Disclosure Of Fair Value Measurement [Text Block]
| Concept |
As at 2021-12-31 |
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As at 2020-12-31 |
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As at 2019-12-31 |
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As at 2018-12-31 |
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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 | — | — |
287,098,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
292,332,000,000
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 | — | — |
270,996,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
276,396,000,000
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 |
5,053,000,000
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
|
4,348,000,000
GBP
|
162,000,000
GBP
|
481,000,000
GBP
|
15,774,000,000
GBP
|
3,105,000,000
GBP
|
2,191,000,000
GBP
|
1,000,000
GBP
|
5,620,000,000
GBP
|
15,936,000,000
GBP
|
28,000,000
GBP
|
15,857,000,000
GBP
|
2,191,000,000
GBP
|
160,000,000
GBP
|
1,000,000
GBP
|
5,620,000,000
GBP
|
16,017,000,000
GBP
|
4,546,000,000
GBP
|
23,000,000
GBP
|
371,000,000
GBP
|
3,105,000,000
GBP
|
5,000,000
GBP
|
5,620,000,000
GBP
|
15,758,000,000
GBP
|
151,000,000
GBP
|
15,909,000,000
GBP
|
1,991,000,000
GBP
|
23,000,000
GBP
|
256,000,000
GBP
|
3,119,000,000
GBP
|
4,744,000,000
GBP
|
| Reconciliation of changes in fair value measurement, entity's own equity instruments [abstract] |