Disclosure Of Fair Value Measurement [Text Block]
| Concept |
As at 2022-03-31 |
As at 2022-03-31 |
As at 2022-03-31 |
As at 2022-03-31 |
As at 2022-03-31 |
As at 2021-03-31 |
As at 2021-03-31 |
As at 2021-03-31 |
As at 2021-03-31 |
As at 2021-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 | — | — | — |
14,437,000,000
GBP
|
— | — | — |
14,179,100,000
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 | — | — | — |
11,479,600,000
GBP
|
— | — | — |
11,148,100,000
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 |
499,800,000
GBP
|
2,900,000
GBP
|
2,038,500,000
GBP
|
2,957,400,000
GBP
|
416,200,000
GBP
|
2,192,000,000
GBP
|
336,300,000
GBP
|
3,031,000,000
GBP
|
499,800,000
GBP
|
2,900,000
GBP
|
336,700,000
GBP
|
2,962,100,000
GBP
|
2,900,000
GBP
|
499,800,000
GBP
|
2,122,700,000
GBP
|
| Reconciliation of changes in fair value measurement, entity's own equity instruments [abstract] |