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 | — | — | — | — | — | — | — | — | — |
259,944,000,000
GBP
|
275,448,000,000
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 | — | — | — | — | — | — | — | — | — |
246,171,000,000
GBP
|
260,825,000,000
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 |
3,521,000,000
GBP
|
5,620,000,000
GBP
|
3,105,000,000
GBP
|
—
GBP
|
1,000,000
GBP
|
13,773,000,000
GBP
|
317,000,000
GBP
|
1,860,000,000
GBP
|
17,000,000
GBP
|
13,773,000,000
GBP
|
14,623,000,000
GBP
|
4,295,000,000
GBP
|
—
GBP
|
5,620,000,000
GBP
|
3,105,000,000
GBP
|
1,000,000
GBP
|
14,623,000,000
GBP
|
348,000,000
GBP
|
6,000,000
GBP
|
1,956,000,000
GBP
|
14,407,000,000
GBP
|
—
GBP
|
5,620,000,000
GBP
|
4,848,000,000
GBP
|
3,105,000,000
GBP
|
1,000,000
GBP
|
14,407,000,000
GBP
|
1,956,000,000
GBP
|
5,000,000
GBP
|
1,128,000,000
GBP
|
5,053,000,000
GBP
|
2,191,000,000
GBP
|
16,102,000,000
GBP
|
107,000,000
GBP
|
25,000,000
GBP
|
16,102,000,000
GBP
|
5,620,000,000
GBP
|
—
GBP
|
1,000,000
GBP
|
3,105,000,000
GBP
|
| Reconciliation of changes in fair value measurement, entity's own equity instruments [abstract] |