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 |
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) |
–
GBP
|
2,328,000,000
GBP
|
2,328,000,000
GBP
|
–
GBP
|
–
GBP
|
128,000,000
GBP
|
2,456,000,000
GBP
|
95,000,000
GBP
|
1,570,000,000
GBP
|
–
GBP
|
1,570,000,000
GBP
|
–
GBP
|
–
GBP
|
1,665,000,000
GBP
|
— | — | — | — | — | — | — |
| Other comprehensive income [abstract] | |||||||||||||||||||||
| Components of other comprehensive income that will not be reclassified to profit or loss, before tax [abstract] | |||||||||||||||||||||
| Other comprehensive income, before tax, gains (losses) on remeasurements of defined benefit plans | — | — | — | — | — | — |
376,000,000
GBP
|
–
GBP
|
76,000,000
GBP
|
–
GBP
|
76,000,000
GBP
|
–
GBP
|
–
GBP
|
76,000,000
GBP
|
–
GBP
|
–
GBP
|
376,000,000
GBP
|
–
GBP
|
376,000,000
GBP
|
–
GBP
|
376,000,000
GBP
|
| Components of other comprehensive income that will be reclassified to profit or loss, before tax [abstract] | |||||||||||||||||||||
| Exchange differences on translation [abstract] | |||||||||||||||||||||
| Gains (losses) on exchange differences on translation of foreign operations, before tax | — | — | — | — | — | — |
508,000,000
GBP
|
— | — | — | — | — | — |
841,000,000
GBP
|
— | — | — | — | — | — | — |
| Other comprehensive income |
–
GBP
|
844,000,000
GBP
|
236,000,000
GBP
|
–
GBP
|
608,000,000
GBP
|
15,000,000
GBP
|
859,000,000
GBP
|
16,000,000
GBP
|
1,208,000,000
GBP
|
–
GBP
|
45,000,000
GBP
|
1,163,000,000
GBP
|
–
GBP
|
1,224,000,000
GBP
|
— | — | — | — | — | — | — |
| Comprehensive income |
–
GBP
|
1,484,000,000
GBP
|
2,092,000,000
GBP
|
–
GBP
|
608,000,000
GBP
|
113,000,000
GBP
|
1,597,000,000
GBP
|
111,000,000
GBP
|
2,778,000,000
GBP
|
–
GBP
|
1,615,000,000
GBP
|
1,163,000,000
GBP
|
–
GBP
|
2,889,000,000
GBP
|
— | — | — | — | — | — | — |
| Comprehensive income attributable to [abstract] | |||||||||||||||||||||
| Comprehensive income, attributable to owners of parent | — | — | — | — | — | — |
1,484,000,000
GBP
|
— | — | — | — | — | — |
2,778,000,000
GBP
|
— | — | — | — | — | — | — |
| Comprehensive income, attributable to non-controlling interests | — | — | — | — | — | — |
113,000,000
GBP
|
— | — | — | — | — | — |
111,000,000
GBP
|
— | — | — | — | — | — | — |