Analysis Of Income And Expense [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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Analysis of income and expense [abstract] | |||||||||||||||||||||
| Revenue [abstract] | |||||||||||||||||||||
| Revenue |
11,302,000,000
GBP
|
— | — | — | — | — | — | — | — |
10,858,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
9,545,000,000
GBP
|
— |
| Material income and expense [abstract] | |||||||||||||||||||||
| Research and development expense |
311,000,000
GBP
|
— | — | — | — | — | — | — | — |
300,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
257,000,000
GBP
|
— |
| Finance income (cost) |
368,000,000
GBP
|
— | — | — | — | — | — | — | — |
207,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
2,000,000
GBP
|
— |
| Other operating income (expense) |
27,000,000
GBP
|
— | — | — | — | — | — | — | — |
31,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
31,000,000
GBP
|
— |
| Selling, general and administrative expense [abstract] | |||||||||||||||||||||
| Selling, general and administrative expense |
4,413,000,000
GBP
|
— | — | — | — | — | — | — | — |
4,483,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
4,086,000,000
GBP
|
— |
| Miscellaneous other comprehensive income [abstract] | |||||||||||||||||||||
| Other comprehensive income, before tax, exchange differences on translation of foreign operations and hedges of net investments in foreign operations [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
|
— |
| Income tax relating to components of other comprehensive income [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 |
4,000,000
GBP
|
— | — | — | — | — | — | — | — |
44,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
2,000,000
GBP
|
— |
| Comprehensive income, continuing and discontinued operations [abstract] | |||||||||||||||||||||
| 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 owners of parent, continuing and discontinued operations [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, continuing and discontinued operations [abstract] | |||||||||||||||||||||
| Comprehensive income, attributable to non-controlling interests |
55,000,000
GBP
|
— | — | — | — | — | — | — | — |
49,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
49,000,000
GBP
|
— |