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 | — | — | — | — | — |
1 1,90 0
GBP
|
— | — |
12,103,000,000
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 | — | — | — | — | — |
5,296,000,000
GBP
|
— | — |
5,44 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 |
290,000,000
GBP
|
82,000,000
GBP
|
31,000,000
GBP
|
2,228,000,000
GBP
|
294,000,000
GBP
|
6,604,000,000
GBP
|
3,7 41
GBP
|
71,000,000
GBP
|
6,663,000,000
GBP
|
285,000,000
GBP
|
22,000,000
GBP
|
30 5
GBP
|
2,228,000,000
GBP
|
3,7 96
GBP
|
50,000,000
GBP
|
325,000,000
GBP
|
2,228,000,000
GBP
|
4, 025
GBP
|
46,000,000
GBP
|
6,778,000,000
GBP
|
196,000,000
GBP
|
| Reconciliation of changes in fair value measurement, entity's own equity instruments [abstract] |