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 |
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 |
2023-01-01 to 2023-12-31 |
2023-01-01 to 2023-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of comprehensive income [abstract] | ||||||||||||||||||||
| Profit (loss) |
–
GBP
|
49,000,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
49,000,000
GBP
|
–
GBP
|
49,000,000
GBP
|
–
GBP
|
1,019,000,000
GBP
|
1,019,000,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
1,019,000,000
GBP
|
–
GBP
|
–
GBP
|
–
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) from investments in equity instruments | — | — | — | — | — | — | — | — |
47,000,000
GBP
|
— |
35,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Other comprehensive income, before tax, gains (losses) on remeasurements of defined benefit plans | — | — | — | — | — | — | — | — |
27,000,000
GBP
|
— |
119,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Components of other comprehensive income that will be reclassified to profit or loss, before tax [abstract] | ||||||||||||||||||||
| Exchange differences on translation [abstract] | ||||||||||||||||||||
| Gains (losses) on exchange differences on translation of foreign operations, before tax | — | — | — | — | — | — | — | — |
6,000,000
GBP
|
— |
152,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Other comprehensive income, before tax, exchange differences on translation of foreign operations | — | — | — | — | — | — | — | — |
17,000,000
GBP
|
— |
195,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Cash flow hedges [abstract] | ||||||||||||||||||||
| Gains (losses) on cash flow hedges, before tax | — | — | — | — | — | — | — | — |
3,000,000
GBP
|
— |
2,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Share of other comprehensive income of associates and joint ventures accounted for using equity method that will be reclassified to profit or loss, before tax | — | — | — | — | — | — | — | — |
–
GBP
|
— |
12,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Income tax relating to components of other comprehensive income that will not be reclassified to profit or loss [abstract] | ||||||||||||||||||||
| Income tax relating to components of other comprehensive income that will not be reclassified to profit or loss | — | — | — | — | — | — | — | — |
4,000,000
GBP
|
— |
29,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Income tax relating to components of other comprehensive income that will be reclassified to profit or loss [abstract] | ||||||||||||||||||||
| Income tax relating to components of other comprehensive income that will be reclassified to profit or loss | — | — | — | — | — | — | — | — |
1,000,000
GBP
|
— |
8,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Other comprehensive income |
–
GBP
|
11,000,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
13,000,000
GBP
|
24,000,000
GBP
|
–
GBP
|
11,000,000
GBP
|
–
GBP
|
420,000,000
GBP
|
420,000,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
55,000,000
GBP
|
–
GBP
|
365,000,000
GBP
|
–
GBP
|
–
GBP
|
| Comprehensive income |
–
GBP
|
60,000,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
13,000,000
GBP
|
73,000,000
GBP
|
–
GBP
|
60,000,000
GBP
|
–
GBP
|
1,439,000,000
GBP
|
1,439,000,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
1,074,000,000
GBP
|
–
GBP
|
365,000,000
GBP
|
–
GBP
|
–
GBP
|