Analysis Of Income And Expense [Abstract]
| Concept |
2023-01-01 to 2023-12-31 |
2023-01-01 to 2023-12-31 |
2023-01-01 to 2023-12-31 |
2023-01-01 to 2023-12-31 |
2023-01-01 to 2023-12-31 |
2023-01-01 to 2023-12-31 |
2023-01-01 to 2023-12-31 |
2023-01-01 to 2023-12-31 |
2023-01-01 to 2023-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Analysis of income and expense [abstract] | ||||||||||||||||||
| Material income and expense [abstract] | ||||||||||||||||||
| Expense of restructuring activities | — |
152,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
214,000,000
GBP
|
— | — | — | — | — | — |
| Expenses by nature [abstract] | ||||||||||||||||||
| Classes of employee benefits expense [abstract] | ||||||||||||||||||
| Employee benefits expense | — |
529,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
549,000,000
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 | — |
1,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
5,000,000
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 | — |
4,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
-
GBP
|
— | — | — | — | — | — |
| Share of other comprehensive income of associates and joint ventures accounted for using equity method, before tax [abstract] | ||||||||||||||||||
| Share of other comprehensive income of associates and joint ventures accounted for using equity method that will be reclassified to profit or loss, before tax | — |
27,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
57,000,000
GBP
|
— | — | — | — | — | — |
| Income tax relating to components of other comprehensive income [abstract] | ||||||||||||||||||
| Income tax relating to components of other comprehensive income that will be reclassified to profit or loss | — |
3,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
2,000,000
GBP
|
— | — | — | — | — | — |
| Comprehensive income, continuing and discontinued operations [abstract] | ||||||||||||||||||
| Comprehensive income |
–
GBP
|
203,000,000
GBP
|
–
GBP
|
11,000,000
GBP
|
–
GBP
|
169,000,000
GBP
|
–
GBP
|
214,000,000
GBP
|
45,000,000
GBP
|
–
GBP
|
1,367,000,000
GBP
|
1,355,000,000
GBP
|
41,000,000
GBP
|
–
GBP
|
1,000,000
GBP
|
1,408,000,000
GBP
|
11,000,000
GBP
|
–
GBP
|
| Comprehensive income attributable to owners of parent, continuing and discontinued operations [abstract] | ||||||||||||||||||
| Comprehensive income, attributable to owners of parent | — |
214,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
1 ,367
GBP
|
— | — | — | — | — | — |
| Comprehensive income attributable to non-controlling interests, continuing and discontinued operations [abstract] | ||||||||||||||||||
| Comprehensive income, attributable to non-controlling interests | — |
–
GBP
|
— | — | — | — | — | — | — | — | — |
1,000,000
GBP
|
— | — | — | — | — | — |