Disclosure Of Fair Value Measurement [Text Block]
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As at 2022-09-30 |
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As at 2021-10-01 |
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As at 2020-10-01 |
As at 2020-10-01 |
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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 | — | — | — |
16,653,600,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
15,137,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
15,505,500,000
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 | — | — | — |
15,236,300,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
13,895,100,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
14,349,500,000
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 |
-
GBP
|
70,200,000
GBP
|
71,100,000
GBP
|
1,417,300,000
GBP
|
1,151,200,000
GBP
|
48,000,000
GBP
|
241,400,000
GBP
|
71,800,000
GBP
|
262,500,000
GBP
|
1,005,900,000
GBP
|
76,700,000
GBP
|
1,241,900,000
GBP
|
70,200,000
GBP
|
50,300,000
GBP
|
-
GBP
|
70,100,000
GBP
|
-
GBP
|
70,200,000
GBP
|
76,700,000
GBP
|
50,300,000
GBP
|
1,005,900,000
GBP
|
1,241,900,000
GBP
|
262,500,000
GBP
|
70,100,000
GBP
|
1,156,000,000
GBP
|
2,500,000
GBP
|
50,300,000
GBP
|
70,200,000
GBP
|
880,700,000
GBP
|
68,700,000
GBP
|
261,800,000
GBP
|
37,800,000
GBP
|
1,156,000,000
GBP
|
| Reconciliation of changes in fair value measurement, entity's own equity instruments [abstract] |