Disclosure Of Fair Value Measurement [Text Block]
| Concept |
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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 | — | — | — | — | — |
24,531,900,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
22,654,500,000
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 | — | — | — | — | — |
22,507 .5
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
20,977,600,000
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 .5
GBP
|
–
GBP
|
3,215. 1
GBP
|
150,000,000
GBP
|
1 ,355 .3
GBP
|
2,024,400,000
GBP
|
600,000
GBP
|
700,000
GBP
|
1 3.4
GBP
|
1 .1
GBP
|
4,500,000
GBP
|
–
GBP
|
1,355,300,000
GBP
|
1,608,600,000
GBP
|
60,000,000
GBP
|
1,359 .8
GBP
|
4,000,000
GBP
|
1,000,000
GBP
|
–
GBP
|
7. 8
GBP
|
1,6 7 6. 9
GBP
|
–
GBP
|
1,000,000
GBP
|
–
GBP
|
60,000,000
GBP
|
12,800,000
GBP
|
–
GBP
|
1,000,000
GBP
|
6,500,000
GBP
|
8 64.2
GBP
|
1 , 4 7 7. 0
GBP
|
553. 2
GBP
|
500,000
GBP
|
5,600,000
GBP
|
3,700,000
GBP
|
4,500,000
GBP
|
| Reconciliation of changes in fair value measurement, entity's own equity instruments [abstract] |