Statement Of Comprehensive Income [Abstract]
| Concept |
2024-01-01 to 2024-12-31 |
2024-01-01 to 2024-12-31 |
2024-01-01 to 2024-12-31 |
2024-01-01 to 2024-12-31 |
2024-01-01 to 2024-12-31 |
2024-01-01 to 2024-12-31 |
2024-01-01 to 2024-12-31 |
2024-01-01 to 2024-12-31 |
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of comprehensive income [abstract] | ||||||||||||||||||||||||
| Profit (loss) |
–
GBP
|
–
GBP
|
5 42
GBP
|
–
GBP
|
–
GBP
|
542,000,000
GBP
|
87,000,000
GBP
|
629,000,000
GBP
|
197,000,000
GBP
|
–
GBP
|
11 0
GBP
|
–
GBP
|
87,000,000
GBP
|
11 0
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
7 75
GBP
|
68 3
GBP
|
92,000,000
GBP
|
683,000,000
GBP
|
–
GBP
|
| Other comprehensive income [abstract] | ||||||||||||||||||||||||
| Components of other comprehensive income that will not be reclassified to profit or loss, before tax [abstract] | ||||||||||||||||||||||||
| Other comprehensive income, before tax, gains (losses) on remeasurements of defined benefit plans | — | — | — | — | — | — | — |
3,000,000
GBP
|
9,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
16,000,000
GBP
|
— | — | — | — |
| Income tax relating to components of other comprehensive income that will not be reclassified to profit or loss [abstract] | ||||||||||||||||||||||||
| Income tax relating to remeasurements of defined benefit plans included in other comprehensive income | — | — | — | — | — | — | — |
2,000,000
GBP
|
2,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
7,000,000
GBP
|
— | — | — | — |
| Other comprehensive income |
–
GBP
|
58,000,000
GBP
|
6 0
GBP
|
–
GBP
|
–
GBP
|
2,000,000
GBP
|
2,000,000
GBP
|
62,000,000
GBP
|
3 29
GBP
|
–
GBP
|
306,000,000
GBP
|
29 6
GBP
|
23,000,000
GBP
|
1 0
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
299,000,000
GBP
|
321,000,000
GBP
|
6,000,000
GBP
|
16,000,000
GBP
|
305,000,000
GBP
|
–
GBP
|
| Comprehensive income |
–
GBP
|
58,000,000
GBP
|
482,000,000
GBP
|
–
GBP
|
–
GBP
|
5 40
GBP
|
85,000,000
GBP
|
567,000,000
GBP
|
13 2
GBP
|
–
GBP
|
196,000,000
GBP
|
296,000,000
GBP
|
64,000,000
GBP
|
100,000,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
299,000,000
GBP
|
1,096,000,000
GBP
|
689,000,000
GBP
|
108,000,000
GBP
|
98 8
GBP
|
–
GBP
|
| Comprehensive income attributable to [abstract] | ||||||||||||||||||||||||
| Comprehensive income, attributable to owners of parent | — | — | — | — | — | — | — |
482,000,000
GBP
|
19 6
GBP
|
— | — | — | — | — | — | — | — | — | — |
98 8
GBP
|
— | — | — | — |
| Comprehensive income, attributable to non-controlling interests | — | — | — | — | — | — | — |
85,000,000
GBP
|
64,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
108,000,000
GBP
|
— | — | — | — |