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 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
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As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
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As at 2019-12-31 |
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 | — | — | — | — |
2 1 9 ,1 3 4
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
2 28 ,7 2 6
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 | — | — | — | — |
2 13 ,78 9
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
2 2 3 ,1 41
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 |
1,000,000
GBP
|
16, 550
GBP
|
93,000,000
GBP
|
1 1 , 6 6 0
GBP
|
5,345,000,000
GBP
|
5,296,000,000
GBP
|
370,000,000
GBP
|
49,000,000
GBP
|
130,000,000
GBP
|
16 ,85 3
GBP
|
1 1 7
GBP
|
8,000,000
GBP
|
5, 57 7
GBP
|
130,000,000
GBP
|
1,000,000
GBP
|
1 1 , 6 5 8
GBP
|
3 70
GBP
|
5,585,000,000
GBP
|
5 ,1 2 5
GBP
|
11 , 6 9 0
GBP
|
6,000,000
GBP
|
5 ,1 3 1
GBP
|
3 70
GBP
|
16, 3 42
GBP
|
1,000,000
GBP
|
2 6
GBP
|
130,000,000
GBP
|
| Reconciliation of changes in fair value measurement, entity's own equity instruments [abstract] |