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 |
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) |
14,000,000
GBP
|
— |
435,000,000
GBP
|
— | — | — | — |
421,000,000
GBP
|
421,000,000
GBP
|
— | — |
283,000,000
GBP
|
13,000,000
GBP
|
— |
270,000,000
GBP
|
— |
270,000,000
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 | — | — |
3,000,000
GBP
|
— | — | — | — | — | — | — | — |
3,000,000
GBP
|
— | — | — | — | — | — |
| Other comprehensive income, before tax, gains (losses) on remeasurements of defined benefit plans | — | — |
46,000,000
GBP
|
— | — | — | — | — | — | — | — |
20,000,000
GBP
|
— | — | — | — | — | — |
| Components of other comprehensive income that will be reclassified to profit or loss, before tax [abstract] | ||||||||||||||||||
| Exchange differences on translation [abstract] | ||||||||||||||||||
| Reclassification adjustments on exchange differences on translation of foreign operations, before tax | — | — |
4,000,000
GBP
|
— | — | — | — | — | — | — | — |
1,000,000
GBP
|
— | — | — | — | — | — |
| Other comprehensive income, before tax, exchange differences on translation of foreign operations | — | — |
245,000,000
GBP
|
— | — | — | — | — | — | — | — |
133,000,000
GBP
|
— | — | — | — | — | — |
| Cash flow hedges [abstract] | ||||||||||||||||||
| Other comprehensive income, before tax, cash flow hedges | — | — |
22,000,000
GBP
|
— | — | — | — | — | — | — | — |
48,000,000
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 | — | — |
1,000,000
GBP
|
— | — | — | — | — | — | — | — |
1,000,000
GBP
|
— | — | — | — | — | — |
| Income tax relating to components of other comprehensive income that will be reclassified to profit or loss [abstract] | ||||||||||||||||||
| Income tax relating to cash flow hedges included in other comprehensive income | — | — |
14,000,000
GBP
|
— | — | — | — | — | — | — | — |
17,000,000
GBP
|
— | — | — | — | — | — |
| Income tax relating to components of other comprehensive income that will be reclassified to profit or loss | — | — |
—
GBP
|
— | — | — | — | — | — | — | — |
—
GBP
|
— | — | — | — | — | — |
| Other comprehensive income |
1,000,000
GBP
|
— |
289,000,000
GBP
|
— | — | — |
241,000,000
GBP
|
47,000,000
GBP
|
288,000,000
GBP
|
— | — |
153,000,000
GBP
|
3,000,000
GBP
|
— |
20,000,000
GBP
|
— |
150,000,000
GBP
|
130,000,000
GBP
|
| Comprehensive income |
13,000,000
GBP
|
—
GBP
|
146,000,000
GBP
|
—
GBP
|
—
GBP
|
—
GBP
|
241,000,000
GBP
|
374,000,000
GBP
|
133,000,000
GBP
|
—
GBP
|
—
GBP
|
130,000,000
GBP
|
10,000,000
GBP
|
—
GBP
|
250,000,000
GBP
|
—
GBP
|
120,000,000
GBP
|
130,000,000
GBP
|
| Comprehensive income attributable to [abstract] | ||||||||||||||||||
| Comprehensive income, attributable to owners of parent | — | — |
133,000,000
GBP
|
— | — | — | — | — | — | — | — |
120,000,000
GBP
|
— | — | — | — | — | — |
| Comprehensive income, attributable to non-controlling interests | — | — |
13,000,000
GBP
|
— | — | — | — | — | — | — | — |
10,000,000
GBP
|
— | — | — | — | — | — |