Disclosure Of Fair Value Measurement [Text Block]
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| Disclosure of fair value measurement [text block] | — | — | — | — | — | — | — |
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| 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 | — | — | — | — | — | — |
29,491,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
30,958,000,000
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 | — | — | — | — | — | — |
22,849,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
23,485,000,000
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 |
5,843,000,000
GBP
|
755,000,000
GBP
|
674,000,000
GBP
|
621,000,000
GBP
|
6,021,000,000
GBP
|
97,000,000
GBP
|
6,642,000,000
GBP
|
— |
103,000,000
GBP
|
443,000,000
GBP
|
1,363,000,000
GBP
|
6,860,000,000
GBP
|
5,837,000,000
GBP
|
7,473,000,000
GBP
|
613,000,000
GBP
|
5,837,000,000
GBP
|
7,473,000,000
GBP
|
6,860,000,000
GBP
|
443,000,000
GBP
|
613,000,000
GBP
|
103,000,000
GBP
|
1,363,000,000
GBP
|
103,000,000
GBP
|
766,000,000
GBP
|
200,000,000
GBP
|
5,962,000,000
GBP
|
588,000,000
GBP
|
5,374,000,000
GBP
|
22,000,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
22,000,000
GBP
|
–
GBP
|
22,000,000
GBP
|
5,837,000,000
GBP
|
200,000,000
GBP
|
588,000,000
GBP
|
5,352,000,000
GBP
|
788,000,000
GBP
|
5,940,000,000
GBP
|
5,837,000,000
GBP
|
103,000,000
GBP
|
| Reconciliation of changes in fair value measurement, entity's own equity instruments [abstract] |