Statement Of Changes In Equity [Abstract]
| Concept |
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 |
2021-03-28 to 2022-04-02 |
2021-03-28 to 2022-04-02 |
2021-03-28 to 2022-04-02 |
2021-03-28 to 2022-04-02 |
2021-03-28 to 2022-04-02 |
2021-03-28 to 2022-04-02 |
2021-03-28 to 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 |
As at 2022-04-02 |
As at 2021-03-27 |
As at 2021-03-27 |
As at 2021-03-27 |
As at 2021-03-27 |
As at 2021-03-27 |
As at 2021-03-27 |
As at 2021-03-27 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | |||||||||||||||||||||||||||||||||||
| Statement of changes in equity [line items] | |||||||||||||||||||||||||||||||||||
| Equity |
–
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
|
— | — | — | — | — | — | — |
1,12 3
GBP
|
227,000,000
GBP
|
–
GBP
|
1,617,000,000
GBP
|
263,000,000
GBP
|
1,613,000,000
GBP
|
4,000,000
GBP
|
242,000,000
GBP
|
1,092,000,000
GBP
|
1,560,000,000
GBP
|
223,000,000
GBP
|
1,557,000,000
GBP
|
–
GBP
|
3,000,000
GBP
|
| Changes in equity [abstract] | |||||||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | |||||||||||||||||||||||||||||||||||
| Profit (loss) | — | — | — | — |
–
GBP
|
492,000,000
GBP
|
4 90
GBP
|
–
GBP
|
–
GBP
|
490,000,000
GBP
|
2,000,000
GBP
|
— | — | — |
397,000,000
GBP
|
–
GBP
|
–
GBP
|
3 96
GBP
|
396,000,000
GBP
|
–
GBP
|
1,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Other comprehensive income | — | — | — | — | — |
14,000,000
GBP
|
— | — | — | — | — | — | — | — |
21,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Comprehensive income | — | — | — | — |
–
GBP
|
506,000,000
GBP
|
4 90
GBP
|
–
GBP
|
14,000,000
GBP
|
504,000,000
GBP
|
2,000,000
GBP
|
— | — | — |
418,000,000
GBP
|
21,000,000
GBP
|
–
GBP
|
41 7
GBP
|
396,000,000
GBP
|
–
GBP
|
1,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |