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 | — | — | — | — | — | — | — | — | — |
3,161,500,000
GBP
|
3,173,000,000
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 | — | — | — | — | — | — | — | — | — |
2,408,600,000
GBP
|
2,249,900,000
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 |
9,300,000
GBP
|
1,707,200,000
GBP
|
2,192,600,000
GBP
|
93,600,000
GBP
|
12,700,000
GBP
|
3,300,000
GBP
|
1,900,000
GBP
|
6,600,000
GBP
|
143,900,000
GBP
|
752,900,000
GBP
|
923,100,000
GBP
|
1,437,700,000
GBP
|
9,300,000
GBP
|
20,800,000
GBP
|
2,094,500,000
GBP
|
82,400,000
GBP
|
2,500,000
GBP
|
143,900,000
GBP
|
800,000
GBP
|
6,600,000
GBP
|
723,500,000
GBP
|
19,500,000
GBP
|
1,697,400,000
GBP
|
9,300,000
GBP
|
1,233,900,000
GBP
|
69,900,000
GBP
|
6,500,000
GBP
|
143,900,000
GBP
|
4,300,000
GBP
|
6,600,000
GBP
|
| Reconciliation of changes in fair value measurement, entity's own equity instruments [abstract] |