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 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 2022-12-31 |
As at 2022-12-31 |
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 |
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 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of financial position [abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Assets [abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Non-current assets [abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Investments in subsidiaries, joint ventures and associates reported in separate financial statements |
665,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
728,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
743,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Deferred tax assets |
1,278,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
1,583,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
798,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Current assets [abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Cash and cash equivalents |
177,037,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
189,907,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
140,923,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
125,304,000,000
GBP
|
— | — | — |
| Assets |
702,970,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
716,646,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
596,027,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Equity and liabilities [abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Equity [abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Issued capital |
797,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
797,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
797,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Retained earnings |
24,724,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
24,368,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
24,157,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Share premium |
1,004,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
420,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
—
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Other equity interest |
3,930,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
3,930,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
3,722,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Other reserves |
6,096,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
6,413,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
5,662,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Equity attributable to owners of parent |
24,359,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
23,102,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
23,014,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Non-controlling interests |
146,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
131,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
131,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Equity |
24,505,000,000
GBP
|
616,000,000
GBP
|
24,724,000,000
GBP
|
146,000,000
GBP
|
2,178,000,000
GBP
|
1,801,000,000
GBP
|
24,359,000,000
GBP
|
330,000,000
GBP
|
868,000,000
GBP
|
7,692,000,000
GBP
|
3,930,000,000
GBP
|
23,233,000,000
GBP
|
894,000,000
GBP
|
7,692,000,000
GBP
|
1,217,000,000
GBP
|
131,000,000
GBP
|
24,368,000,000
GBP
|
1,613,000,000
GBP
|
23,102,000,000
GBP
|
3,930,000,000
GBP
|
278,000,000
GBP
|
950,000,000
GBP
|
522,000,000
GBP
|
24,157,000,000
GBP
|
7,000,000
GBP
|
3,722,000,000
GBP
|
23,715,000,000
GBP
|
578,000,000
GBP
|
23,145,000,000
GBP
|
570,000,000
GBP
|
570,000,000
GBP
|
7,000,000
GBP
|
514,000,000
GBP
|
7,692,000,000
GBP
|
797,000,000
GBP
|
3,722,000,000
GBP
|
24,735,000,000
GBP
|
1,603,000,000
GBP
|
23,584,000,000
GBP
|
948,000,000
GBP
|
7,692,000,000
GBP
|
131,000,000
GBP
|
514,000,000
GBP
|
797,000,000
GBP
|
1,081,000,000
GBP
|
—
GBP
|
23,014,000,000
GBP
|
131,000,000
GBP
|
948,000,000
GBP
|
23,829,000,000
GBP
|
183,000,000
GBP
|
158,000,000
GBP
|
23,666,000,000
GBP
|
3,722,000,000
GBP
|
1,543,000,000
GBP
|
23,849,000,000
GBP
|
1,309,000,000
GBP
|
7,692,000,000
GBP
|
797,000,000
GBP
|
| Liabilities [abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Non-current liabilities [abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Deferred tax liabilities |
6,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
3,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
5,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Current liabilities [abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Liabilities included in disposal groups classified as held for sale |
20,684,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
24,711,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
—
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Liabilities |
678,465,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
693,413,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
572,882,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Equity and liabilities |
702,970,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
716,646,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
596,027,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |