Statement Of Comprehensive Income [Abstract]
| Concept |
2021-09-19 to 2022-09-30 |
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 |
2020-09-19 to 2021-09-30 |
2020-09-13 to 2021-09-18 |
2020-09-13 to 2021-09-18 |
2020-09-13 to 2021-09-18 |
2020-09-13 to 2021-09-18 |
2020-09-13 to 2021-09-18 |
2020-09-13 to 2021-09-18 |
2020-09-13 to 2021-09-18 |
2020-09-13 to 2021-09-18 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of comprehensive income [abstract] | ||||||||||||||||||
| Profit (loss) | — |
–
GBP
|
–
GBP
|
700,000,000
GBP
|
700,000,000
GBP
|
20,000,000
GBP
|
720,000,000
GBP
|
–
GBP
|
–
GBP
|
— |
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
498,000,000
GBP
|
478,000,000
GBP
|
478,000,000
GBP
|
20,000,000
GBP
|
| Other comprehensive income [abstract] | ||||||||||||||||||
| Other comprehensive income that will not be reclassified to profit or loss, net of tax | — |
–
GBP
|
–
GBP
|
623,000,000
GBP
|
623,000,000
GBP
|
–
GBP
|
623,000,000
GBP
|
–
GBP
|
–
GBP
|
— |
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
415,000,000
GBP
|
415,000,000
GBP
|
415,000,000
GBP
|
–
GBP
|
| Components of other comprehensive income that will be reclassified to profit or loss, net of tax [abstract] | ||||||||||||||||||
| Hedges of net investment in foreign operations [abstract] | ||||||||||||||||||
| Other comprehensive income, net of tax, hedges of net investments in foreign operations | — |
–
GBP
|
1,000,000
GBP
|
1,000,000
GBP
|
–
GBP
|
–
GBP
|
1,000,000
GBP
|
–
GBP
|
–
GBP
|
— |
–
GBP
|
14,000,000
GBP
|
–
GBP
|
–
GBP
|
14,000,000
GBP
|
14,000,000
GBP
|
–
GBP
|
–
GBP
|
| Financial assets measured at fair value through other comprehensive income [abstract] | ||||||||||||||||||
| Other comprehensive income, net of tax, financial assets measured at fair value through other comprehensive income | — |
–
GBP
|
–
GBP
|
4,000,000
GBP
|
–
GBP
|
–
GBP
|
4,000,000
GBP
|
4,000,000
GBP
|
–
GBP
|
— | — | — | — | — | — | — | — | — |
| Share of other comprehensive income of associates and joint ventures accounted for using equity method that will be reclassified to profit or loss, net of tax |
28,000,000
GBP
|
–
GBP
|
28,000,000
GBP
|
28,000,000
GBP
|
–
GBP
|
–
GBP
|
28,000,000
GBP
|
–
GBP
|
–
GBP
|
10,000,000
GBP
|
–
GBP
|
10,000,000
GBP
|
–
GBP
|
–
GBP
|
10,000,000
GBP
|
10,000,000
GBP
|
–
GBP
|
–
GBP
|
| Other comprehensive income that will be reclassified to profit or loss, net of tax | — |
391,000,000
GBP
|
456,000,000
GBP
|
896,000,000
GBP
|
46,000,000
GBP
|
11,000,000
GBP
|
907,000,000
GBP
|
3,000,000
GBP
|
–
GBP
|
— |
–
GBP
|
357,000,000
GBP
|
–
GBP
|
25,000,000
GBP
|
314,000,000
GBP
|
314,000,000
GBP
|
18,000,000
GBP
|
–
GBP
|
| Other comprehensive income | — |
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
|
— |
–
GBP
|
357,000,000
GBP
|
–
GBP
|
25,000,000
GBP
|
101,000,000
GBP
|
101,000,000
GBP
|
433,000,000
GBP
|
–
GBP
|
| Comprehensive income | — |
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
|
— |
–
GBP
|
357,000,000
GBP
|
–
GBP
|
25,000,000
GBP
|
599,000,000
GBP
|
579,000,000
GBP
|
911,000,000
GBP
|
20,000,000
GBP
|
| Comprehensive income attributable to [abstract] | ||||||||||||||||||
| Comprehensive income, attributable to owners of parent | — | — | — | — | — | — |
2,219,000,000
GBP
|
— | — | — | — | — | — | — |
579,000,000
GBP
|
— | — | — |
| Comprehensive income, attributable to non-controlling interests | — | — | — | — | — | — |
31,000,000
GBP
|
— | — | — | — | — | — | — |
20,000,000
GBP
|
— | — | — |