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 |
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | ||||||||||||||
| Statement of changes in equity [line items] | ||||||||||||||
| Dividends recognised as distributions to owners of parent |
219,000,000
GBP
|
–
GBP
|
–
GBP
|
219,000,000
GBP
|
219,000,000
GBP
|
–
GBP
|
–
GBP
|
— | — | — | — | — | — | — |
| Increase (decrease) through acquisition of subsidiary, equity | — | — | — | — | — | — | — |
–
GBP
|
–
GBP
|
2,000,000
GBP
|
2,000,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
| Increase (decrease) through exercise of options, equity |
4,000,000
GBP
|
–
GBP
|
4,000,000
GBP
|
4,000,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
2,000,000
GBP
|
–
GBP
|
2,000,000
GBP
|
–
GBP
|
–
GBP
|
2,000,000
GBP
|
–
GBP
|
| Decrease (increase) through tax on share-based payment transactions, equity | — | — | — | — | — | — | — |
–
GBP
|
–
GBP
|
1,000,000
GBP
|
–
GBP
|
–
GBP
|
1,000,000
GBP
|
1,000,000
GBP
|
| Purchase of treasury shares |
153,000,000
GBP
|
–
GBP
|
–
GBP
|
153,000,000
GBP
|
153,000,000
GBP
|
–
GBP
|
–
GBP
|
— | — | — | — | — | — | — |