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 |
8,666,800,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
7,114,100,000
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 |
5,945,900,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
4,910,200,000
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 |
2,720,900,000
GBP
|
199,400,000
GBP
|
16,100,000
GBP
|
2,532,900,000
GBP
|
108,500,000
GBP
|
74,200,000
GBP
|
2,500,000
GBP
|
63,400,000
GBP
|
900,000
GBP
|
400,000
GBP
|
269,200,000
GBP
|
2,217,000,000
GBP
|
194,200,000
GBP
|
108,400,000
GBP
|
2,216,500,000
GBP
|
2,500,000
GBP
|
16,100,000
GBP
|
52,900,000
GBP
|
2,204,400,000
GBP
|
16,100,000
GBP
|
2,500,000
GBP
|
400,000
GBP
|
2,203,900,000
GBP
|
2,203,900,000
GBP
|
400,000
GBP
|
16,100,000
GBP
|
194,200,000
GBP
|
52,900,000
GBP
|
2,204,400,000
GBP
|
12,600,000
GBP
|
108,400,000
GBP
|
12,600,000
GBP
|
52,900,000
GBP
|
269,200,000
GBP
|
2,500,000
GBP
|
194,200,000
GBP
|
269,200,000
GBP
|
108,400,000
GBP
|
1,873,100,000
GBP
|
4,300,000
GBP
|
108,300,000
GBP
|
2,500,000
GBP
|
187,700,000
GBP
|
190,900,000
GBP
|
73,400,000
GBP
|
1,919,100,000
GBP
|
16,100,000
GBP
|
| Reconciliation of changes in fair value measurement, entity's own equity instruments [abstract] |