Disclosure Of Fair Value Measurement [Text Block]
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As at 2021-12-31 |
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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 |
415,468,000,000
GBP
|
— | — | — | — | — | — | — | — |
409,469,000,000
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 |
394,038,000,000
GBP
|
— | — | — | — | — | — | — | — |
389,393,000,000
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 |
21,430,000,000
GBP
|
14,871,000,000
GBP
|
35,000,000
GBP
|
28,000,000
GBP
|
21,395,000,000
GBP
|
600,000,000
GBP
|
41,000,000
GBP
|
2,518,000,000
GBP
|
104,000,000
GBP
|
20,076,000,000
GBP
|
10,000,000
GBP
|
2,225,000,000
GBP
|
820,000,000
GBP
|
13,302,000,000
GBP
|
1,678,000,000
GBP
|
20,066,000,000
GBP
|
77,000,000
GBP
|
76,000,000
GBP
|
2,518,000,000
GBP
|
391,000,000
GBP
|
87,000,000
GBP
|
13,507,000,000
GBP
|
820,000,000
GBP
|
2,377,000,000
GBP
|
1,000,000
GBP
|
192,000,000
GBP
|
14,000,000
GBP
|
85,000,000
GBP
|
2,225,000,000
GBP
|
10,000,000
GBP
|
1,678,000,000
GBP
|
| Reconciliation of changes in fair value measurement, entity's own equity instruments [abstract] |