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 |
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of comprehensive income [abstract] | ||||||||||||||||||||||||
| Profit (loss) |
–
GBP
|
–
GBP
|
1,119,000,000
GBP
|
1,060,000,000
GBP
|
59,000,000
GBP
|
1,060,000,000
GBP
|
–
GBP
|
–
GBP
|
49,000,000
GBP
|
–
GBP
|
1,390,000,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
1,439,000,000
GBP
|
1,390,000,000
GBP
|
1,181,000,000
GBP
|
1,145,000,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
36,000,000
GBP
|
–
GBP
|
1,145,000,000
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 | — | — |
123,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
27,000,000
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 | — | — |
598,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
34,000,000
GBP
|
— |
170,000,000
GBP
|
— | — | — | — | — | — | — |
| Cash flow hedges [abstract] | ||||||||||||||||||||||||
| Gains (losses) on cash flow hedges, before tax | — | — |
204,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
11,000,000
GBP
|
— |
–
GBP
|
— | — | — | — | — | — | — |
| Reclassification adjustments on cash flow hedges, before tax | — | — |
18,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
–
GBP
|
— |
–
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 | — | — |
29,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
12,000,000
GBP
|
— |
13,000,000
GBP
|
— | — | — | — | — | — | — |
| Income tax relating to components of other comprehensive income that will be reclassified to profit or loss [abstract] | ||||||||||||||||||||||||
| Income tax relating to cash flow hedges included in other comprehensive income | — | — |
48,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Income tax relating to components of other comprehensive income that will be reclassified to profit or loss | — | — |
44,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
2,000,000
GBP
|
— |
–
GBP
|
— | — | — | — | — | — | — |
| Other comprehensive income |
–
GBP
|
142,000,000
GBP
|
824,000,000
GBP
|
94,000,000
GBP
|
10,000,000
GBP
|
834,000,000
GBP
|
–
GBP
|
598,000,000
GBP
|
–
GBP
|
9,000,000
GBP
|
10,000,000
GBP
|
–
GBP
|
34,000,000
GBP
|
–
GBP
|
10,000,000
GBP
|
15,000,000
GBP
|
169,000,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
170,000,000
GBP
|
1,000,000
GBP
|
–
GBP
|
170,000,000
GBP
|
| Comprehensive income |
–
GBP
|
142,000,000
GBP
|
1,943,000,000
GBP
|
1,154,000,000
GBP
|
49,000,000
GBP
|
1,894,000,000
GBP
|
–
GBP
|
598,000,000
GBP
|
49,000,000
GBP
|
9,000,000
GBP
|
1,380,000,000
GBP
|
–
GBP
|
34,000,000
GBP
|
–
GBP
|
1,429,000,000
GBP
|
1,405,000,000
GBP
|
1,012,000,000
GBP
|
1,145,000,000
GBP
|
–
GBP
|
–
GBP
|
170,000,000
GBP
|
37,000,000
GBP
|
–
GBP
|
975,000,000
GBP
|
| Comprehensive income attributable to [abstract] | ||||||||||||||||||||||||
| Comprehensive income, attributable to owners of parent | — | — |
1,894,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
1,380,000,000
GBP
|
— |
975,000,000
GBP
|
— | — | — | — | — | — | — |
| Comprehensive income, attributable to non-controlling interests | — | — |
49,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
49,000,000
GBP
|
— |
37,000,000
GBP
|
— | — | — | — | — | — | — |