Statement Of Cash Flows [Abstract]
| Concept |
As at 2023-12-31 |
2023-01-01 to 2023-12-31 |
2022-01-01 to 2022-12-31 |
As at 2022-12-31 |
|---|---|---|---|---|
| Statement of cash flows [abstract] | ||||
| Cash flows from (used in) operating activities [abstract] | ||||
| Cash flows from (used in) operations | — |
900,000,000
GBP
|
619,000,000
GBP
|
— |
| Interest paid, classified as operating activities | — |
19 7
GBP
|
4 7
GBP
|
— |
| Interest received, classified as operating activities | — |
46,000,000
GBP
|
17,000,000
GBP
|
— |
| Income taxes paid (refund), classified as operating activities | — |
15 6
GBP
|
95,000,000
GBP
|
— |
| Cash flows from (used in) operating activities | — |
593,000,000
GBP
|
4 94
GBP
|
— |
| Cash flows from (used in) investing activities [abstract] | ||||
| Cash flows from losing control of subsidiaries or other businesses, classified as investing activities | — |
1,000,000
GBP
|
17,000,000
GBP
|
— |
| Cash flows used in obtaining control of subsidiaries or other businesses, classified as investing activities | — |
13 7
GBP
|
395,000,000
GBP
|
— |
| Proceeds from sales of property, plant and equipment, classified as investing activities | — |
31,000,000
GBP
|
10,000,000
GBP
|
— |
| Purchase of property, plant and equipment, classified as investing activities | — |
88,000,000
GBP
|
6 4
GBP
|
— |
| Purchase of intangible assets, classified as investing activities | — |
5,000,000
GBP
|
4,000,000
GBP
|
— |
| Cash flows from (used in) investing activities | — |
19 5
GBP
|
47 5
GBP
|
— |
| Cash flows from (used in) financing activities [abstract] | ||||
| Proceeds from borrowings, classified as financing activities | — |
3 50
GBP
|
60 0
GBP
|
— |
| Repayments of borrowings, classified as financing activities | — |
5 6 0
GBP
|
4,000,000
GBP
|
— |
| Payments of lease liabilities, classified as financing activities | — |
87,000,000
GBP
|
6 3
GBP
|
— |
| Dividends paid, classified as financing activities | — |
12 8
GBP
|
89,000,000
GBP
|
— |
| Cash flows from (used in) financing activities | — |
9 3 4
GBP
|
366,000,000
GBP
|
— |
| Increase (decrease) in cash and cash equivalents before effect of exchange rate changes | — |
536,000,000
GBP
|
385,000,000
GBP
|
— |
| Effect of exchange rate changes on cash and cash equivalents [abstract] | ||||
| Effect of exchange rate changes on cash and cash equivalents | — |
74,000,000
GBP
|
76,000,000
GBP
|
— |
| Cash and cash equivalents |
6 89
GBP
|
— | — |
1,064,000,000
GBP
|