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 |
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 |
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As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 | — | — | — |
9,308,600,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
9,622,300,000
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 | — | — | — |
6,411,900,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
6,576,100,000
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 |
41,400,000
GBP
|
1,454,800,000
GBP
|
982,900,000
GBP
|
2,896,700,000
GBP
|
346,500,000
GBP
|
9,000,000
GBP
|
2,550,200,000
GBP
|
300,000
GBP
|
145,200,000
GBP
|
1,056,100,000
GBP
|
2,699,700,000
GBP
|
148,900,000
GBP
|
83,900,000
GBP
|
346,500,000
GBP
|
40,300,000
GBP
|
—
GBP
|
3,046,200,000
GBP
|
1,451,100,000
GBP
|
2,643,600,000
GBP
|
346,500,000
GBP
|
47,500,000
GBP
|
100,000
GBP
|
1,450,000,000
GBP
|
2,990,100,000
GBP
|
1,026,200,000
GBP
|
30,200,000
GBP
|
150,000,000
GBP
|
| Reconciliation of changes in fair value measurement, entity's own equity instruments [abstract] |