Disclosure Of Fair Value Measurement [Text Block]
| Concept |
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As at 2020-12-31 |
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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 | — | — | — |
4,913,900,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
5,90 6.3
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 | — | — | — |
2,167,900,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
2,697,400,000
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 |
3,500,000
GBP
|
243,500,000
GBP
|
207,600,000
GBP
|
2,746,000,000
GBP
|
1,700,000
GBP
|
362,800,000
GBP
|
374,100,000
GBP
|
2,745,900,000
GBP
|
1,593,200,000
GBP
|
100,000
GBP
|
471,100,000
GBP
|
221,000,000
GBP
|
663,000,000
GBP
|
100,000
GBP
|
3,400,000
GBP
|
3,208,800,000
GBP
|
202,900,000
GBP
|
374,100,000
GBP
|
400,000
GBP
|
666,000,000
GBP
|
207,100,000
GBP
|
1,611 .9
GBP
|
3,208,900,000
GBP
|
519,200,000
GBP
|
4,377 .0
GBP
|
200,000
GBP
|
25,600,000
GBP
|
5 20.9
GBP
|
4,377,200,000
GBP
|
1,266,000,000
GBP
|
374,100,000
GBP
|
2,433,200,000
GBP
|
2,200,000
GBP
|
1,400,000
GBP
|
191,600,000
GBP
|
430,800,000
GBP
|
| Reconciliation of changes in fair value measurement, entity's own equity instruments [abstract] |