Statement Of Comprehensive Income [Abstract]
| Concept |
2022-09-18 to 2023-09-16 |
2022-09-18 to 2023-09-16 |
2022-09-18 to 2023-09-16 |
2022-09-18 to 2023-09-16 |
2022-09-18 to 2023-09-16 |
2022-09-18 to 2023-09-16 |
2022-09-18 to 2023-09-16 |
2022-09-18 to 2023-09-16 |
2021-09-19 to 2022-09-17 |
2021-09-19 to 2022-09-17 |
2021-09-19 to 2022-09-17 |
2021-09-19 to 2022-09-17 |
2021-09-19 to 2022-09-17 |
2021-09-19 to 2022-09-17 |
2021-09-19 to 2022-09-17 |
2021-09-19 to 2022-09-17 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of comprehensive income [abstract] | ||||||||||||||||
| Profit (loss) |
1,044,000,000
GBP
|
1,044,000,000
GBP
|
24,000,000
GBP
|
1,068,000,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
700,000,000
GBP
|
700,000,000
GBP
|
20,000,000
GBP
|
720,000,000
GBP
|
–
GBP
|
–
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 |
7,000,000
GBP
|
7,000,000
GBP
|
–
GBP
|
7,000,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
821,000,000
GBP
|
821,000,000
GBP
|
–
GBP
|
821,000,000
GBP
|
–
GBP
|
–
GBP
|
| Components of other comprehensive income that will be reclassified to profit or loss, before tax [abstract] | ||||||||||||||||
| Exchange differences on translation [abstract] | ||||||||||||||||
| Other comprehensive income, before tax, exchange differences on translation of foreign operations |
448,000,000
GBP
|
–
GBP
|
22,000,000
GBP
|
470,000,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
448,000,000
GBP
|
–
GBP
|
429,000,000
GBP
|
429,000,000
GBP
|
–
GBP
|
11,000,000
GBP
|
440,000,000
GBP
|
–
GBP
|
–
GBP
|
| Cash flow hedges [abstract] | ||||||||||||||||
| Gains (losses) on cash flow hedges, before tax | — | — | — |
260,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
419,000,000
GBP
|
— | — |
| Other comprehensive income, before tax, cash flow hedges |
260,000,000
GBP
|
–
GBP
|
–
GBP
|
260,000,000
GBP
|
–
GBP
|
–
GBP
|
260,000,000
GBP
|
–
GBP
|
419,000,000
GBP
|
–
GBP
|
419,000,000
GBP
|
–
GBP
|
–
GBP
|
419,000,000
GBP
|
–
GBP
|
–
GBP
|
| Hedges of net investment in foreign operations [abstract] | ||||||||||||||||
| Gains (losses) on hedges of net investments in foreign operations, before tax | — | — | — |
1,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
1,000,000
GBP
|
— | — |
| Financial assets measured at fair value through other comprehensive income [abstract] | ||||||||||||||||
| Other comprehensive income, before tax, financial assets measured at fair value through other comprehensive income | — | — | — |
–
GBP
|
— | — | — | — | — | — | — | — | — |
4,000,000
GBP
|
— | — |
| Income tax relating to components of other comprehensive income that will not be reclassified to profit or loss [abstract] | ||||||||||||||||
| Income tax relating to remeasurements of defined benefit plans included in other comprehensive income |
4,000,000
GBP
|
4,000,000
GBP
|
–
GBP
|
4,000,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
198,000,000
GBP
|
198,000,000
GBP
|
–
GBP
|
198,000,000
GBP
|
–
GBP
|
–
GBP
|
| Income tax relating to components of other comprehensive income that will be reclassified to profit or loss [abstract] | ||||||||||||||||
| Income tax relating to cash flow hedges included in other comprehensive income |
40,000,000
GBP
|
–
GBP
|
–
GBP
|
40,000,000
GBP
|
–
GBP
|
–
GBP
|
40,000,000
GBP
|
–
GBP
|
28,000,000
GBP
|
–
GBP
|
28,000,000
GBP
|
–
GBP
|
–
GBP
|
28,000,000
GBP
|
–
GBP
|
–
GBP
|
| Income tax relating to components of other comprehensive income that will be reclassified to profit or loss | — | — | — |
–
GBP
|
— | — | — | — | — | — | — | — | — |
1,000,000
GBP
|
— | — |
| Other comprehensive income |
647,000,000
GBP
|
37,000,000
GBP
|
22,000,000
GBP
|
669,000,000
GBP
|
–
GBP
|
–
GBP
|
220,000,000
GBP
|
464,000,000
GBP
|
391,000,000
GBP
|
456,000,000
GBP
|
1,519,000,000
GBP
|
669,000,000
GBP
|
11,000,000
GBP
|
1,530,000,000
GBP
|
3,000,000
GBP
|
–
GBP
|
| Comprehensive income |
397,000,000
GBP
|
1,081,000,000
GBP
|
2,000,000
GBP
|
399,000,000
GBP
|
–
GBP
|
–
GBP
|
220,000,000
GBP
|
464,000,000
GBP
|
391,000,000
GBP
|
456,000,000
GBP
|
2,219,000,000
GBP
|
1,369,000,000
GBP
|
31,000,000
GBP
|
2,250,000,000
GBP
|
3,000,000
GBP
|
–
GBP
|
| Comprehensive income attributable to [abstract] | ||||||||||||||||
| Comprehensive income, attributable to owners of parent | — | — | — |
397,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
2,219,000,000
GBP
|
— | — |
| Comprehensive income, attributable to non-controlling interests | — | — | — |
2,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
31,000,000
GBP
|
— | — |