Disclosure Of Fair Value Measurement [Text Block]
| Concept |
As at 2023-12-31 |
As at 2023-12-31 |
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As at 2022-12-31 |
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As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-01-01 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
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| Disclosure of fair value measurement [text block] | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 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 |
3,173,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
3,104,300,000
GBP
|
— | — | — | — | — | — | — | — | — |
2,842,500,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Reconciliation of changes in fair value measurement, assets [abstract] | |||||||||||||||||||||||||||||||
| Disclosure of fair value measurement of liabilities [text block] | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Disclosure of fair value measurement of liabilities [abstract] | |||||||||||||||||||||||||||||||
| Disclosure of fair value measurement of liabilities [line items] | |||||||||||||||||||||||||||||||
| Liabilities |
2,249,900,000
GBP
|
— | — | — | — | — | — | — | — | — |
2,380,800,000
GBP
|
— | — | — | — | — | — | — | — | — |
2,231,100,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Reconciliation of changes in fair value measurement, liabilities [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 |
923,100,000
GBP
|
1,437,700,000
GBP
|
9,300,000
GBP
|
20,800,000
GBP
|
2,094,500,000
GBP
|
82,400,000
GBP
|
2,500,000
GBP
|
143,900,000
GBP
|
800,000
GBP
|
6,600,000
GBP
|
723,500,000
GBP
|
19,500,000
GBP
|
1,697,400,000
GBP
|
9,300,000
GBP
|
1,233,900,000
GBP
|
69,900,000
GBP
|
6,500,000
GBP
|
143,900,000
GBP
|
4,300,000
GBP
|
6,600,000
GBP
|
611,400,000
GBP
|
6,600,000
GBP
|
711,400,000
GBP
|
9,300,000
GBP
|
611,400,000
GBP
|
6,700,000
GBP
|
143,900,000
GBP
|
18,600,000
GBP
|
1,123,400,000
GBP
|
2,700,000
GBP
|
11,600,000
GBP
|
| Reconciliation of changes in fair value measurement, entity's own equity instruments [abstract] |