Statement Of Financial Position [Abstract]
| Concept |
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 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 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 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 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 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of financial position [abstract] | |||||||||||||||||||||||||||||||||||||||||||||
| Assets [abstract] | |||||||||||||||||||||||||||||||||||||||||||||
| Non-current assets [abstract] | |||||||||||||||||||||||||||||||||||||||||||||
| Property, plant and equipment | — | — |
22,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
27,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Investment property | — | — |
5,677,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
7, 032
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Other non-current financial assets | — | — |
58,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
41,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Non-current assets | — | — |
5,677,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
7,032,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Current assets [abstract] | |||||||||||||||||||||||||||||||||||||||||||||
| Trade and other current receivables | — | — |
34,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
60,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Cash and cash equivalents | — | — |
125,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
111,000,000
GBP
|
— | — | — | — | — |
191,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Current assets | — | — |
183,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
19 2
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Assets | — | — |
8,290,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
9,910,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Equity and liabilities [abstract] | |||||||||||||||||||||||||||||||||||||||||||||
| Equity [abstract] | |||||||||||||||||||||||||||||||||||||||||||||
| Issued capital | — | — |
234,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
234,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Retained earnings | — | — |
3,742,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
4,994,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Share premium | — | — |
1,308,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
1,307,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Other reserves | — | — |
15,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
5,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Equity attributable to owners of parent | — | — |
5,512,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
6,753,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Non-controlling interests | — | — |
13,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
15,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| 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
|
| Liabilities [abstract] | |||||||||||||||||||||||||||||||||||||||||||||
| Non-current liabilities [abstract] | |||||||||||||||||||||||||||||||||||||||||||||
| Deferred tax liabilities | — | — |
4,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
–
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Non-current liabilities | — | — |
2,081,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
2,675,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Current liabilities [abstract] | |||||||||||||||||||||||||||||||||||||||||||||
| Trade and other current payables | — | — |
282,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
278,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Current liabilities | — | — |
684,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
467,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Liabilities | — | — |
2,765,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
3,142,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |