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 |
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of comprehensive income [abstract] | ||||||||||||||||||||||||
| Profit (loss) |
4,632,000,000
GBP
|
— | — | — | — | — | — | — |
3,595,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
3,312,000,000
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 |
280,000,000
GBP
|
280,000,000
GBP
|
— |
280,000,000
GBP
|
— | — | — | — |
840,000,000
GBP
|
840,000,000
GBP
|
— | — | — | — |
840,000,000
GBP
|
— | — | — | — |
669,000,000
GBP
|
— | — |
669,000,000
GBP
|
669,000,000
GBP
|
| Other comprehensive income, before tax, change in fair value of financial liability attributable to change in credit risk of liability |
39,000,000
GBP
|
39,000,000
GBP
|
— |
39,000,000
GBP
|
— | — | — | — |
50,000,000
GBP
|
50,000,000
GBP
|
— | — | — | — |
50,000,000
GBP
|
— | — | — | — |
29,000,000
GBP
|
— | — |
29,000,000
GBP
|
29,000,000
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 |
239,000,000
GBP
|
239,000,000
GBP
|
— | — |
239,000,000
GBP
|
— | — | — |
512,000,000
GBP
|
— | — | — | — | — |
512,000,000
GBP
|
512,000,000
GBP
|
4,000,000
GBP
|
— | — |
484,000,000
GBP
|
484,000,000
GBP
|
— |
480,000,000
GBP
|
— |
| Other comprehensive income, before tax, exchange differences on translation of foreign operations |
619,000,000
GBP
|
— | — | — | — | — | — | — |
241,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
382,000,000
GBP
|
— |
| Cash flow hedges [abstract] | ||||||||||||||||||||||||
| Gains (losses) on cash flow hedges, before tax |
187,000,000
GBP
|
187,000,000
GBP
|
— | — | — | — | — |
187,000,000
GBP
|
2,973,000,000
GBP
|
— | — |
2,973,000,000
GBP
|
— | — |
2,973,000,000
GBP
|
— | — | — |
687,000,000
GBP
|
687,000,000
GBP
|
— | — |
687,000,000
GBP
|
— |
| Other comprehensive income, before tax, cash flow hedges |
1,208,000,000
GBP
|
— | — | — | — | — | — | — |
3,277,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
848,000,000
GBP
|
— |
| Hedges of net investment in foreign operations [abstract] | ||||||||||||||||||||||||
| Gains (losses) on hedges of net investments in foreign operations, before tax |
107,000,000
GBP
|
107,000,000
GBP
|
— | — |
107,000,000
GBP
|
— | — | — |
266,000,000
GBP
|
— | — | — | — | — |
266,000,000
GBP
|
266,000,000
GBP
|
— | — | — |
88,000,000
GBP
|
88,000,000
GBP
|
— |
88,000,000
GBP
|
— |
| Financial assets measured at fair value through other comprehensive income [abstract] | ||||||||||||||||||||||||
| Other comprehensive income, before tax, financial assets measured at fair value through other comprehensive income |
49,000,000
GBP
|
— | — | — | — | — | — | — |
457,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
100,000,000
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 |
79,000,000
GBP
|
— | — | — | — | — | — | — |
187,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
164,000,000
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 |
361,000,000
GBP
|
— | — | — | — | — | — | — |
1,067,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
213,000,000
GBP
|
— |
| Other comprehensive income |
54,000,000
GBP
|
— | — | — | — | — | — | — |
2,970,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
1,638,000,000
GBP
|
— |
| Comprehensive income |
4,686,000,000
GBP
|
4,690,000,000
GBP
|
4,000,000
GBP
|
4,402,000,000
GBP
|
637,000,000
GBP
|
-
GBP
|
53,000,000
GBP
|
872,000,000
GBP
|
625,000,000
GBP
|
3,093,000,000
GBP
|
6,000,000
GBP
|
2,376,000,000
GBP
|
-
GBP
|
371,000,000
GBP
|
619,000,000
GBP
|
273,000,000
GBP
|
48,000,000
GBP
|
-
GBP
|
624,000,000
GBP
|
1,626,000,000
GBP
|
403,000,000
GBP
|
91,000,000
GBP
|
1,674,000,000
GBP
|
2,744,000,000
GBP
|
| Comprehensive income attributable to [abstract] | ||||||||||||||||||||||||
| Comprehensive income, attributable to non-controlling interests |
4,000,000
GBP
|
— | — | — | — | — | — | — |
6,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |
48,000,000
GBP
|
— |