Profit Or Loss [Abstract]
| Concept |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Profit or loss [abstract] | ||||||||||||||||||
| Profit (loss) [abstract] | ||||||||||||||||||
| Employee benefits expense | — | — | — | — | — | — | — |
604,000,000
GBP
|
— | — | — |
625,000,000
GBP
|
— | — | — | — | — | — |
| Finance costs | — | — | — | — | — | — | — |
30,000,000
GBP
|
— | — | — |
30,000,000
GBP
|
— | — | — | — | — | — |
| Share of profit (loss) of associates and joint ventures accounted for using equity method | — | — | — | — | — | — | — |
22,000,000
GBP
|
— | — | — |
194,000,000
GBP
|
— | — | — | — | — | — |
| Profit (loss) before tax | — | — | — | — | — | — | — |
1,115,000,000
GBP
|
— | — | — |
823,000,000
GBP
|
— | — | — | — | — | — |
| Tax expense (income) | — | — | — | — | — | — | — |
12 0
GBP
|
— | — | — |
15,000,000
GBP
|
— | — | — | — | — | — |
| Profit (loss) from continuing operations |
–
GBP
|
1,000,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
994,000,000
GBP
|
995,000,000
GBP
|
994,000,000
GBP
|
848,000,000
GBP
|
–
GBP
|
853,000,000
GBP
|
5,000,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
848,000,000
GBP
|
–
GBP
|
| Profit (loss) from discontinued operations | — | — | — | — | — | — | — |
–
GBP
|
— |
15,000,000
GBP
|
–
GBP
|
15,000,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
15,000,000
GBP
|
–
GBP
|
| Profit (loss) | — | — | — | — | — | — | — |
995,000,000
GBP
|
— | — | — |
838,000,000
GBP
|
— | — | — | — | — | — |
| Profit (loss), attributable to [abstract] | ||||||||||||||||||
| Profit (loss), attributable to owners of parent | — | — | — | — | — | — | — |
994,000,000
GBP
|
— | — | — |
833,000,000
GBP
|
— | — | — | — | — | — |
| Earnings per share [text block] | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Earnings per share [abstract] | ||||||||||||||||||
| Earnings per share [line items] | ||||||||||||||||||
| Basic earnings per share [abstract] | ||||||||||||||||||
| Basic earnings (loss) per share from continuing operations | — | — | — | — | — | — | — |
0.468
|
— | — | — |
0.385
|
— | — | — | — | — | — |
| Basic earnings (loss) per share | — | — | — | — | — | — | — |
0.468
|
— | — | — |
0.378
|
— | — | — | — | — | — |
| Diluted earnings per share [abstract] | ||||||||||||||||||
| Diluted earnings (loss) per share from continuing operations | — | — | — | — | — | — | — |
0.460
|
— | — | — |
0.379
|
— | — | — | — | — | — |
| Diluted earnings (loss) per share | — | — | — | — | — | — | — |
0.460
|
— | — | — |
0.372
|
— | — | — | — | — | — |