Statement Of Financial Position [Abstract]
| Concept |
As at 2022-09-17 |
As at 2022-09-17 |
As at 2022-09-17 |
As at 2022-09-17 |
As at 2022-09-17 |
As at 2022-09-17 |
As at 2022-09-17 |
As at 2022-09-17 |
As at 2021-09-18 |
As at 2021-09-18 |
As at 2021-09-18 |
As at 2021-09-18 |
As at 2021-09-18 |
As at 2021-09-18 |
As at 2021-09-18 |
As at 2021-09-18 |
As at 2020-09-12 |
As at 2020-09-12 |
As at 2020-09-12 |
As at 2020-09-12 |
As at 2020-09-12 |
As at 2020-09-12 |
As at 2020-09-12 |
As at 2020-09-12 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of financial position [abstract] | ||||||||||||||||||||||||
| Assets [abstract] | ||||||||||||||||||||||||
| Property, plant and equipment |
5,599,000,000
GBP
|
— | — | — | — | — | — | — |
5,286,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Right-of-use assets |
2,456,000,000
GBP
|
— | — | — | — | — | — | — |
2,649,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Deferred tax assets |
158,000,000
GBP
|
— | — | — | — | — | — | — |
218,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Cash and cash equivalents |
2,121,000,000
GBP
|
— | — | — | — | — | — | — |
2,275,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Assets |
19,775,000,000
GBP
|
— | — | — | — | — | — | — |
16,895,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Equity and liabilities [abstract] | ||||||||||||||||||||||||
| Equity [abstract] | ||||||||||||||||||||||||
| Issued capital |
45,000,000
GBP
|
— | — | — | — | — | — | — |
45,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Retained earnings |
10,649,000,000
GBP
|
— | — | — | — | — | — | — |
9,692,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Other reserves |
178,000,000
GBP
|
— | — | — | — | — | — | — |
175,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Equity attributable to owners of parent |
11,448,000,000
GBP
|
— | — | — | — | — | — | — |
9,921,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Non-controlling interests |
106,000,000
GBP
|
— | — | — | — | — | — | — |
83,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Equity |
11,554,000,000
GBP
|
178,000,000
GBP
|
45,000,000
GBP
|
154,000,000
GBP
|
422,000,000
GBP
|
10,649,000,000
GBP
|
106,000,000
GBP
|
11,448,000,000
GBP
|
10,004,000,000
GBP
|
175,000,000
GBP
|
45,000,000
GBP
|
43,000,000
GBP
|
34,000,000
GBP
|
9,692,000,000
GBP
|
83,000,000
GBP
|
9,921,000,000
GBP
|
175,000,000
GBP
|
45,000,000
GBP
|
84,000,000
GBP
|
9,355,000,000
GBP
|
9,439,000,000
GBP
|
323,000,000
GBP
|
8,819,000,000
GBP
|
7,000,000
GBP
|
| Liabilities [abstract] | ||||||||||||||||||||||||
| Current tax liabilities |
160,000,000
GBP
|
— | — | — | — | — | — | — |
172,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Deferred tax liabilities |
647,000,000
GBP
|
— | — | — | — | — | — | — |
363,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Liabilities |
8,221,000,000
GBP
|
— | — | — | — | — | — | — |
6,891,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |