Statement Of Cash Flows [Abstract]
| Concept |
2023-10-01 to 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 |
2023-10-01 to 2024-09-30 |
2023-10-01 to 2024-09-30 |
2022-10-01 to 2023-09-30 |
As at 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 |
As at 2022-09-30 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of cash flows [abstract] | |||||||||||||||||
| Cash flows from (used in) operating activities [abstract] | |||||||||||||||||
| Profit (loss) |
2,613,000,000
GBP
|
— |
2,747,000,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
134,000,000
GBP
|
2,613,000,000
GBP
|
–
GBP
|
— |
–
GBP
|
–
GBP
|
2,456,000,000
GBP
|
2,328,000,000
GBP
|
128,000,000
GBP
|
2,328,000,000
GBP
|
— |
| Adjustments to reconcile profit (loss) [abstract] | |||||||||||||||||
| Adjustments for income tax expense | — | — |
888,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
590,000,000
GBP
|
— | — | — | — |
| Adjustments for decrease (increase) in inventories | — | — |
205,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
551,000,000
GBP
|
— | — | — | — |
| Adjustments for provisions | — | — |
102,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
21,000,000
GBP
|
— | — | — | — |
| Adjustments for share-based payments | — | — |
46,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
31,000,000
GBP
|
— | — | — | — |
| Other adjustments for non-cash items | — | — |
1,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
40,000,000
GBP
|
— | — | — | — |
| Adjustments for losses (gains) on disposal of non-current assets | — | — |
13,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
39,000,000
GBP
|
— | — | — | — |
| Cash flows from (used in) operating activities | — | — |
3,307,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
3,129,000,000
GBP
|
— | — | — | — |
| Cash flows from (used in) investing activities [abstract] | |||||||||||||||||
| Purchase of intangible assets, classified as investing activities | — | — |
42,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
183,000,000
GBP
|
— | — | — | — |
| Purchase of other long-term assets, classified as investing activities | — | — |
371,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
325,000,000
GBP
|
— | — | — | — |
| Interest received, classified as investing activities | — | — |
15,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
10,000,000
GBP
|
— | — | — | — |
| Cash flows from (used in) investing activities | — | — |
348,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
427,000,000
GBP
|
— | — | — | — |
| Cash flows from (used in) financing activities [abstract] | |||||||||||||||||
| Proceeds from borrowings, classified as financing activities | — | — |
3,848,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
1,462,000,000
GBP
|
— | — | — | — |
| Repayments of borrowings, classified as financing activities | — | — |
3,948,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
1,518,000,000
GBP
|
— | — | — | — |
| Payments of lease liabilities, classified as financing activities | — | — |
93,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
92,000,000
GBP
|
— | — | — | — |
| Interest paid, classified as financing activities | — | — |
431,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
417,000,000
GBP
|
— | — | — | — |
| Cash flows from (used in) financing activities | — | — |
3,162,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
3,051,000,000
GBP
|
— | — | — | — |
| Increase (decrease) in cash and cash equivalents before effect of exchange rate changes | — | — |
203,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
349,000,000
GBP
|
— | — | — | — |
| Effect of exchange rate changes on cash and cash equivalents [abstract] | |||||||||||||||||
| Effect of exchange rate changes on cash and cash equivalents | — | — |
64,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
156,000,000
GBP
|
— | — | — | — |
| Cash and cash equivalents | — |
1,078,000,000
GBP
|
— | — | — | — | — | — | — |
1,345,000,000
GBP
|
— | — | — | — | — | — |
1,850,000,000
GBP
|