Statement Of Comprehensive Income [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 |
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 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of comprehensive income [abstract] | ||||||||||||||||||||
| Profit (loss) |
–
GBP
|
–
GBP
|
303,000,000
GBP
|
308,000,000
GBP
|
5,000,000
GBP
|
–
GBP
|
–
GBP
|
308,000,000
GBP
|
–
GBP
|
–
GBP
|
4,000,000
GBP
|
–
GBP
|
–
GBP
|
833,000,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
837,000,000
GBP
|
833,000,000
GBP
|
| Other comprehensive income [abstract] | ||||||||||||||||||||
| Components of other comprehensive income that will not be reclassified to profit or loss, before tax [abstract] | ||||||||||||||||||||
| Other comprehensive income, before tax, gains (losses) from investments in equity instruments | — | — |
34,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
43,000,000
GBP
|
— |
| Other comprehensive income, before tax, gains (losses) on remeasurements of defined benefit plans | — | — |
32,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
297,000,000
GBP
|
— |
| Components of other comprehensive income that will be reclassified to profit or loss, before tax [abstract] | ||||||||||||||||||||
| Exchange differences on translation [abstract] | ||||||||||||||||||||
| Gains (losses) on exchange differences on translation of foreign operations, before tax | — | — |
11,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
113,000,000
GBP
|
— |
| Other comprehensive income, before tax, exchange differences on translation of foreign operations | — | — |
593,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
101,000,000
GBP
|
— |
| Cash flow hedges [abstract] | ||||||||||||||||||||
| Gains (losses) on cash flow hedges, before tax | — | — |
39,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
54,000,000
GBP
|
— |
| Share of other comprehensive income of associates and joint ventures accounted for using equity method that will be reclassified to profit or loss, before tax | — | — |
13,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
13,000,000
GBP
|
— |
| Income tax relating to components of other comprehensive income that will not be reclassified to profit or loss [abstract] | ||||||||||||||||||||
| Income tax relating to components of other comprehensive income that will not be reclassified to profit or loss | — | — |
1,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
71,000,000
GBP
|
— |
| Income tax relating to components of other comprehensive income that will be reclassified to profit or loss [abstract] | ||||||||||||||||||||
| Income tax relating to components of other comprehensive income that will be reclassified to profit or loss | — | — |
5,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
19,000,000
GBP
|
— |
| Other comprehensive income |
–
GBP
|
–
GBP
|
496,000,000
GBP
|
67,000,000
GBP
|
1,000,000
GBP
|
–
GBP
|
–
GBP
|
495,000,000
GBP
|
–
GBP
|
562,000,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
375,000,000
GBP
|
–
GBP
|
–
GBP
|
106,000,000
GBP
|
–
GBP
|
375,000,000
GBP
|
269,000,000
GBP
|
| Comprehensive income |
–
GBP
|
–
GBP
|
193,000,000
GBP
|
375,000,000
GBP
|
6,000,000
GBP
|
–
GBP
|
–
GBP
|
187,000,000
GBP
|
–
GBP
|
562,000,000
GBP
|
4,000,000
GBP
|
–
GBP
|
–
GBP
|
1,208,000,000
GBP
|
–
GBP
|
–
GBP
|
106,000,000
GBP
|
–
GBP
|
1,212,000,000
GBP
|
1,102,000,000
GBP
|
| Comprehensive income attributable to [abstract] | ||||||||||||||||||||
| Comprehensive income, attributable to owners of parent | — | — |
187,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
1,208,000,000
GBP
|
— |
| Comprehensive income, attributable to non-controlling interests | — | — |
6,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
4,000,000
GBP
|
— |