Statement Of Financial Position [Abstract]
| Concept |
As at 2023-12-31 |
As at 2023-12-31 |
As at 2023-12-31 |
As at 2023-12-31 |
As at 2023-12-31 |
As at 2023-12-31 |
As at 2023-12-31 |
As at 2023-12-31 |
As at 2023-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-01-01 |
As at 2022-01-01 |
As at 2022-01-01 |
As at 2022-01-01 |
As at 2022-01-01 |
As at 2022-01-01 |
As at 2022-01-01 |
As at 2022-01-01 |
As at 2022-01-01 |
As at 2022-01-01 |
As at 2022-01-01 |
As at 2022-01-01 |
As at 2022-01-01 |
As at 2022-01-01 |
As at 2022-01-01 |
As at 2022-01-01 |
As at 2022-01-01 |
As at 2022-01-01 |
As at 2022-01-01 |
As at 2022-01-01 |
As at 2022-01-01 |
As at 2022-01-01 |
As at 2022-01-01 |
As at 2022-01-01 |
As at 2022-01-01 |
As at 2022-01-01 |
As at 2022-01-01 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of financial position [abstract] | |||||||||||||||||||||||||||||||||||||||||||||
| Assets [abstract] | |||||||||||||||||||||||||||||||||||||||||||||
| Property, plant and equipment |
22,000,000.000000
GBP
|
— | — | — | — | — | — | — | — |
22,000,000.000000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
14,000,000.000000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Investment property |
32,000,000.000000
GBP
|
— | — | — | — | — | — | — | — |
40,000,000.000000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
70,000,000.000000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Investments accounted for using equity method |
149,000,000.000000
GBP
|
— | — | — | — | — | — | — | — |
194,000,000.000000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
–
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Current tax assets |
4,000,000.000000
GBP
|
— | — | — | — | — | — | — | — |
6,000,000.000000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
30,000,000.000000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Deferred tax assets |
406,000,000.000000
GBP
|
— | — | — | — | — | — | — | — |
449,000,000.000000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
304,000,000.000000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Trade and other receivables |
60,000,000.000000
GBP
|
— | — | — | — | — | — | — | — |
33,000,000.000000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
21,000,000.000000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Assets |
31,838,000,000.000000
GBP
|
— | — | — | — | — | — | — | — |
25,412,000,000.000000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
26,401,000,000.000000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Equity and liabilities [abstract] | |||||||||||||||||||||||||||||||||||||||||||||
| Equity [abstract] | |||||||||||||||||||||||||||||||||||||||||||||
| Issued capital |
104,000,000.000000
GBP
|
— | — | — | — | — | — | — | — |
104,000,000.000000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
104,000,000.000000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Retained earnings |
259,000,000.000000
GBP
|
— | — | — | — | — | — | — | — |
354,000,000.000000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
33,000,000.000000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Share premium |
95,000,000.000000
GBP
|
— | — | — | — | — | — | — | — |
95,000,000.000000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
95,000,000.000000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Other reserves |
943,000,000.000000
GBP
|
— | — | — | — | — | — | — | — |
938,000,000.000000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
944,000,000.000000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Equity attributable to owners of parent |
883,000,000.000000
GBP
|
— | — | — | — | — | — | — | — |
783,000,000.000000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
1,176,000,000.000000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Non-controlling interests |
2,000,000.000000
GBP
|
— | — | — | — | — | — | — | — |
2,000,000.000000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
2,000,000.000000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Equity |
1,203,000,000.000000
GBP
|
259,000,000.000000
GBP
|
943,000,000.000000
GBP
|
2,000,000.000000
GBP
|
95,000,000.000000
GBP
|
104,000,000.000000
GBP
|
883,000,000.000000
GBP
|
1,205,000,000.000000
GBP
|
322,000,000.000000
GBP
|
1,103,000,000.000000
GBP
|
938,000,000.000000
GBP
|
2,000,000.000000
GBP
|
95,000,000.000000
GBP
|
354,000,000.000000
GBP
|
104,000,000.000000
GBP
|
783,000,000.000000
GBP
|
322,000,000.000000
GBP
|
1,105,000,000.000000
GBP
|
–
GBP
|
1,176,000,000.000000
GBP
|
33,000,000.000000
GBP
|
95,000,000.000000
GBP
|
104,000,000.000000
GBP
|
2,000,000.000000
GBP
|
977,000,000.000000
GBP
|
944,000,000.000000
GBP
|
1,496,000,000.000000
GBP
|
944,000,000.000000
GBP
|
104,000,000.000000
GBP
|
2,000,000.000000
GBP
|
2,440,000,000.000000
GBP
|
95,000,000.000000
GBP
|
2,120,000,000.000000
GBP
|
944,000,000
GBP
|
944,000,000
GBP
|
–
GBP
|
–
GBP
|
944,000,000
GBP
|
–
GBP
|
–
GBP
|
944,000,000
GBP
|
2,442,000,000.000000
GBP
|
322,000,000.000000
GBP
|
1,498,000,000.000000
GBP
|
322,000,000.000000
GBP
|
| Liabilities [abstract] | |||||||||||||||||||||||||||||||||||||||||||||
| Trade and other payables |
20,000,000.000000
GBP
|
— | — | — | — | — | — | — | — |
96,000,000.000000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
81,000,000.000000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Provisions [abstract] | |||||||||||||||||||||||||||||||||||||||||||||
| Other provisions |
3,000,000.000000
GBP
|
— | — | — | — | — | — | — | — |
1,000,000.000000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
1,000,000.000000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Other financial liabilities |
5,588,000,000.000000
GBP
|
— | — | — | — | — | — | — | — |
3,669,000,000.000000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
721,000,000.000000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Insurance contracts issued that are liabilities |
24,131,000,000.000000
GBP
|
— | — | — | — | — | — | — | — |
19,647,000,000.000000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
23,086,000,000.000000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Reinsurance contracts held that are liabilities |
125,000,000.000000
GBP
|
— | — | — | — | — | — | — | — |
121,000,000.000000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
165,000,000.000000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Liabilities |
30,635,000,000.000000
GBP
|
— | — | — | — | — | — | — | — |
24,309,000,000.000000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
24,905,000,000.000000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Equity and liabilities |
31,838,000,000.000000
GBP
|
— | — | — | — | — | — | — | — |
25,412,000,000.000000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
26,401,000,000.000000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |