Statement Of Changes In Equity [Abstract]
| Concept |
As at 2025-03-29 |
2024-03-31 to 2025-03-29 |
As at 2025-03-29 |
As at 2025-03-29 |
2024-03-31 to 2025-03-29 |
As at 2025-03-29 |
2024-03-31 to 2025-03-29 |
2024-03-31 to 2025-03-29 |
2024-03-31 to 2025-03-29 |
2024-03-31 to 2025-03-29 |
As at 2025-03-29 |
2024-03-31 to 2025-03-29 |
As at 2025-03-29 |
As at 2025-03-29 |
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 |
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 |
As at 2024-03-30 |
2023-04-01 to 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 |
As at 2023-04-01 |
As at 2023-04-01 |
As at 2023-04-01 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | ||||||||||||||||||||||||||||||||||||
| Statement of changes in equity [line items] | ||||||||||||||||||||||||||||||||||||
| Equity |
–
GBP
|
— |
7,000,000
GBP
|
217,000,000
GBP
|
— |
914,000,000
GBP
|
— | — | — | — |
921,000,000
GBP
|
— |
466,000,000
GBP
|
231,000,000
GBP
|
–
GBP
|
231,000,000
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
|
| Changes in equity [abstract] | ||||||||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | ||||||||||||||||||||||||||||||||||||
| Profit (loss) | — |
–
GBP
|
— | — |
–
GBP
|
— |
–
GBP
|
75,000,000
GBP
|
–
GBP
|
75,000,000
GBP
|
— |
75,000,000
GBP
|
— | — | — | — |
270,000,000
GBP
|
271,000,000
GBP
|
–
GBP
|
–
GBP
|
— | — | — | — | — |
271,000,000
GBP
|
–
GBP
|
1,000,000
GBP
|
270,000,000
GBP
|
— | — | — | — | — | — | — |
| Other comprehensive income | — | — | — | — | — | — | — | — | — |
24,000,000
GBP
|
— | — | — | — | — | — | — |
36,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Comprehensive income | — |
–
GBP
|
— | — |
24,000,000
GBP
|
— |
–
GBP
|
99,000,000
GBP
|
–
GBP
|
99,000,000
GBP
|
— |
75,000,000
GBP
|
— | — | — | — |
270,000,000
GBP
|
235,000,000
GBP
|
–
GBP
|
–
GBP
|
— | — | — | — | — | — |
36,000,000
GBP
|
1,000,000
GBP
|
234,000,000
GBP
|
— | — | — | — | — | — | — |