Statement Of Financial Position [Abstract]
| Concept |
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 2020-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
As at 2020-03-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of financial position [abstract] | |||||||||||||||||||||||||||
| Assets [abstract] | |||||||||||||||||||||||||||
| Non-current assets [abstract] | |||||||||||||||||||||||||||
| Property, plant and equipment | — | — | — | — | — | — |
27,000,000
GBP
|
— | — | — | — | — |
30,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Investment property | — | — | — | — | — | — |
7,032,000,000
GBP
|
— | — | — | — | — |
6,326,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Trade and other non-current receivables | — | — | — | — | — | — |
–
GBP
|
— | — | — | — | — |
6,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Other non-current financial assets | — | — | — | — | — | — |
41,000,000
GBP
|
— | — | — | — | — |
20,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Non-current assets | — | — | — | — | — | — |
7,032,000,000
GBP
|
— | — | — | — | — |
6,328,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Current assets [abstract] | |||||||||||||||||||||||||||
| Trade and other current receivables | — | — | — | — | — | — |
39,000,000
GBP
|
— | — | — | — | — |
56,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Cash and cash equivalents | — | — | — | — | — | — |
74,000,000
GBP
|
— | — | — | — | — |
154,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
193,000,000
GBP
|
— | — | — | — |
| Current assets | — | — | — | — | — | — |
134,000,000
GBP
|
— | — | — | — | — |
236,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Assets | — | — | — | — | — | — |
9,842,000,000
GBP
|
— | — | — | — | — |
8,875,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Equity and liabilities [abstract] | |||||||||||||||||||||||||||
| Equity [abstract] | |||||||||||||||||||||||||||
| Issued capital | — | — | — | — | — | — |
234,000,000
GBP
|
— | — | — | — | — |
234,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Retained earnings | — | — | — | — | — | — |
4,959,000,000
GBP
|
— | — | — | — | — |
4,154,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Share premium | — | — | — | — | — | — |
1,307,000,000
GBP
|
— | — | — | — | — |
1,307,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Other reserves | — | — | — | — | — | — |
5,000,000
GBP
|
— | — | — | — | — |
16,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Equity attributable to owners of parent | — | — | — | — | — | — |
6,718,000,000
GBP
|
— | — | — | — | — |
5,924,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Non-controlling interests | — | — | — | — | — | — |
15,000,000
GBP
|
— | — | — | — | — |
59,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Equity |
6,718,000,000
GBP
|
213,000,000
GBP
|
2,000,000
GBP
|
234,000,000
GBP
|
1,307,000,000
GBP
|
4,959,000,000
GBP
|
6,733,000,000
GBP
|
15,000,000
GBP
|
3,000,000
GBP
|
2,000,000
GBP
|
4,154,000,000
GBP
|
213,000,000
GBP
|
5,983,000,000
GBP
|
234,000,000
GBP
|
1,307,000,000
GBP
|
14,000,000
GBP
|
59,000,000
GBP
|
5,924,000,000
GBP
|
112,000,000
GBP
|
7,035,000,000
GBP
|
234,000,000
GBP
|
213,000,000
GBP
|
7,147,000,000
GBP
|
26,000,000
GBP
|
1,307,000,000
GBP
|
12,000,000
GBP
|
5,243,000,000
GBP
|
| Liabilities [abstract] | |||||||||||||||||||||||||||
| Non-current liabilities [abstract] | |||||||||||||||||||||||||||
| Non-current liabilities | — | — | — | — | — | — |
2,675,000,000
GBP
|
— | — | — | — | — |
2,505,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Current liabilities [abstract] | |||||||||||||||||||||||||||
| Trade and other current payables | — | — | — | — | — | — |
245,000,000
GBP
|
— | — | — | — | — |
219,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Current liabilities | — | — | — | — | — | — |
434,000,000
GBP
|
— | — | — | — | — |
387,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Liabilities | — | — | — | — | — | — |
3,109,000,000
GBP
|
— | — | — | — | — |
2,892,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |