Disclosure Of Fair Value Measurement [Text Block]
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As at 2022-07-31 |
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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 | — | — | — | — |
4,999,700,000
GBP
|
— | — |
5,114,100,000
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 | — | — | — | — |
1,534,300,000
GBP
|
— | — |
1,652,500,000
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 |
183,200,000
GBP
|
20,600,000
GBP
|
14,800,000
GBP
|
3,245,300,000
GBP
|
3,465,400,000
GBP
|
1,500,000
GBP
|
182,000,000
GBP
|
3,461,600,000
GBP
|
15,000,000
GBP
|
3,242,700,000
GBP
|
20,400,000
GBP
|
1,500,000
GBP
|
182,000,000
GBP
|
15,400,000
GBP
|
3,148,900,000
GBP
|
3,367,800,000
GBP
|
20,000,000
GBP
|
1,500,000
GBP
|
| Reconciliation of changes in fair value measurement, entity's own equity instruments [abstract] |