Statement Of Financial Position [Abstract]
| Concept |
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 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of financial position [abstract] | |||||||||||||||||||||||||||||||||||||
| Assets [abstract] | |||||||||||||||||||||||||||||||||||||
| Non-current assets [abstract] | |||||||||||||||||||||||||||||||||||||
| Property, plant and equipment | — | — | — |
428,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
768,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Investment property | — | — | — |
7,003,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
11,369,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Goodwill | — | — | — |
1,741,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
1,799,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Intangible assets other than goodwill | — | — | — |
1,950,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
2,434,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Deferred tax assets | — | — | — |
138,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
119,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Current assets [abstract] | |||||||||||||||||||||||||||||||||||||
| Cash and cash equivalents | — | — | — |
12,485,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
16,900,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Assets | — | — | — |
358,474,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
479,857,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Equity and liabilities [abstract] | |||||||||||||||||||||||||||||||||||||
| Equity [abstract] | |||||||||||||||||||||||||||||||||||||
| Issued capital | — | — | — |
1,141,000,000
GBP
|
— | — | — | — |
941,000,000
GBP
|
200,000,000
GBP
|
— | — | — | — | — | — |
982,000,000
GBP
|
— | — | — |
200,000,000
GBP
|
— |
1,182,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Retained earnings | — | — | — |
7,556,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
7,468,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Share premium | — | — | — |
1,248,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
1,242,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Treasury shares | — | — | — |
51,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
6,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Other reserves | — | — | — |
66,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
212,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Equity attributable to owners of parent | — | — | — |
19,202,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
19,554,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Non-controlling interests | — | — | — |
252,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
1,006,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Equity |
51,000,000
GBP
|
7,556,000,000
GBP
|
66,000,000
GBP
|
19,454,000,000
GBP
|
941,000,000
GBP
|
200,000,000
GBP
|
10,308,000,000
GBP
|
—
GBP
|
— | — |
19,202,000,000
GBP
|
252,000,000
GBP
|
314,000,000
GBP
|
7,468,000,000
GBP
|
1,006,000,000
GBP
|
19,554,000,000
GBP
|
— |
6,000,000
GBP
|
862,000,000
GBP
|
212,000,000
GBP
|
— |
10,260,000,000
GBP
|
20,560,000,000
GBP
|
200,000,000
GBP
|
—
GBP
|
982,000,000
GBP
|
17,708,000,000
GBP
|
977,000,000
GBP
|
980,000,000
GBP
|
101,000,000
GBP
|
814,000,000
GBP
|
10,257,000,000
GBP
|
200,000,000
GBP
|
18,685,000,000
GBP
|
5,065,000,000
GBP
|
7,000,000
GBP
|
500,000,000
GBP
|
| Liabilities [abstract] | |||||||||||||||||||||||||||||||||||||
| Non-current liabilities [abstract] | |||||||||||||||||||||||||||||||||||||
| Deferred tax liabilities | — | — | — |
1,983,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
1,828,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Current liabilities [abstract] | |||||||||||||||||||||||||||||||||||||
| Liabilities included in disposal groups classified as held for sale | — | — | — |
—
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
17,176,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Liabilities | — | — | — |
339,020,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
459,297,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Equity and liabilities | — | — | — |
358,474,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
479,857,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |