Analysis Of Income And Expense [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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Analysis of income and expense [abstract] | ||||||||||||||||||
| Revenue [abstract] | ||||||||||||||||||
| Revenue | — | — | — | — | — | — | — |
19, 52 1
GBP
|
— | — | — |
19 , 2 7 7
GBP
|
— | — | — | — | — | — |
| Material income and expense [abstract] | ||||||||||||||||||
| Finance income (cost) | — | — | — | — | — | — | — |
279,000,000
GBP
|
— | — | — |
33 4
GBP
|
— | — | — | — | — | — |
| Operating expense | — | — | — | — | — | — | — |
17, 74 3
GBP
|
— | — | — |
17 ,6 86
GBP
|
— | — | — | — | — | — |
| Share of profit (loss) of associates and joint ventures accounted for using equity method [abstract] | ||||||||||||||||||
| Share of profit (loss) of associates and joint ventures accounted for using equity method | — | — | — | — | — | — | — |
13 9
GBP
|
— | — | — |
69,000,000
GBP
|
— | — | — | — | — | — |
| Share of other comprehensive income of associates and joint ventures accounted for using equity method, net of tax [abstract] | ||||||||||||||||||
| Share of other comprehensive income of associates and joint ventures accounted for using equity method that will not be reclassified to profit or loss, net of tax | — | — |
–
GBP
|
64,000,000
GBP
|
— | — | — |
64,000,000
GBP
|
— | — | — |
55,000,000
GBP
|
— |
–
GBP
|
— | — | — |
55,000,000
GBP
|
| Share of other comprehensive income of associates and joint ventures accounted for using equity method that will be reclassified to profit or loss, net of tax | — | — |
4,000,000
GBP
|
–
GBP
|
— | — | — |
4,000,000
GBP
|
— | — | — |
3,000,000
GBP
|
— |
3,000,000
GBP
|
— | — | — |
–
GBP
|
| Income tax relating to components of other comprehensive income [abstract] | ||||||||||||||||||
| Income tax relating to components of other comprehensive income that will not be reclassified to profit or loss | — | — |
–
GBP
|
39 4
GBP
|
— | — | — |
3 94
GBP
|
— | — | — |
33 0
GBP
|
— |
–
GBP
|
— | — | — |
330,000,000
GBP
|
| Income tax relating to components of other comprehensive income that will be reclassified to profit or loss | — | — |
4,000,000
GBP
|
–
GBP
|
— | — | — |
4,000,000
GBP
|
— | — | — |
16,000,000
GBP
|
— |
1 6
GBP
|
— | — | — |
–
GBP
|
| Comprehensive income, continuing and discontinued operations [abstract] | ||||||||||||||||||
| Comprehensive income |
15 6
GBP
|
–
GBP
|
2,000,000
GBP
|
4 ,033
GBP
|
3,000,000
GBP
|
–
GBP
|
3, 879
GBP
|
4,035,000,000
GBP
|
3,8 82
GBP
|
213,000,000
GBP
|
–
GBP
|
95,000,000
GBP
|
58,000,000
GBP
|
19 0
GBP
|
–
GBP
|
37,000,000
GBP
|
17 6
GBP
|
285,000,000
GBP
|
| Comprehensive income attributable to owners of parent, continuing and discontinued operations [abstract] | ||||||||||||||||||
| Comprehensive income, attributable to owners of parent | — | — |
3,000,000
GBP
|
3,882,000,000
GBP
|
— | — | — |
3, 879
GBP
|
— | — | — |
37,000,000
GBP
|
— |
17 6
GBP
|
— | — | — |
213,000,000
GBP
|
| Comprehensive income attributable to non-controlling interests, continuing and discontinued operations [abstract] | ||||||||||||||||||
| Comprehensive income, attributable to non-controlling interests | — | — |
5,000,000
GBP
|
151,000,000
GBP
|
— | — | — |
15 6
GBP
|
— | — | — |
58,000,000
GBP
|
— |
14,000,000
GBP
|
— | — | — |
72,000,000
GBP
|