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 |
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of comprehensive income [abstract] | |||||||||||||||||||
| Profit (loss) | — |
232,000,000
GBP
|
232,000,000
GBP
|
— | — | — | — | — | — | — | — |
263,000,000
GBP
|
263,000,000
GBP
|
186,000,000
GBP
|
186,000,000
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) on remeasurements of defined benefit plans | — |
2,000,000
GBP
|
2,000,000
GBP
|
— | — | — | — | — | — | — | — |
1,000,000
GBP
|
1,000,000
GBP
|
13,000,000
GBP
|
13,000,000
GBP
|
— | — | — | — |
| Components of other comprehensive income that will be reclassified to profit or loss, before tax [abstract] | |||||||||||||||||||
| Exchange differences on translation [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
|
| Cash flow hedges [abstract] | |||||||||||||||||||
| Gains (losses) on cash flow hedges, before tax | — |
137,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
15,000,000
GBP
|
— |
15,000,000
GBP
|
— | — | — | — | — |
| Reclassification adjustments on cash flow hedges, before tax | — |
25,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
28,000,000
GBP
|
— |
20,000,000
GBP
|
— | — | — | — | — |
| Amounts removed from equity and included in carrying amount of non-financial asset (liability) whose acquisition or incurrence was hedged highly probable forecast transaction, before tax | — |
118,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
nil
GBP
|
— |
nil
GBP
|
— | — | — | — | — |
| Other comprehensive income, before tax, cash flow hedges |
6,000,000
GBP
|
6,000,000
GBP
|
— |
6,000,000
GBP
|
— | — |
13,000,000
GBP
|
— |
13,000,000
GBP
|
— | — |
13,000,000
GBP
|
— |
5,000,000
GBP
|
— | — |
5,000,000
GBP
|
5,000,000
GBP
|
— |
| Hedges of net investment in foreign operations [abstract] | |||||||||||||||||||
| 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
|
| Other comprehensive income | — |
295,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
12,000,000
GBP
|
— |
67,000,000
GBP
|
— | — | — | — | — |
| 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 [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 | — |
–
GBP
|
— | — | — | — | — | — | — | — | — |
–
GBP
|
— |
–
GBP
|
— | — | — | — | — |