Statement Of Cash Flows [Abstract]
| Concept |
2023-01-01 to 2023-12-31 |
As at 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 |
As at 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 |
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) |
1,019,000,000
GBP
|
— |
1,019,000,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
1,019,000,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
— |
–
GBP
|
–
GBP
|
303,000,000
GBP
|
308,000,000
GBP
|
5,000,000
GBP
|
–
GBP
|
–
GBP
|
308,000,000
GBP
|
–
GBP
|
–
GBP
|
| Cash flows from (used in) operating activities |
29,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
204,000,000
GBP
|
— | — | — | — | — | — | — |
| Cash flows from (used in) investing activities [abstract] | ||||||||||||||||||||||
| Cash flows from losing control of subsidiaries or other businesses, classified as investing activities |
320,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
478,000,000
GBP
|
— | — | — | — | — | — | — |
| Cash flows used in obtaining control of subsidiaries or other businesses, classified as investing activities |
–
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
4,000,000
GBP
|
— | — | — | — | — | — | — |
| Proceeds from sales of property, plant and equipment, classified as investing activities |
4,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
45,000,000
GBP
|
— | — | — | — | — | — | — |
| Purchase of property, plant and equipment, classified as investing activities |
95,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
69,000,000
GBP
|
— | — | — | — | — | — | — |
| Cash receipts from repayment of advances and loans made to other parties, classified as investing activities |
1,205,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
–
GBP
|
— | — | — | — | — | — | — |
| Interest received, classified as investing activities |
2,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
1,000,000
GBP
|
— | — | — | — | — | — | — |
| Cash flows from (used in) investing activities |
721,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
192,000,000
GBP
|
— | — | — | — | — | — | — |
| Cash flows from (used in) financing activities [abstract] | ||||||||||||||||||||||
| Proceeds from borrowings, classified as financing activities |
628,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
632,000,000
GBP
|
— | — | — | — | — | — | — |
| Repayments of borrowings, classified as financing activities |
1,371,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
598,000,000
GBP
|
— | — | — | — | — | — | — |
| Payments of lease liabilities, classified as financing activities |
32,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
29,000,000
GBP
|
— | — | — | — | — | — | — |
| Cash flows from (used in) financing activities |
966,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
599,000,000
GBP
|
— | — | — | — | — | — | — |
| Increase (decrease) in cash and cash equivalents before effect of exchange rate changes |
216,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
203,000,000
GBP
|
— | — | — | — | — | — | — |
| Effect of exchange rate changes on cash and cash equivalents [abstract] | ||||||||||||||||||||||
| Effect of exchange rate changes on cash and cash equivalents |
19,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
27,000,000
GBP
|
— | — | — | — | — | — | — |
| Cash and cash equivalents | — |
58,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
355,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |