Statement Of Changes In Equity [Abstract]
| Concept |
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 |
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | ||||||||||||||
| Statement of changes in equity [line items] | ||||||||||||||
| Dividends recognised as distributions to owners of parent |
–
GBP
|
203,000,000
GBP
|
–
GBP
|
–
GBP
|
2 03
GBP
|
2 03
GBP
|
–
GBP
|
2 19
GBP
|
219,000,000
GBP
|
–
GBP
|
–
GBP
|
219,000,000
GBP
|
–
GBP
|
–
GBP
|
| Increase (decrease) through exercise of options, equity |
–
GBP
|
3,000,000
GBP
|
–
GBP
|
3,000,000
GBP
|
3,000,000
GBP
|
–
GBP
|
–
GBP
|
4,000,000
GBP
|
4,000,000
GBP
|
–
GBP
|
4,000,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
| Purchase of treasury shares |
–
GBP
|
404,000,000
GBP
|
–
GBP
|
–
GBP
|
404,000,000
GBP
|
404,000,000
GBP
|
–
GBP
|
1 53
GBP
|
153,000,000
GBP
|
–
GBP
|
–
GBP
|
1 53
GBP
|
–
GBP
|
–
GBP
|