Analysis Of Income And Expense [Abstract]
| Concept |
2023-01-01 to 2023-12-31 |
2023-01-01 to 2023-12-31 |
2023-01-01 to 2023-12-31 |
2023-01-01 to 2023-12-31 |
2023-01-01 to 2023-12-31 |
2023-01-01 to 2023-12-31 |
2023-01-01 to 2023-12-31 |
2023-01-01 to 2023-12-31 |
2023-01-01 to 2023-12-31 |
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 |
2022-01-01 to 2022-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Analysis of income and expense [abstract] | ||||||||||||||||||
| Revenue [abstract] | ||||||||||||||||||
| Revenue | — | — |
11 , 4 4 7
GBP
|
— | — | — | — | — | — | — | — | — |
8 ,13 3
GBP
|
— | — | — | — | — |
| Material income and expense [abstract] | ||||||||||||||||||
| Finance income (cost) | — | — |
2 07
GBP
|
— | — | — | — | — | — | — | — | — |
67,000,000
GBP
|
— | — | — | — | — |
| Operating expense | — | — |
1, 3 2 0
GBP
|
— | — | — | — | — | — | — | — | — |
925,000,000
GBP
|
— | — | — | — | — |
| Miscellaneous other comprehensive income [abstract] | ||||||||||||||||||
| Other comprehensive income, before tax, exchange differences on translation of foreign operations and hedges of net investments in foreign operations [abstract] | ||||||||||||||||||
| Other comprehensive income, before tax, exchange differences on translation of foreign operations | — | — |
13 3
GBP
|
— | — | — | — | — | — | — | — | — |
13 3
GBP
|
— | — | — | — | — |
| Share of profit (loss) of associates and joint ventures accounted for using equity method [abstract] | ||||||||||||||||||
| Share of profit (loss) of associates and joint ventures accounted for using equity method | — | — |
1,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
–
GBP
|
— | — | — | — | — |
| Income tax relating to components of other comprehensive income [abstract] | ||||||||||||||||||
| Income tax relating to components of other comprehensive income that will be reclassified to profit or loss | — | — |
1,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
–
GBP
|
— | — | — | — | — |
| Comprehensive income, continuing and discontinued operations [abstract] | ||||||||||||||||||
| Comprehensive income from continuing operations | — | — |
13 0
GBP
|
— | — | — | — | — | — | — | — | — |
405,000,000
GBP
|
— | — | — | — | — |
| Comprehensive income from discontinued operations | — | — |
–
GBP
|
— | — | — | — | — | — | — | — | — |
12 3
GBP
|
— | — | — | — | — |
| Comprehensive income |
–
GBP
|
–
GBP
|
13 0
GBP
|
10,000,000
GBP
|
–
GBP
|
25 0
GBP
|
–
GBP
|
12 0
GBP
|
13 0
GBP
|
–
GBP
|
2 71
GBP
|
2 94
GBP
|
282,000,000
GBP
|
–
GBP
|
–
GBP
|
23,000,000
GBP
|
11,000,000
GBP
|
–
GBP
|
| Comprehensive income attributable to owners of parent, continuing and discontinued operations [abstract] | ||||||||||||||||||
| Comprehensive income, attributable to owners of parent | — | — |
12 0
GBP
|
— | — | — | — | — | — | — | — | — |
2 71
GBP
|
— | — | — | — | — |
| Comprehensive income attributable to non-controlling interests, continuing and discontinued operations [abstract] | ||||||||||||||||||
| Comprehensive income, attributable to non-controlling interests | — | — |
10,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
11,000,000
GBP
|
— | — | — | — | — |