Statement Of Cash Flows [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 |
As at 2024-12-31 |
2023-01-01 to 2023-12-31 |
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 |
As at 2022-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of cash flows [abstract] | |||||||||||||||||||||
| Cash flows from (used in) operating activities [abstract] | |||||||||||||||||||||
| Profit (loss) |
—
GBP
|
—
GBP
|
360,000,000
GBP
|
—
GBP
|
—
GBP
|
360,000,000
GBP
|
13,000,000
GBP
|
347,000,000
GBP
|
—
GBP
|
— |
—
GBP
|
309,000,000
GBP
|
— |
297,000,000
GBP
|
—
GBP
|
12,000,000
GBP
|
297,000,000
GBP
|
—
GBP
|
—
GBP
|
—
GBP
|
— |
| Adjustments to reconcile profit (loss) [abstract] | |||||||||||||||||||||
| Adjustments for impairment loss (reversal of impairment loss) recognised in profit or loss | — | — | — | — | — | — | — |
15,000,000
GBP
|
— | — | — |
2,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Other adjustments for non-cash items | — | — | — | — | — | — | — |
286,000,000
GBP
|
— | — | — |
100,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Dividends received, classified as operating activities | — | — | — | — | — | — | — |
1,917,000,000
GBP
|
— | — | — |
2,364,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Interest paid, classified as operating activities | — | — | — | — | — | — | — |
359,000,000
GBP
|
— | — | — |
204,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Interest received, classified as operating activities | — | — | — | — | — | — | — |
3,312,000,000
GBP
|
— | — | — |
3,086,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Income taxes paid (refund), classified as operating activities | — | — | — | — | — | — | — |
514,000,000
GBP
|
— | — | — |
250,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Cash flows from (used in) operating activities | — | — | — | — | — | — | — |
677,000,000
GBP
|
— | — | — |
1,719,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Cash flows from (used in) investing activities [abstract] | |||||||||||||||||||||
| Cash flows from losing control of subsidiaries or other businesses, classified as investing activities | — | — | — | — | — | — | — |
451,000,000
GBP
|
— | — | — |
105,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Cash flows used in obtaining control of subsidiaries or other businesses, classified as investing activities | — | — | — | — | — | — | — |
31,000,000
GBP
|
— | — | — |
103,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Proceeds from sales of property, plant and equipment, classified as investing activities | — | — | — | — | — | — | — |
21,000,000
GBP
|
— | — | — |
1,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Purchase of property, plant and equipment, classified as investing activities | — | — | — | — | — | — | — |
289,000,000
GBP
|
— | — | — |
496,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Cash flows from (used in) investing activities | — | — | — | — | — | — | — |
152,000,000
GBP
|
— | — | — |
603,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Cash flows from (used in) financing activities [abstract] | |||||||||||||||||||||
| Proceeds from issuing shares | — | — | — | — | — | — | — |
5,000,000
GBP
|
— | — | — |
9,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Payments of lease liabilities, classified as financing activities | — | — | — | — | — | — | — |
28,000,000
GBP
|
— | — | — |
25,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Interest paid, classified as financing activities | — | — | — | — | — | — | — |
188,000,000
GBP
|
— | — | — |
189,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Cash flows from (used in) financing activities | — | — | — | — | — | — | — |
1,142,000,000
GBP
|
— | — | — |
680,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Increase (decrease) in cash and cash equivalents before effect of exchange rate changes | — | — | — | — | — | — | — |
313,000,000
GBP
|
— | — | — |
436,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Effect of exchange rate changes on cash and cash equivalents [abstract] | |||||||||||||||||||||
| Effect of exchange rate changes on cash and cash equivalents | — | — | — | — | — | — | — |
3,000,000
GBP
|
— | — | — |
27,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Cash and cash equivalents | — | — | — | — | — | — | — | — | — |
4,838,000,000
GBP
|
— | — |
5,148,000,000
GBP
|
— | — | — | — | — | — | — |
4,739,000,000
GBP
|