Statement Of Comprehensive Income [Abstract]
| Concept |
2021-10-01 to 2022-09-30 |
2021-10-01 to 2022-09-30 |
2021-10-01 to 2022-09-30 |
2021-10-01 to 2022-09-30 |
2021-10-01 to 2022-09-30 |
2021-10-01 to 2022-09-30 |
2021-10-01 to 2022-09-30 |
2021-10-01 to 2022-09-30 |
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 |
2020-10-01 to 2021-09-30 |
2020-10-01 to 2021-09-30 |
2020-10-01 to 2021-09-30 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of comprehensive income [abstract] | ||||||||||||||||
| Profit (loss) |
260,000,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
260,000,000
GBP
|
3,000,000
GBP
|
263,000,000
GBP
|
–
GBP
|
285,000,000
GBP
|
–
GBP
|
35,000,000
GBP
|
–
GBP
|
285,000,000
GBP
|
250,000,000
GBP
|
–
GBP
|
| Other comprehensive income [abstract] | ||||||||||||||||
| Components of other comprehensive income that will not be reclassified to profit or loss, net of tax [abstract] | ||||||||||||||||
| Other comprehensive income, net of tax, gains (losses) on remeasurements of defined benefit plans |
3,000,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
3,000,000
GBP
|
— | — |
–
GBP
|
2,000,000
GBP
|
–
GBP
|
— |
–
GBP
|
2,000,000
GBP
|
— |
–
GBP
|
| Other comprehensive income that will not be reclassified to profit or loss, net of tax |
33,000,000
GBP
|
— | — | — | — | — | — | — | — |
2,000,000
GBP
|
— | — | — | — | — | — |
| Components of other comprehensive income that will be reclassified to profit or loss, net of tax [abstract] | ||||||||||||||||
| Exchange differences on translation [abstract] | ||||||||||||||||
| Gains (losses) on exchange differences on translation of foreign operations, net of tax |
177,000,000
GBP
|
177,000,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
— | — |
–
GBP
|
6 0
GBP
|
–
GBP
|
— |
–
GBP
|
–
GBP
|
— |
60,000,000
GBP
|
| Reclassification adjustments on exchange differences on translation of foreign operations, net of tax |
13,000,000
GBP
|
13,000,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
— | — |
–
GBP
|
21,000,000
GBP
|
–
GBP
|
— |
–
GBP
|
–
GBP
|
— |
21,000,000
GBP
|
| Other comprehensive income that will be reclassified to profit or loss, net of tax |
164,000,000
GBP
|
— | — | — | — | — | — | — | — |
81,000,000
GBP
|
— | — | — | — | — | — |
| Other comprehensive income |
197,000,000
GBP
|
— | — | — | — | — | — | — | — |
79,000,000
GBP
|
— | — | — | — | — | — |
| Comprehensive income |
457,000,000
GBP
|
164,000,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
293,000,000
GBP
|
— | — |
–
GBP
|
206,000,000
GBP
|
–
GBP
|
— |
–
GBP
|
287,000,000
GBP
|
— |
81,000,000
GBP
|
| Comprehensive income attributable to [abstract] | ||||||||||||||||
| Comprehensive income, attributable to owners of parent |
457,000,000
GBP
|
— | — | — | — | — | — | — | — |
206,000,000
GBP
|
— | — | — | — | — | — |