Disclosure Of Fair Value Measurement [Text Block]
| Concept |
As at 2022-03-31 |
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As at 2021-03-31 |
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As at 2020-03-31 |
As at 2020-03-31 |
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As at 2020-03-31 |
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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 | — | — | — | — | — | — | — | — | — |
7 207
GBP
|
— | — | — |
6 672
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 | — | — | — | — | — | — | — | — | — |
3 961
GBP
|
— | — | — |
3 705
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 |
6,000,000
GBP
|
3 014
GBP
|
4,000,000
GBP
|
3 107
GBP
|
2,000,000
GBP
|
74,000,000
GBP
|
752,000,000
GBP
|
690,000,000
GBP
|
4 597
GBP
|
3 246
GBP
|
139,000,000
GBP
|
6,000,000
GBP
|
4 523
GBP
|
2 967
GBP
|
74,000,000
GBP
|
690,000,000
GBP
|
–
GBP
|
8,000,000
GBP
|
118,000,000
GBP
|
3 014
GBP
|
2 849
GBP
|
578,000,000
GBP
|
113,000,000
GBP
|
2 890
GBP
|
–
GBP
|
3 014
GBP
|
3 003
GBP
|
815,000,000
GBP
|
6,000,000
GBP
|
690,000,000
GBP
|
8,000,000
GBP
|
74,000,000
GBP
|
4 327
GBP
|
| Reconciliation of changes in fair value measurement, entity's own equity instruments [abstract] |