Disclosure Of Fair Value Measurement [Text Block]
| Concept |
2022-04-01 to 2023-03-31 |
As at 2023-03-31 |
As at 2023-03-31 |
As at 2023-03-31 |
As at 2023-03-31 |
As at 2023-03-31 |
As at 2023-03-31 |
As at 2023-03-31 |
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 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 2021-03-31 |
As at 2021-03-31 |
As at 2004-04-01 |
As at 2004-04-01 |
As at 2004-04-01 |
As at 2004-04-01 |
As at 2003-04-01 |
As at 2001-04-01 |
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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 | — | — |
9,840,776,000
GBP
|
— | — | — | — | — | — | — | — | — |
9,559,176,000
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 | — | — |
6,782,466,000
GBP
|
— | — | — | — | — | — | — | — | — |
6,588,613,000
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 | — |
2,978,091,000
GBP
|
3,058,310,000
GBP
|
883,669,000
GBP
|
17,422,000
GBP
|
80,219,000
GBP
|
1,941,223,000
GBP
|
135,777,000
GBP
|
2,905,184,000
GBP
|
17,422,000
GBP
|
883,321,000
GBP
|
1,783,033,000
GBP
|
2,970,563,000
GBP
|
65,379,000
GBP
|
221,408,000
GBP
|
1,631,797,000
GBP
|
115,291,000
GBP
|
2,705,644,000
GBP
|
17,422,000
GBP
|
882,924,000
GBP
|
58,210,000
GBP
|
2,647,434,000
GBP
|
221,408,000
GBP
|
65,379,000
GBP
|
2,905,184,000
GBP
|
883,321,000
GBP
|
1,783,033,000
GBP
|
17,422,000
GBP
|
| Reconciliation of changes in fair value measurement, entity's own equity instruments [abstract] |