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 |
702,970,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
716,646,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
596,027,000,000
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 |
678,465,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
693,413,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
572,882,000,000
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 |
24,505,000,000
GBP
|
616,000,000
GBP
|
24,724,000,000
GBP
|
146,000,000
GBP
|
2,178,000,000
GBP
|
1,801,000,000
GBP
|
24,359,000,000
GBP
|
330,000,000
GBP
|
868,000,000
GBP
|
7,692,000,000
GBP
|
3,930,000,000
GBP
|
23,233,000,000
GBP
|
894,000,000
GBP
|
7,692,000,000
GBP
|
1,217,000,000
GBP
|
131,000,000
GBP
|
24,368,000,000
GBP
|
1,613,000,000
GBP
|
23,102,000,000
GBP
|
3,930,000,000
GBP
|
278,000,000
GBP
|
950,000,000
GBP
|
522,000,000
GBP
|
24,157,000,000
GBP
|
7,000,000
GBP
|
3,722,000,000
GBP
|
23,715,000,000
GBP
|
578,000,000
GBP
|
23,145,000,000
GBP
|
570,000,000
GBP
|
570,000,000
GBP
|
7,000,000
GBP
|
514,000,000
GBP
|
7,692,000,000
GBP
|
797,000,000
GBP
|
3,722,000,000
GBP
|
24,735,000,000
GBP
|
1,603,000,000
GBP
|
23,584,000,000
GBP
|
948,000,000
GBP
|
7,692,000,000
GBP
|
131,000,000
GBP
|
514,000,000
GBP
|
797,000,000
GBP
|
1,081,000,000
GBP
|
—
GBP
|
23,014,000,000
GBP
|
131,000,000
GBP
|
948,000,000
GBP
|
23,829,000,000
GBP
|
183,000,000
GBP
|
158,000,000
GBP
|
23,666,000,000
GBP
|
3,722,000,000
GBP
|
1,543,000,000
GBP
|
23,849,000,000
GBP
|
1,309,000,000
GBP
|
7,692,000,000
GBP
|
797,000,000
GBP
|
| Reconciliation of changes in fair value measurement, entity's own equity instruments [abstract] |