Statement Of Changes In Equity [Abstract]
| Concept |
As at 2024-03-30 |
As at 2024-03-30 |
2023-04-02 to 2024-03-30 |
2023-04-02 to 2024-03-30 |
2023-04-02 to 2024-03-30 |
As at 2024-03-30 |
2023-04-02 to 2024-03-30 |
As at 2024-03-30 |
As at 2024-03-30 |
As at 2024-03-30 |
As at 2024-03-30 |
2023-04-02 to 2024-03-30 |
2023-04-02 to 2024-03-30 |
2023-04-02 to 2024-03-30 |
As at 2023-04-01 |
As at 2023-04-01 |
As at 2023-04-01 |
As at 2023-04-01 |
2022-04-03 to 2023-04-01 |
2022-04-03 to 2023-04-01 |
2022-04-03 to 2023-04-01 |
2022-04-03 to 2023-04-01 |
2022-04-03 to 2023-04-01 |
2022-04-03 to 2023-04-01 |
2022-04-03 to 2023-04-01 |
As at 2023-04-01 |
As at 2023-04-01 |
As at 2023-04-01 |
As at 2022-04-02 |
As at 2022-04-02 |
As at 2022-04-02 |
As at 2022-04-02 |
As at 2022-04-02 |
As at 2022-04-02 |
As at 2022-04-02 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | |||||||||||||||||||||||||||||||||||
| Statement of changes in equity [line items] | |||||||||||||||||||||||||||||||||||
| Equity |
–
GBP
|
23 1
GBP
|
— | — | — |
241,000,000
GBP
|
— |
1,147,000,000
GBP
|
7,000,000
GBP
|
675,000,000
GBP
|
1,154,000,000
GBP
|
— | — | — |
–
GBP
|
1,539,000,000
GBP
|
1,026,000,000
GBP
|
230,000,000
GBP
|
— | — | — | — | — | — | — |
277,000,000
GBP
|
1,533,000,000
GBP
|
6,000,000
GBP
|
1,123,000,000
GBP
|
227,000,000
GBP
|
–
GBP
|
1,617,000,000
GBP
|
263,000,000
GBP
|
4,000,000
GBP
|
1,613,000,000
GBP
|
| Changes in equity [abstract] | |||||||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | |||||||||||||||||||||||||||||||||||
| Profit (loss) | — | — |
2 70
GBP
|
271,000,000
GBP
|
–
GBP
|
— |
–
GBP
|
— | — | — | — |
–
GBP
|
1,000,000
GBP
|
270,000,000
GBP
|
— | — | — | — |
–
GBP
|
492,000,000
GBP
|
490,000,000
GBP
|
–
GBP
|
–
GBP
|
490,000,000
GBP
|
2,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Other comprehensive income | — | — | — |
36,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
14,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Comprehensive income | — | — |
27 0
GBP
|
235,000,000
GBP
|
–
GBP
|
— |
–
GBP
|
— | — | — | — |
36,000,000
GBP
|
1,000,000
GBP
|
234,000,000
GBP
|
— | — | — | — |
–
GBP
|
506,000,000
GBP
|
490,000,000
GBP
|
–
GBP
|
14,000,000
GBP
|
504,000,000
GBP
|
2,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |