Statement Of Financial Position [Abstract]
| Concept |
As at 2024-12-31 |
As at 2024-12-31 |
As at 2024-12-31 |
As at 2024-12-31 |
As at 2024-12-31 |
As at 2024-12-31 |
As at 2024-12-31 |
As at 2024-12-31 |
As at 2024-12-31 |
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 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of financial position [abstract] | |||||||||||||||||||||||||||
| Assets [abstract] | |||||||||||||||||||||||||||
| Non-current assets [abstract] | |||||||||||||||||||||||||||
| Investment property | — | — | — | — | — | — | — | — |
14,385,000,000
GBP
|
15,422,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Investments accounted for using equity method | — | — | — | — | — | — | — | — |
284,000,000
GBP
|
287,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Deferred tax assets | — | — | — | — | — | — | — | — |
487,000,000
GBP
|
443,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Current assets [abstract] | |||||||||||||||||||||||||||
| Cash and cash equivalents | — | — | — | — | — | — | — | — |
4,838,000,000
GBP
|
5,148,000,000
GBP
|
— | — | — | — | — | — | — | — |
4,739,000,000
GBP
|
— | — | — | — | — | — | — | — |
| Assets | — | — | — | — | — | — | — | — |
184,224,000,000
GBP
|
189,180,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Equity and liabilities [abstract] | |||||||||||||||||||||||||||
| Equity [abstract] | |||||||||||||||||||||||||||
| Issued capital | — | — | — | — | — | — | — | — |
120,000,000
GBP
|
119,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Retained earnings | — | — | — | — | — | — | — | — |
14,435,000,000
GBP
|
15,223,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Share premium | — | — | — | — | — | — | — | — |
383,000,000
GBP
|
379,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Treasury shares | — | — | — | — | — | — | — | — |
6,000,000
GBP
|
21,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Other reserves | — | — | — | — | — | — | — | — |
11,642,000,000
GBP
|
11,633,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Equity attributable to owners of parent | — | — | — | — | — | — | — | — |
3,281,000,000
GBP
|
4,041,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Non-controlling interests | — | — | — | — | — | — | — | — |
42,000,000
GBP
|
43,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Equity |
14,435,000,000
GBP
|
383,000,000
GBP
|
120,000,000
GBP
|
42,000,000
GBP
|
6,000,000
GBP
|
3,281,000,000
GBP
|
11,642,000,000
GBP
|
9,000,000
GBP
|
3,323,000,000
GBP
|
4,084,000,000
GBP
|
15,223,000,000
GBP
|
11,633,000,000
GBP
|
43,000,000
GBP
|
379,000,000
GBP
|
119,000,000
GBP
|
21,000,000
GBP
|
4,041,000,000
GBP
|
26,000,000
GBP
|
4,311,000,000
GBP
|
11,613,000,000
GBP
|
48,000,000
GBP
|
370,000,000
GBP
|
15,504,000,000
GBP
|
47,000,000
GBP
|
119,000,000
GBP
|
4,263,000,000
GBP
|
70,000,000
GBP
|
| Liabilities [abstract] | |||||||||||||||||||||||||||
| Non-current liabilities [abstract] | |||||||||||||||||||||||||||
| Deferred tax liabilities | — | — | — | — | — | — | — | — |
705,000,000
GBP
|
682,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Current liabilities [abstract] | |||||||||||||||||||||||||||
| Liabilities included in disposal groups classified as held for sale | — | — | — | — | — | — | — | — |
1,073,000,000
GBP
|
665,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Liabilities | — | — | — | — | — | — | — | — |
180,901,000,000
GBP
|
185,096,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Equity and liabilities | — | — | — | — | — | — | — | — |
184,224,000,000
GBP
|
189,180,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |