Statement Of Changes In Equity [Abstract]
| Concept |
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 |
2020-03-29 to 2021-03-27 |
2020-03-29 to 2021-03-27 |
2020-03-29 to 2021-03-27 |
2020-03-29 to 2021-03-27 |
2020-03-29 to 2021-03-27 |
2020-03-29 to 2021-03-27 |
2020-03-29 to 2021-03-27 |
As at 2020-03-28 |
As at 2020-03-28 |
As at 2020-03-28 |
As at 2020-03-28 |
As at 2020-03-28 |
As at 2020-03-28 |
As at 2020-03-28 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | |||||||||||||||||||||||||||||||||||
| Statement of changes in equity [line items] | |||||||||||||||||||||||||||||||||||
| Equity | — | — | — | — | — | — | — |
1,123,000,000
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
|
–
GBP
|
223,000,000
GBP
|
1,557,000,000
GBP
|
3,000,000
GBP
|
— | — | — | — | — | — | — |
1,219,000,000
GBP
|
221,000,000
GBP
|
–
GBP
|
291,000,000
GBP
|
5,000,000
GBP
|
702,000,000
GBP
|
1,214,000,000
GBP
|
| Changes in equity [abstract] | |||||||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | |||||||||||||||||||||||||||||||||||
| Profit (loss) |
397,000,000
GBP
|
–
GBP
|
–
GBP
|
396,000,000
GBP
|
396,000,000
GBP
|
–
GBP
|
1,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
376,000,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
376,000,000
GBP
|
376,000,000
GBP
|
— | — | — | — | — | — | — |
| Other comprehensive income |
21,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
48,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
| Comprehensive income |
418,000,000
GBP
|
21,000,000
GBP
|
–
GBP
|
417,000,000
GBP
|
3 96
GBP
|
–
GBP
|
1,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
328,000,000
GBP
|
–
GBP
|
49,000,000
GBP
|
–
GBP
|
–
GBP
|
377,000,000
GBP
|
328,000,000
GBP
|
— | — | — | — | — | — | — |