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 | — | — | — | — | — | — | — |
36,516,000,000
GBP
|
— | — |
31,953,000,000
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 | — | — | — | — | — | — | — |
27,002,000,000
GBP
|
— | — |
23,522,000,000
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 |
3,550,000,000
GBP
|
1,351,000,000
GBP
|
1,716,000,000
GBP
|
3,220,000,000
GBP
|
7,798,000,000
GBP
|
1,046,000,000
GBP
|
5,388,000,000
GBP
|
9,514,000,000
GBP
|
1,838,000,000
GBP
|
723,000,000
GBP
|
8,431,000,000
GBP
|
8,682,000,000
GBP
|
3,202,000,000
GBP
|
1,351,000,000
GBP
|
741,000,000
GBP
|
1,534,000,000
GBP
|
3,184,000,000
GBP
|
1,877,000,000
GBP
|
1,581,000,000
GBP
|
3,435,000,000
GBP
|
5,312,000,000
GBP
|
741,000,000
GBP
|
251,000,000
GBP
|
3,202,000,000
GBP
|
6,897,000,000
GBP
|
1,351,000,000
GBP
|
7,148,000,000
GBP
|
1,581,000,000
GBP
|
5,061,000,000
GBP
|
1,877,000,000
GBP
|
1,534,000,000
GBP
|
251,000,000
GBP
|
251,000,000
GBP
|
251,000,000
GBP
|
2,407,000,000
GBP
|
1,351,000,000
GBP
|
1,668,000,000
GBP
|
6,772,000,000
GBP
|
1,936,000,000
GBP
|
742,000,000
GBP
|
4,343,000,000
GBP
|
8,440,000,000
GBP
|
929,000,000
GBP
|
3,201,000,000
GBP
|
1,795,000,000
GBP
|
2,026,000,000
GBP
|
10,156,000,000
GBP
|
3,190,000,000
GBP
|
8,361,000,000
GBP
|
5,912,000,000
GBP
|
818,000,000
GBP
|
753,000,000
GBP
|
3,886,000,000
GBP
|
1,350,000,000
GBP
|
| Reconciliation of changes in fair value measurement, entity's own equity instruments [abstract] |