Statement Of Changes In Equity [Abstract]
| Concept |
As at 2023-04-30 |
2022-05-01 to 2023-04-30 |
As at 2023-04-30 |
2022-05-01 to 2023-04-30 |
As at 2023-04-30 |
As at 2023-04-30 |
As at 2023-04-30 |
As at 2023-04-30 |
As at 2023-04-30 |
As at 2023-04-30 |
As at 2023-04-30 |
2022-05-01 to 2023-04-30 |
2022-05-01 to 2023-04-30 |
2022-05-01 to 2023-04-30 |
2022-05-01 to 2023-04-30 |
2022-05-01 to 2023-04-30 |
2022-05-01 to 2023-04-30 |
2022-05-01 to 2023-04-30 |
2022-05-01 to 2023-04-30 |
2022-05-01 to 2023-04-30 |
As at 2022-04-30 |
As at 2022-04-30 |
As at 2022-04-30 |
As at 2022-04-30 |
As at 2022-04-30 |
As at 2022-04-30 |
2021-05-01 to 2022-04-30 |
2021-05-01 to 2022-04-30 |
2021-05-01 to 2022-04-30 |
2021-05-01 to 2022-04-30 |
2021-05-01 to 2022-04-30 |
2021-05-01 to 2022-04-30 |
As at 2022-04-30 |
2021-05-01 to 2022-04-30 |
2021-05-01 to 2022-04-30 |
2021-05-01 to 2022-04-30 |
2021-05-01 to 2022-04-30 |
2021-05-01 to 2022-04-30 |
As at 2022-04-30 |
As at 2022-04-30 |
As at 2021-04-30 |
As at 2021-04-30 |
As at 2021-04-30 |
As at 2021-04-30 |
As at 2021-04-30 |
As at 2021-04-30 |
As at 2021-04-30 |
As at 2021-04-30 |
As at 2021-04-30 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||
| Statement of changes in equity [line items] | |||||||||||||||||||||||||||||||||||||||||||||||||
| Equity |
2,2 51
GBP
|
— |
4,087,000,000
GBP
|
— |
4,084,000,000
GBP
|
3,000,000
GBP
|
1,581,000,000
GBP
|
113,000,000
GBP
|
15,000,000
GBP
|
138,000,000
GBP
|
14,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
1,35 2
GBP
|
105,000,000
GBP
|
2, 248
GBP
|
4,232,000,000
GBP
|
2,000,000
GBP
|
137,000,000
GBP
|
— | — | — | — | — | — |
9,000,000
GBP
|
— | — | — | — | — |
4, 234
GBP
|
609,000,000
GBP
|
137,000,000
GBP
|
3,000,000
GBP
|
3,535,000,000
GBP
|
84,000,000
GBP
|
1,189,000,000
GBP
|
2,000,000
GBP
|
3,533,000,000
GBP
|
53,000,000
GBP
|
2,241,000,000
GBP
|
| Changes in equity [abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||
| Profit (loss) | — |
5 03
GBP
|
— |
–
GBP
|
— | — | — | — | — | — | — |
1,000,000
GBP
|
504,000,000
GBP
|
–
GBP
|
502,000,000
GBP
|
502,000,000
GBP
|
–
GBP
|
1,000,000
GBP
|
–
GBP
|
–
GBP
|
— | — | — | — | — | — |
–
GBP
|
35,000,000
GBP
|
315,000,000
GBP
|
–
GBP
|
280,000,000
GBP
|
280,000,000
GBP
|
— |
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
280,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Other comprehensive income | — |
370,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
5 89
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Comprehensive income | — |
133,000,000
GBP
|
— |
–
GBP
|
— | — | — | — | — | — | — | — | — |
–
GBP
|
13 2
GBP
|
508,000,000
GBP
|
120,000,000
GBP
|
1,000,000
GBP
|
–
GBP
|
4 96
GBP
|
— | — | — | — | — | — |
–
GBP
|
— | — |
–
GBP
|
334,000,000
GBP
|
869,000,000
GBP
|
— |
–
GBP
|
–
GBP
|
14,000,000
GBP
|
549,000,000
GBP
|
869,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Issue of equity | — |
4,000,000
GBP
|
— |
3,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
–
GBP
|
4,000,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
1,000,000
GBP
|
–
GBP
|
— | — | — | — | — | — |
–
GBP
|
— | — |
–
GBP
|
–
GBP
|
7,000,000
GBP
|
— |
–
GBP
|
7,000,000
GBP
|
–
GBP
|
–
GBP
|
7,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Dividends recognised as distributions to owners | — |
289,000,000
GBP
|
— |
–
GBP
|
— | — | — | — | — | — | — | — | — |
–
GBP
|
289,000,000
GBP
|
289,000,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
— | — | — | — | — | — |
–
GBP
|
— | — |
–
GBP
|
166,000,000
GBP
|
166,000,000
GBP
|
— |
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
166,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Increase (decrease) through other changes, equity | — |
2 80
GBP
|
— |
3,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
5,000,000
GBP
|
28 0
GBP
|
279,000,000
GBP
|
–
GBP
|
–
GBP
|
1,000,000
GBP
|
–
GBP
|
— | — | — | — | — | — |
6,000,000
GBP
|
— | — |
–
GBP
|
171,000,000
GBP
|
170,000,000
GBP
|
— |
–
GBP
|
7,000,000
GBP
|
7,000,000
GBP
|
7,000,000
GBP
|
170,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Increase (decrease) through share-based payment transactions, equity | — |
13,000,000
GBP
|
— |
–
GBP
|
— | — | — | — | — | — | — | — | — |
–
GBP
|
13,000,000
GBP
|
13,000,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
— | — | — | — | — | — |
–
GBP
|
— | — |
–
GBP
|
10,000,000
GBP
|
10,000,000
GBP
|
— |
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
10,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |