Disclosure Of Fair Value Measurement [Text Block]
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As at 2020-12-31 |
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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 7,1 3 5
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
2 7, 5 3 0
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 | — | — |
19,4 67
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
22 ,609
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 |
212,000,000
GBP
|
5, 887
GBP
|
7, 6 6 8
GBP
|
7, 4 3 6
GBP
|
1,252,000,000
GBP
|
232,000,000
GBP
|
85,000,000
GBP
|
87,000,000
GBP
|
4 , 921
GBP
|
2,6 1 6
GBP
|
5,923,000,000
GBP
|
1, 2 4 9
GBP
|
4, 643
GBP
|
278,000,000
GBP
|
2,6 1 6
GBP
|
278,000,000
GBP
|
4, 643
GBP
|
87,000,000
GBP
|
5,923,000,000
GBP
|
1, 2 4 9
GBP
|
4 , 921
GBP
|
87,000,000
GBP
|
6 ,1 5 6
GBP
|
2,0 8 5
GBP
|
5,5 1 1
GBP
|
10 4
GBP
|
1, 2 4 9
GBP
|
5, 4 07
GBP
|
| Reconciliation of changes in fair value measurement, entity's own equity instruments [abstract] |