Statement Of Comprehensive Income [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 |
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of comprehensive income [abstract] | |||||||||||||||||||||
| Profit (loss) |
1,111,000,000
GBP
|
1,049,000,000
GBP
|
—
GBP
|
62,000,000
GBP
|
1,049,000,000
GBP
|
—
GBP
|
—
GBP
|
—
GBP
|
—
GBP
|
1,119,000,000
GBP
|
1,060,000,000
GBP
|
59,000,000
GBP
|
1,060,000,000
GBP
|
—
GBP
|
49,000,000
GBP
|
—
GBP
|
1,390,000,000
GBP
|
—
GBP
|
—
GBP
|
1,439,000,000
GBP
|
1,390,000,000
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 |
5,000,000
GBP
|
— | — | — | — | — | — | — | — |
123,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
27,000,000
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 |
420,000,000
GBP
|
— | — | — | — | — | — | — | — |
598,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
34,000,000
GBP
|
— |
| Cash flow hedges [abstract] | |||||||||||||||||||||
| Gains (losses) on cash flow hedges, before tax |
8,000,000
GBP
|
— | — | — | — | — | — | — | — |
204,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
11,000,000
GBP
|
— |
| Reclassification adjustments on cash flow hedges, before tax |
23,000,000
GBP
|
— | — | — | — | — | — | — | — |
18,000,000
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 |
1,000,000
GBP
|
— | — | — | — | — | — | — | — |
29,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
12,000,000
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 |
2,000,000
GBP
|
— | — | — | — | — | — | — | — |
48,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Income tax relating to components of other comprehensive income that will be reclassified to profit or loss |
4,000,000
GBP
|
— | — | — | — | — | — | — | — |
44,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
2,000,000
GBP
|
— |
| Other comprehensive income |
432,000,000
GBP
|
425,000,000
GBP
|
431,000,000
GBP
|
7,000,000
GBP
|
6,000,000
GBP
|
—
GBP
|
—
GBP
|
—
GBP
|
740,000,000
GBP
|
824,000,000
GBP
|
94,000,000
GBP
|
10,000,000
GBP
|
834,000,000
GBP
|
—
GBP
|
—
GBP
|
25,000,000
GBP
|
10,000,000
GBP
|
—
GBP
|
—
GBP
|
10,000,000
GBP
|
15,000,000
GBP
|
| Comprehensive income |
679,000,000
GBP
|
624,000,000
GBP
|
431,000,000
GBP
|
55,000,000
GBP
|
1,055,000,000
GBP
|
—
GBP
|
—
GBP
|
—
GBP
|
740,000,000
GBP
|
1,943,000,000
GBP
|
1,154,000,000
GBP
|
49,000,000
GBP
|
1,894,000,000
GBP
|
—
GBP
|
49,000,000
GBP
|
25,000,000
GBP
|
1,380,000,000
GBP
|
—
GBP
|
—
GBP
|
1,429,000,000
GBP
|
1,405,000,000
GBP
|
| Comprehensive income attributable to [abstract] | |||||||||||||||||||||
| Comprehensive income, attributable to owners of parent |
624,000,000
GBP
|
— | — | — | — | — | — | — | — |
1,894,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
1,380,000,000
GBP
|
— |
| Comprehensive income, attributable to non-controlling interests |
55,000,000
GBP
|
— | — | — | — | — | — | — | — |
49,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
49,000,000
GBP
|
— |