Disclosure Of Fair Value Measurement [Text Block]
| Concept |
As at 2023-03-31 |
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2022-04-01 to 2023-03-31 |
As at 2022-03-31 |
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As at 2021-03-31 |
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| Disclosure of fair value measurement [text block] | — | — | — | — | — | — | — | — | — |
|
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| 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 | — | — |
8,290,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
9,910,000,000
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 | — | — |
2,765,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
3,142,000,000
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 |
5,512,000,000
GBP
|
13,000,000
GBP
|
5,525,000,000
GBP
|
1,308,000,000
GBP
|
234,000,000
GBP
|
2,000,000
GBP
|
13,000,000
GBP
|
3,742,000,000
GBP
|
213,000,000
GBP
|
— |
6,753,000,000
GBP
|
213,000,000
GBP
|
2,000,000
GBP
|
234,000,000
GBP
|
1,307,000,000
GBP
|
4,994,000,000
GBP
|
6,768,000,000
GBP
|
15,000,000
GBP
|
3,000,000
GBP
|
2,000,000
GBP
|
213,000,000
GBP
|
4,184,000,000
GBP
|
6,013,000,000
GBP
|
234,000,000
GBP
|
1,307,000,000
GBP
|
14,000,000
GBP
|
59,000,000
GBP
|
5,954,000,000
GBP
|
4,154,000,000
GBP
|
234,000,000
GBP
|
5, 983
GBP
|
5,924,000,000
GBP
|
59,000,000
GBP
|
1,307,000,000
GBP
|
14,000,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
213,000,000
GBP
|
2,000,000
GBP
|
–
GBP
|
30,000,000
GBP
|
30,000,000
GBP
|
–
GBP
|
30,000,000
GBP
|
| Reconciliation of changes in fair value measurement, entity's own equity instruments [abstract] |