Statement Of Comprehensive Income [Abstract]
| Concept |
2021-04-01 to 2022-03-31 |
2021-04-01 to 2022-03-31 |
2021-04-01 to 2022-03-31 |
2021-04-01 to 2022-03-31 |
2021-04-01 to 2022-03-31 |
2021-04-01 to 2022-03-31 |
2021-04-01 to 2022-03-31 |
2021-04-01 to 2022-03-31 |
2021-04-01 to 2022-03-31 |
2021-04-01 to 2022-03-31 |
2021-04-01 to 2022-03-31 |
2020-04-01 to 2021-03-31 |
2020-04-01 to 2021-03-31 |
2020-04-01 to 2021-03-31 |
2020-04-01 to 2021-03-31 |
2020-04-01 to 2021-03-31 |
2020-04-01 to 2021-03-31 |
2020-04-01 to 2021-03-31 |
2020-04-01 to 2021-03-31 |
2020-04-01 to 2021-03-31 |
2020-04-01 to 2021-03-31 |
2020-04-01 to 2021-03-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of comprehensive income [abstract] | ||||||||||||||||||||||
| Profit (loss) |
151,000,000
GBP
|
–
GBP
|
19,000,000
GBP
|
–
GBP
|
151,000,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
170,000,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
79,000,000
GBP
|
–
GBP
|
–
GBP
|
68,000,000
GBP
|
–
GBP
|
11,000,000
GBP
|
68,000,000
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) from investments in equity instruments | — | — | — | — | — | — | — | — | — |
4,000,000
GBP
|
— | — | — | — | — |
–
GBP
|
— | — | — | — | — | — |
| Other comprehensive income that will not be reclassified to profit or loss, net of tax | — | — | — | — | — | — | — | — | — |
70,000,000
GBP
|
— | — | — | — | — |
127,000,000
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 | — | — | — | — | — | — | — | — | — |
182,000,000
GBP
|
— | — | — | — | — |
235,000,000
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 | — | — | — | — | — | — | — | — | — |
1,000,000
GBP
|
— | — | — | — | — |
–
GBP
|
— | — | — | — | — | — |
| Other comprehensive income that will be reclassified to profit or loss, net of tax | — | — | — | — | — | — | — | — | — |
188,000,000
GBP
|
— | — | — | — | — |
235,000,000
GBP
|
— | — | — | — | — | — |
| Other comprehensive income |
107,000,000
GBP
|
–
GBP
|
11,000,000
GBP
|
1 74
GBP
|
77,000,000
GBP
|
4,000,000
GBP
|
–
GBP
|
6,000,000
GBP
|
–
GBP
|
118,000,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
237,000,000
GBP
|
–
GBP
|
108,000,000
GBP
|
–
GBP
|
–
GBP
|
1 24
GBP
|
–
GBP
|
5,000,000
GBP
|
113,000,000
GBP
|
| Comprehensive income |
258,000,000
GBP
|
–
GBP
|
30,000,000
GBP
|
1 74
GBP
|
74,000,000
GBP
|
4,000,000
GBP
|
–
GBP
|
6,000,000
GBP
|
–
GBP
|
288,000,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
237,000,000
GBP
|
–
GBP
|
29,000,000
GBP
|
–
GBP
|
–
GBP
|
192,000,000
GBP
|
–
GBP
|
16,000,000
GBP
|
45,000,000
GBP
|
| Comprehensive income attributable to [abstract] | ||||||||||||||||||||||
| Comprehensive income, attributable to owners of parent | — | — | — | — | — | — | — | — | — |
258,000,000
GBP
|
— | — | — | — | — |
45,000,000
GBP
|
— | — | — | — | — | — |
| Comprehensive income, attributable to non-controlling interests | — | — | — | — | — | — | — | — | — |
30,000,000
GBP
|
— | — | — | — | — |
16,000,000
GBP
|
— | — | — | — | — | — |