Disclosure Of Fair Value Measurement [Text Block]
| Concept |
As at 2024-12-31 |
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2024-01-01 to 2024-12-31 |
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As at 2023-12-31 |
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As at 2022-12-31 |
As at 2022-12-31 |
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As at 2022-12-31 |
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| Disclosure of fair value measurement [text block] | — | — | — | — | — | — |
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— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Disclosure of fair value measurement of assets [text block] | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Disclosure of fair value measurement of assets [abstract] | |||||||||||||||||||||||||
| Disclosure of fair value measurement of assets [line items] | |||||||||||||||||||||||||
| Assets | — | — | — | — | — | — | — | — |
4,251,400,000
GBP
|
3,902,100,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Reconciliation of changes in fair value measurement, assets [abstract] | |||||||||||||||||||||||||
| Disclosure of fair value measurement of equity [text block] | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Disclosure of fair value measurement of equity [abstract] | |||||||||||||||||||||||||
| Disclosure of fair value measurement of equity [line items] | |||||||||||||||||||||||||
| Equity |
36,300,000
GBP
|
41,200,000
GBP
|
45,700,000
GBP
|
156 .8
GBP
|
25,300,000
GBP
|
10,600,000
GBP
|
— |
3,548,300,000
GBP
|
3,7 31.2
GBP
|
3,573,300,000
GBP
|
32,200,000
GBP
|
10,300,000
GBP
|
36,300,000
GBP
|
45,700,000
GBP
|
156 . 8
GBP
|
36. 7
GBP
|
3,393,100,000
GBP
|
3,721,700,000
GBP
|
9,400,000
GBP
|
4 5.7
GBP
|
36,300,000
GBP
|
29,100,000
GBP
|
46,300,000
GBP
|
156 .8
GBP
|
3,548,900,000
GBP
|
| Reconciliation of changes in fair value measurement, entity's own equity instruments [abstract] |