Disclosure Of Fair Value Measurement [Text Block]
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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 |
6,085,400,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
6,015,700,000
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 |
2,7 66.9
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
2,7 66.0
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 |
3,318,500,000
GBP
|
1,18 4.8
GBP
|
1,500,000
GBP
|
1,199,500,000
GBP
|
361,000,000
GBP
|
173,400,000
GBP
|
14,700,000
GBP
|
1,597,800,000
GBP
|
1,300,000
GBP
|
1,116,200,000
GBP
|
17,400,000
GBP
|
1,133,600,000
GBP
|
1,597,800,000
GBP
|
17 3.6
GBP
|
360,800,000
GBP
|
3,249,700,000
GBP
|
3,24 9.7
GBP
|
1,133,600,000
GBP
|
360,800,000
GBP
|
1,300,000
GBP
|
1,116,200,000
GBP
|
17,400,000
GBP
|
173,600,000
GBP
|
1,597,800,000
GBP
|
1,094,800,000
GBP
|
361,100,000
GBP
|
111,200,000
GBP
|
2,390,600,000
GBP
|
3,400,000
GBP
|
1,098,200,000
GBP
|
823,500,000
GBP
|
-
GBP
|
| Reconciliation of changes in fair value measurement, entity's own equity instruments [abstract] |