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, 447
GBP
|
6 ,206
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 | — | — | — | — | — | — | — | — | — |
4,369,000,000
GBP
|
4, 141
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, 910
GBP
|
199,000,000
GBP
|
18,000,000
GBP
|
77,000,000
GBP
|
4,000,000
GBP
|
2, 060
GBP
|
52,000,000
GBP
|
9 46
GBP
|
22,000,000
GBP
|
2,0 78
GBP
|
2, 065
GBP
|
2,8 14
GBP
|
3,000,000
GBP
|
17,000,000
GBP
|
197,000,000
GBP
|
29,000,000
GBP
|
2 ,0 4 8
GBP
|
9 46
GBP
|
29,000,000
GBP
|
20,000,000
GBP
|
2, 161
GBP
|
5,000,000
GBP
|
18,000,000
GBP
|
2,800,000,000
GBP
|
–
GBP
|
197,000,000
GBP
|
2, 143
GBP
|
946,000,000
GBP
|
109,000,000
GBP
|
22,000,000
GBP
|
| Reconciliation of changes in fair value measurement, entity's own equity instruments [abstract] |