Statement Of Changes In Equity [Abstract]
| Concept |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | ||||||||||||||||||
| Statement of changes in equity [line items] | ||||||||||||||||||
| Increase (decrease) through appropriation of retained earnings, equity | — | — | — | — | — | — | — | — | — |
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
1,000,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
1,000,000
GBP
|
| Increase (decrease) through transactions with owners, equity |
1,000,000
GBP
|
1,000,000
GBP
|
–
GBP
|
36 6
GBP
|
329,000,000
GBP
|
–
GBP
|
668,000,000
GBP
|
–
GBP
|
25,000,000
GBP
|
–
GBP
|
12 4
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
9,000,000
GBP
|
9,000,000
GBP
|
2 92
GBP
|
16 8
GBP
|