Statement Of Cash Flows [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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of cash flows [abstract] | ||||||||||||||||||
| Cash flows from (used in) operating activities [abstract] | ||||||||||||||||||
| Profit (loss) |
–
GBP
|
129,000,000.000000
GBP
|
–
GBP
|
129,000,000.000000
GBP
|
–
GBP
|
129,000,000.000000
GBP
|
–
GBP
|
129,000,000.000000
GBP
|
–
GBP
|
–
GBP
|
362,000,000.000000
GBP
|
–
GBP
|
362,000,000.000000
GBP
|
–
GBP
|
362,000,000.000000
GBP
|
–
GBP
|
362,000,000.000000
GBP
|
–
GBP
|
| Adjustments to reconcile profit (loss) [abstract] | ||||||||||||||||||
| Adjustments for impairment loss (reversal of impairment loss) recognised in profit or loss | — |
3,000,000.000000
GBP
|
— | — | — | — | — | — | — | — | — | — |
–
GBP
|
— | — | — | — | — |
| Adjustments for share-based payments | — |
1,000,000.000000
GBP
|
— | — | — | — | — | — | — | — | — | — |
3,000,000.000000
GBP
|
— | — | — | — | — |
| Adjustments for undistributed profits of associates | — |
14,000,000.000000
GBP
|
— | — | — | — | — | — | — | — | — | — |
3,000,000.000000
GBP
|
— | — | — | — | — |
| Interest received, classified as operating activities | — |
1,075,000,000.000000
GBP
|
— | — | — | — | — | — | — | — | — | — |
402,000,000.000000
GBP
|
— | — | — | — | — |
| Cash flows from (used in) operating activities | — |
141,000,000.000000
GBP
|
— | — | — | — | — | — | — | — | — | — |
201,000,000.000000
GBP
|
— | — | — | — | — |
| Cash flows from (used in) investing activities [abstract] | ||||||||||||||||||
| Cash flows used in obtaining control of subsidiaries or other businesses, classified as investing activities | — |
–
GBP
|
— | — | — | — | — | — | — | — | — | — |
197,000,000.000000
GBP
|
— | — | — | — | — |
| Purchase of property, plant and equipment, classified as investing activities | — |
3,000,000.000000
GBP
|
— | — | — | — | — | — | — | — | — | — |
4,000,000.000000
GBP
|
— | — | — | — | — |
| Purchase of intangible assets, classified as investing activities | — |
–
GBP
|
— | — | — | — | — | — | — | — | — | — |
4,000,000.000000
GBP
|
— | — | — | — | — |
| Proceeds from sales of other long-term assets, classified as investing activities | — |
1,000,000.000000
GBP
|
— | — | — | — | — | — | — | — | — | — |
3,000,000.000000
GBP
|
— | — | — | — | — |
| Cash flows from (used in) investing activities | — |
2,000,000.000000
GBP
|
— | — | — | — | — | — | — | — | — | — |
202,000,000.000000
GBP
|
— | — | — | — | — |
| Cash flows from (used in) financing activities [abstract] | ||||||||||||||||||
| Proceeds from borrowings, classified as financing activities | — |
26,000,000.000000
GBP
|
— | — | — | — | — | — | — | — | — | — |
76,000,000.000000
GBP
|
— | — | — | — | — |
| Dividends paid, classified as financing activities | — |
19,000,000.000000
GBP
|
— | — | — | — | — | — | — | — | — | — |
15,000,000.000000
GBP
|
— | — | — | — | — |
| Interest paid, classified as financing activities | — |
48,000,000.000000
GBP
|
— | — | — | — | — | — | — | — | — | — |
57,000,000.000000
GBP
|
— | — | — | — | — |
| Cash flows from (used in) financing activities | — |
110,000,000.000000
GBP
|
— | — | — | — | — | — | — | — | — | — |
168,000,000.000000
GBP
|
— | — | — | — | — |
| Increase (decrease) in cash and cash equivalents before effect of exchange rate changes | — |
29,000,000.000000
GBP
|
— | — | — | — | — | — | — | — | — | — |
169,000,000.000000
GBP
|
— | — | — | — | — |
| Effect of exchange rate changes on cash and cash equivalents [abstract] | ||||||||||||||||||
| Effect of exchange rate changes on cash and cash equivalents | — |
2,000,000.000000
GBP
|
— | — | — | — | — | — | — | — | — | — |
4,000,000.000000
GBP
|
— | — | — | — | — |