Analysis Of Income And Expense [Abstract]
| Concept |
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 |
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Analysis of income and expense [abstract] | |||||||||||||||||||
| Material income and expense [abstract] | |||||||||||||||||||
| Operating expense | — |
3,373,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
2,610,000,000
GBP
|
— |
2,509,000,000
GBP
|
— | — | — | — | — |
| Miscellaneous other comprehensive income [abstract] | |||||||||||||||||||
| Other comprehensive income, before tax, exchange differences on translation of foreign operations and hedges of net investments in foreign operations [abstract] | |||||||||||||||||||
| Other comprehensive income, before tax, exchange differences on translation of foreign operations |
232,000,000
GBP
|
232,000,000
GBP
|
— | — | — |
232,000,000
GBP
|
— | — |
18,000,000
GBP
|
— |
18,000,000
GBP
|
18,000,000
GBP
|
— |
35,000,000
GBP
|
— | — | — |
35,000,000
GBP
|
35,000,000
GBP
|
| Other comprehensive income, before tax, hedges of net investments in foreign operations |
68,000,000
GBP
|
68,000,000
GBP
|
— | — | — |
68,000,000
GBP
|
— | — |
15,000,000
GBP
|
— |
15,000,000
GBP
|
15,000,000
GBP
|
— |
17,000,000
GBP
|
— | — | — |
17,000,000
GBP
|
17,000,000
GBP
|
| Share of profit (loss) of associates and joint ventures accounted for using equity method [abstract] | |||||||||||||||||||
| Share of profit (loss) of associates accounted for using equity method | — |
9,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
8,000,000
GBP
|
— |
8,000,000
GBP
|
— | — | — | — | — |
| Income tax relating to components of other comprehensive income [abstract] | |||||||||||||||||||
| Income tax relating to components of other comprehensive income | — |
11,000,000
GBP
|
11,000,000
GBP
|
— | — | — | — | — | — | — | — |
2,000,000
GBP
|
2,000,000
GBP
|
4,000,000
GBP
|
4,000,000
GBP
|
— | — | — | — |
| Comprehensive income, continuing and discontinued operations [abstract] | |||||||||||||||||||
| Comprehensive income |
308,000,000
GBP
|
63,000,000
GBP
|
245,000,000
GBP
|
6,000,000
GBP
|
2,000,000
GBP
|
300,000,000
GBP
|
13,000,000
GBP
|
10,000,000
GBP
|
1,000,000
GBP
|
1,000,000
GBP
|
3,000,000
GBP
|
275,000,000
GBP
|
276,000,000
GBP
|
119,000,000
GBP
|
177,000,000
GBP
|
1,000,000
GBP
|
5,000,000
GBP
|
58,000,000
GBP
|
52,000,000
GBP
|
| Comprehensive income attributable to owners of parent, continuing and discontinued operations [abstract] | |||||||||||||||||||
| Comprehensive income, attributable to owners of parent | — |
63,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
275,000,000
GBP
|
— |
119,000,000
GBP
|
— | — | — | — | — |
| Comprehensive income attributable to non-controlling interests, continuing and discontinued operations [abstract] | |||||||||||||||||||
| Comprehensive income, attributable to non-controlling interests | — |
–
GBP
|
— | — | — | — | — | — | — | — | — |
–
GBP
|
— |
–
GBP
|
— | — | — | — | — |