Statement Of Comprehensive Income [Abstract]
| Concept |
2022-10-01 to 2023-09-30 |
2022-10-01 to 2023-09-30 |
2022-10-01 to 2023-09-30 |
2022-10-01 to 2023-09-30 |
2022-10-01 to 2023-09-30 |
2022-10-01 to 2023-09-30 |
2022-10-01 to 2023-09-30 |
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of comprehensive income [abstract] | ||||||||||||||
| Profit (loss) |
–
GBP
|
–
GBP
|
211,000,000
GBP
|
211,000,000
GBP
|
–
GBP
|
329,000,000
GBP
|
118,000,000
GBP
|
260,000,000
GBP
|
260,000,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
3,000,000
GBP
|
263,000,000
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 | — | — |
–
GBP
|
— | — | — | — |
3,000,000
GBP
|
3,000,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
— | — |
| Other comprehensive income that will not be reclassified to profit or loss, net of tax | — | — |
–
GBP
|
— | — | — | — | — |
33,000,000
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 |
–
GBP
|
–
GBP
|
82,000,000
GBP
|
–
GBP
|
82,000,000
GBP
|
— | — |
–
GBP
|
177,000,000
GBP
|
–
GBP
|
177,000,000
GBP
|
–
GBP
|
— | — |
| Reclassification adjustments on exchange differences on translation of foreign operations, net of tax | — | — |
–
GBP
|
— | — | — | — |
–
GBP
|
13,000,000
GBP
|
–
GBP
|
13,000,000
GBP
|
–
GBP
|
— | — |
| Cash flow hedges [abstract] | ||||||||||||||
| Other comprehensive income, net of tax, cash flow hedges |
–
GBP
|
–
GBP
|
4,000,000
GBP
|
–
GBP
|
4,000,000
GBP
|
— | — | — |
–
GBP
|
— | — | — | — | — |
| Other comprehensive income that will be reclassified to profit or loss, net of tax | — | — |
78,000,000
GBP
|
— | — | — | — | — |
164,000,000
GBP
|
— | — | — | — | — |
| Other comprehensive income | — | — |
78,000,000
GBP
|
— | — | — | — | — |
197,000,000
GBP
|
— | — | — | — | — |
| Comprehensive income |
–
GBP
|
–
GBP
|
133,000,000
GBP
|
211,000,000
GBP
|
78,000,000
GBP
|
— | — |
293,000,000
GBP
|
457,000,000
GBP
|
–
GBP
|
164,000,000
GBP
|
–
GBP
|
— | — |
| Comprehensive income attributable to [abstract] | ||||||||||||||
| Comprehensive income, attributable to owners of parent | — | — |
133,000,000
GBP
|
— | — | — | — | — |
457,000,000
GBP
|
— | — | — | — | — |