Disclosure Of Fair Value Measurement [Text Block]
| Concept |
As at 2021-12-31 |
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As at 2020-12-31 |
As at 2020-12-31 |
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As at 2019-12-31 |
As at 2019-12-31 |
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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 | — | — | — |
434,563,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
389,539,000,000
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 | — | — | — |
413,826,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
369,647,000,000
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 |
13,507,000,000
GBP
|
820,000,000
GBP
|
2,377,000,000
GBP
|
20,737,000,000
GBP
|
1,000,000
GBP
|
192,000,000
GBP
|
85,000,000
GBP
|
14,000,000
GBP
|
20,727,000,000
GBP
|
10,000,000
GBP
|
12,720,000,000
GBP
|
10,000,000
GBP
|
133,000,000
GBP
|
2,370,000,000
GBP
|
19,882,000,000
GBP
|
1,678,000,000
GBP
|
63,000,000
GBP
|
9,000,000
GBP
|
2,225,000,000
GBP
|
19,892,000,000
GBP
|
280,000,000
GBP
|
796,000,000
GBP
|
6,000,000
GBP
|
2,370,000,000
GBP
|
167,000,000
GBP
|
2,225,000,000
GBP
|
12,223,000,000
GBP
|
250,000,000
GBP
|
796,000,000
GBP
|
27,000,000
GBP
|
70,000,000
GBP
|
1,678,000,000
GBP
|
| Reconciliation of changes in fair value measurement, entity's own equity instruments [abstract] |