Disclosure Of Fair Value Measurement [Text Block]
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As at 2022-03-31 |
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As at 2021-03-31 |
As at 2021-03-31 |
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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 | — | — | — |
3,309,900,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
4,600,700,000
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 | — | — | — |
2,939,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
3,899,200,000
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 |
353,900,000
GBP
|
3,000,000
GBP
|
768,800,000
GBP
|
370,900,000
GBP
|
873,000,000
GBP
|
303,400,000
GBP
|
30,600,000
GBP
|
17,000,000
GBP
|
1,568,800,000
GBP
|
56,100,000
GBP
|
30,600,000
GBP
|
682,000,000
GBP
|
768,800,000
GBP
|
4,000,000
GBP
|
303,400,000
GBP
|
56,400,000
GBP
|
873,000,000
GBP
|
1,241,400,000
GBP
|
701,500,000
GBP
|
19,500,000
GBP
|
30,600,000
GBP
|
1,671,700,000
GBP
|
229,000,000
GBP
|
303,400,000
GBP
|
873,000,000
GBP
|
16,000,000
GBP
|
213,000,000
GBP
|
48,400,000
GBP
|
768,800,000
GBP
|
42,700,000
GBP
|
| Reconciliation of changes in fair value measurement, entity's own equity instruments [abstract] |