBP
|
— | — | — | — |
62,000,000
GBP
|
–
GBP
|
–
GBP
|
62,000,000
GBP
|
57,000,000
GBP
|
–
GBP
|
— | — | — |
–
GBP
|
–
GBP
|
— | — |
57,000,000
GBP
|
— | — | — | — | — |
| Increase (decrease) in equity | — |
–
GBP
|
— | — | — | — |
533,000,000
GBP
|
–
GBP
|
1,000,000
GBP
|
534,000,000
GBP
|
123,000,000
GBP
|
–
GBP
|
— | — | — |
–
GBP
|
–
GBP
|
— | — |
123,000,000
GBP
|
— | — | — | — | — |