Disclosure Of Fair Value Measurement [Text Block]
| Concept |
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As at 2020-12-31 |
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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 | — | — | — |
358,474,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
479,857,000,000
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 | — | — | — |
339,020,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
459,297,000,000
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 |
51,000,000
GBP
|
7,556,000,000
GBP
|
66,000,000
GBP
|
19,454,000,000
GBP
|
941,000,000
GBP
|
200,000,000
GBP
|
10,308,000,000
GBP
|
—
GBP
|
19,202,000,000
GBP
|
252,000,000
GBP
|
314,000,000
GBP
|
7,468,000,000
GBP
|
1,006,000,000
GBP
|
19,554,000,000
GBP
|
6,000,000
GBP
|
862,000,000
GBP
|
212,000,000
GBP
|
10,260,000,000
GBP
|
20,560,000,000
GBP
|
200,000,000
GBP
|
—
GBP
|
982,000,000
GBP
|
17,708,000,000
GBP
|
977,000,000
GBP
|
980,000,000
GBP
|
101,000,000
GBP
|
814,000,000
GBP
|
10,257,000,000
GBP
|
200,000,000
GBP
|
18,685,000,000
GBP
|
5,065,000,000
GBP
|
7,000,000
GBP
|
500,000,000
GBP
|
| Reconciliation of changes in fair value measurement, entity's own equity instruments [abstract] |