Disclosure Of Fair Value Measurement [Text Block]
| Concept |
As at 2021-12-31 |
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As at 2020-12-31 |
As at 2020-12-31 |
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As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
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As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
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As at 2019-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 | — | — | — |
2,842,500,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
2,794,800,000
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 | — | — | — |
2,182,100,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
1,990,700,000
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 |
6,600,000
GBP
|
662,400,000
GBP
|
9,300,000
GBP
|
660,400,000
GBP
|
6,700,000
GBP
|
143,900,000
GBP
|
1,123,400,000
GBP
|
18,600,000
GBP
|
2,700,000
GBP
|
11,600,000
GBP
|
503,100,000
GBP
|
16,300,000
GBP
|
10,900,000
GBP
|
11,500,000
GBP
|
144,000,000
GBP
|
400,000
GBP
|
1,108,200,000
GBP
|
804,100,000
GBP
|
6,600,000
GBP
|
9,300,000
GBP
|
14,100,000
GBP
|
400,000
GBP
|
6,600,000
GBP
|
352,300,000
GBP
|
–
GBP
|
329,600,000
GBP
|
4 2.8
GBP
|
–
GBP
|
2,300,000
GBP
|
2,100,000
GBP
|
| Reconciliation of changes in fair value measurement, entity's own equity instruments [abstract] |