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 |
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 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of comprehensive income [abstract] | ||||||||||||||||||||
| Profit (loss) |
—
GBP
|
1,106,000,000
GBP
|
1,085,000,000
GBP
|
—
GBP
|
21,000,000
GBP
|
1,085,000,000
GBP
|
—
GBP
|
—
GBP
|
—
GBP
|
—
GBP
|
—
GBP
|
—
GBP
|
1,030,000,000
GBP
|
1,051,000,000
GBP
|
21,000,000
GBP
|
—
GBP
|
—
GBP
|
—
GBP
|
—
GBP
|
1,051,000,000
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 | — |
495,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
1,542,000,000
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 | — |
86,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
119,000,000
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 | — |
—
GBP
|
— | — | — | — | — | — | — | — | — | — |
38,000,000
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 | — |
122,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
412,000,000
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 | — |
2,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
6,000,000
GBP
|
— | — | — | — | — | — | — |
| Other comprehensive income |
—
GBP
|
461,000,000
GBP
|
458,000,000
GBP
|
85,000,000
GBP
|
3,000,000
GBP
|
373,000,000
GBP
|
—
GBP
|
—
GBP
|
—
GBP
|
—
GBP
|
—
GBP
|
95,000,000
GBP
|
1,043,000,000
GBP
|
1,130,000,000
GBP
|
8,000,000
GBP
|
—
GBP
|
—
GBP
|
—
GBP
|
—
GBP
|
1,035,000,000
GBP
|
| Comprehensive income |
—
GBP
|
645,000,000
GBP
|
627,000,000
GBP
|
85,000,000
GBP
|
18,000,000
GBP
|
712,000,000
GBP
|
—
GBP
|
—
GBP
|
—
GBP
|
—
GBP
|
—
GBP
|
95,000,000
GBP
|
2,073,000,000
GBP
|
2,181,000,000
GBP
|
13,000,000
GBP
|
—
GBP
|
—
GBP
|
—
GBP
|
—
GBP
|
2,086,000,000
GBP
|
| Comprehensive income attributable to [abstract] | ||||||||||||||||||||
| Comprehensive income, attributable to owners of parent | — |
627,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
2,086,000,000
GBP
|
— | — | — | — | — | — | — |
| Comprehensive income, attributable to non-controlling interests | — |
18,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
13,000,000
GBP
|
— | — | — | — | — | — | — |