Disclosure Of Fair Value Measurement [Text Block]
| Concept |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
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As at 2021-12-31 |
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As at 2020-12-31 |
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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 2019-12-31 |
As at 2019-12-31 |
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As at 2019-12-31 |
As at 2019-12-31 |
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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 | — | — | — |
3,843,249,000
GBP
|
— | — | — | — | — | — | — | — | — |
3,632,194,000
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 | — | — | — |
1,452,668,000
GBP
|
— | — | — | — | — | — | — | — | — |
1,437,112,000
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 |
3,372,000
GBP
|
1,094,833,000
GBP
|
1,098,205,000
GBP
|
2,390,581,000
GBP
|
823,513,000
GBP
|
361,081,000
GBP
|
111,154,000
GBP
|
899,785,000
GBP
|
111,127,000
GBP
|
823,513,000
GBP
|
6,956,000
GBP
|
906,7 41
GBP
|
360,657,000
GBP
|
2,195,082,000
GBP
|
841,560,000
GBP
|
359,857,000
GBP
|
1,271,966,000
GBP
|
837,940,000
GBP
|
3,620,000
GBP
|
7 4,169
GBP
|
| Reconciliation of changes in fair value measurement, entity's own equity instruments [abstract] |