Disclosure Of Fair Value Measurement [Text Block]
| Concept |
As at 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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| Disclosure of fair value measurement [text block] | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 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 |
923,000,000
GBP
|
174,000,000
GBP
|
394,000,000
GBP
|
24,000,000
GBP
|
1,808,000,000
GBP
|
1,832,000,000
GBP
|
7,000,000
GBP
|
79,000,000
GBP
|
245,000,000
GBP
|
211,000,000
GBP
|
2,000,000
GBP
|
78,000,000
GBP
|
1,828,000,000
GBP
|
919,000,000
GBP
|
42,000,000
GBP
|
174,000,000
GBP
|
406,000,000
GBP
|
1,786,000,000
GBP
|
1,876,000,000
GBP
|
54,000,000
GBP
|
174,000,000
GBP
|
928,000,000
GBP
|
403,000,000
GBP
|
1,822,000,000
GBP
|
107,000,000
GBP
|
211,000,000
GBP
|
1,000,000
GBP
|
| Reconciliation of changes in fair value measurement, entity's own equity instruments [abstract] |