Statement Of Cash Flows [Abstract]
| Concept |
2023-01-01 to 2023-12-31 |
2022-01-01 to 2022-12-31 |
|---|---|---|
| Statement of cash flows [abstract] | ||
| Cash flows from (used in) operating activities [abstract] | ||
| 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
|