Statement Of Financial Position [Abstract]
| Concept |
As at 2023-12-31 |
As at 2023-12-31 |
As at 2023-12-31 |
As at 2023-12-31 |
As at 2023-12-31 |
As at 2023-12-31 |
As at 2023-12-31 |
As at 2023-12-31 |
As at 2023-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-01-01 |
As at 2022-01-01 |
As at 2022-01-01 |
As at 2022-01-01 |
As at 2022-01-01 |
As at 2022-01-01 |
As at 2022-01-01 |
As at 2022-01-01 |
As at 2022-01-01 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of financial position [abstract] | ||||||||||||||||||||||||||||||||||||||||||||||
| Assets [abstract] | ||||||||||||||||||||||||||||||||||||||||||||||
| Non-current assets [abstract] | ||||||||||||||||||||||||||||||||||||||||||||||
| Property, plant and equipment |
2,065,000,000
GBP
|
— | — | — | — | — | — | — | — |
1,953,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
2,536,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Investment property |
15,422,000,000
GBP
|
— | — | — | — | — | — | — | — |
16,505,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
19,698,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Investments accounted for using equity method |
287,000,000
GBP
|
— | — | — | — | — | — | — | — |
413,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
469,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Deferred tax assets |
443,000,000
GBP
|
— | — | — | — | — | — | — | — |
445,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
114,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Current assets [abstract] | ||||||||||||||||||||||||||||||||||||||||||||||
| Cash and cash equivalents |
5,590,000,000
GBP
|
— | — | — | — | — | — | — | — |
4,884,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
6,908,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Assets |
189,622,000,000
GBP
|
— | — | — | — | — | — | — | — |
191,158,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
219,383,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Equity and liabilities [abstract] | ||||||||||||||||||||||||||||||||||||||||||||||
| Equity [abstract] | ||||||||||||||||||||||||||||||||||||||||||||||
| Issued capital |
119,000,000
GBP
|
— | — | — | — | — | — | — | — |
119,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
130,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Retained earnings |
15,223,000,000
GBP
|
— | — | — | — | — | — | — | — |
15,504,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
18,469,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Share premium |
379,000,000
GBP
|
— | — | — | — | — | — | — | — |
370,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
370,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Treasury shares |
21,000,000
GBP
|
— | — | — | — | — | — | — | — |
47,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
1,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Other reserves |
11,633,000,000
GBP
|
— | — | — | — | — | — | — | — |
11,613,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
11,660,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Equity attributable to owners of parent |
4,041,000,000
GBP
|
— | — | — | — | — | — | — | — |
4,263,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
7,215,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Non-controlling interests |
43,000,000
GBP
|
— | — | — | — | — | — | — | — |
48,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
49,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Equity |
4,084,000,000
GBP
|
15,223,000,000
GBP
|
11,633,000,000
GBP
|
43,000,000
GBP
|
379,000,000
GBP
|
119,000,000
GBP
|
21,000,000
GBP
|
4,041,000,000
GBP
|
26,000,000
GBP
|
4,311,000,000
GBP
|
11,613,000,000
GBP
|
48,000,000
GBP
|
370,000,000
GBP
|
15,504,000,000
GBP
|
47,000,000
GBP
|
119,000,000
GBP
|
4,263,000,000
GBP
|
70,000,000
GBP
|
7,215,000,000
GBP
|
18,469,000,000
GBP
|
370,000,000
GBP
|
130,000,000
GBP
|
49,000,000
GBP
|
1,000,000
GBP
|
11,660,000,000
GBP
|
7,264,000,000
GBP
|
93,000,000
GBP
|
1,000,000
GBP
|
5,345,000,000
GBP
|
1,919,000,000
GBP
|
—
GBP
|
7,264,000,000
GBP
|
1,919,000,000
GBP
|
—
GBP
|
1,919,000,000
GBP
|
—
GBP
|
370,000,000
GBP
|
11,660,000,000
GBP
|
16,550,000,000
GBP
|
5,296,000,000
GBP
|
49,000,000
GBP
|
130,000,000
GBP
|
—
GBP
|
—
GBP
|
—
GBP
|
93,000,000
GBP
|
| Liabilities [abstract] | ||||||||||||||||||||||||||||||||||||||||||||||
| Non-current liabilities [abstract] | ||||||||||||||||||||||||||||||||||||||||||||||
| Deferred tax liabilities |
682,000,000
GBP
|
— | — | — | — | — | — | — | — |
795,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
1,718,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Current liabilities [abstract] | ||||||||||||||||||||||||||||||||||||||||||||||
| Liabilities included in disposal groups classified as held for sale |
665,000,000
GBP
|
— | — | — | — | — | — | — | — |
172,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
—
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Liabilities |
185,538,000,000
GBP
|
— | — | — | — | — | — | — | — |
186,847,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
212,119,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Equity and liabilities |
189,622,000,000
GBP
|
— | — | — | — | — | — | — | — |
191,158,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
219,383,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |