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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of comprehensive income [abstract] | |||||||||||||||||||||||
| Profit (loss) |
1,725,000,000
GBP
|
— |
1,703,000,000
GBP
|
22,000,000
GBP
|
1,703,000,000
GBP
|
— | — | — |
553,000,000
GBP
|
563,000,000
GBP
|
10,000,000
GBP
|
— | — | — |
563,000,000
GBP
|
— |
5,000,000
GBP
|
— |
1,041,000,000
GBP
|
— | — |
1,046,000,000
GBP
|
1,041,000,000
GBP
|
| Other comprehensive income [abstract] | |||||||||||||||||||||||
| Components of other comprehensive income that will not be reclassified to profit or loss, net of tax [abstract] | |||||||||||||||||||||||
| Other comprehensive income, net of tax, gains (losses) from investments in equity instruments |
1,000,000
GBP
|
— |
1,000,000
GBP
|
— | — | — |
1,000,000
GBP
|
— |
—
GBP
|
— | — | — | — | — |
—
GBP
|
— | — | — |
2,000,000
GBP
|
— |
2,000,000
GBP
|
2,000,000
GBP
|
— |
| Other comprehensive income, net of tax, gains (losses) on remeasurements of defined benefit plans |
2,000,000
GBP
|
— |
2,000,000
GBP
|
— |
2,000,000
GBP
|
— | — | — |
38,000,000
GBP
|
38,000,000
GBP
|
— | — | — | — |
38,000,000
GBP
|
— | — | — |
44,000,000
GBP
|
— | — |
44,000,000
GBP
|
44,000,000
GBP
|
| Other comprehensive income, net of tax, change in fair value of financial liability attributable to change in credit risk of liability |
132,000,000
GBP
|
— |
132,000,000
GBP
|
— |
132,000,000
GBP
|
— | — | — |
329,000,000
GBP
|
329,000,000
GBP
|
— | — | — | — |
329,000,000
GBP
|
— | — | — |
2,000,000
GBP
|
— | — |
2,000,000
GBP
|
2,000,000
GBP
|
| Components of other comprehensive income that will be reclassified to profit or loss, net of tax [abstract] | |||||||||||||||||||||||
| Exchange differences on translation [abstract] | |||||||||||||||||||||||
| Other comprehensive income, net of tax, exchange differences on translation of foreign operations |
302,000,000
GBP
|
10,000,000
GBP
|
300,000,000
GBP
|
2,000,000
GBP
|
— |
294,000,000
GBP
|
14,000,000
GBP
|
2,000,000
GBP
|
672,000,000
GBP
|
— |
7,000,000
GBP
|
— | — | — |
665,000,000
GBP
|
665,000,000
GBP
|
8,000,000
GBP
|
— |
595,000,000
GBP
|
595,000,000
GBP
|
— |
603,000,000
GBP
|
— |
| Cash flow hedges [abstract] | |||||||||||||||||||||||
| Other comprehensive income, net of tax, cash flow hedges |
663,000,000
GBP
|
— |
663,000,000
GBP
|
— | — | — | — |
663,000,000
GBP
|
943,000,000
GBP
|
— | — |
943,000,000
GBP
|
— | — |
943,000,000
GBP
|
— | — |
165,000,000
GBP
|
165,000,000
GBP
|
— | — |
165,000,000
GBP
|
— |
| Financial assets measured at fair value through other comprehensive income [abstract] | |||||||||||||||||||||||
| Other comprehensive income, net of tax, financial assets measured at fair value through other comprehensive income |
439,000,000
GBP
|
— |
437,000,000
GBP
|
2,000,000
GBP
|
— | — |
437,000,000
GBP
|
— |
1,886,000,000
GBP
|
— |
5,000,000
GBP
|
— | — |
1,881,000,000
GBP
|
1,881,000,000
GBP
|
— |
1,000,000
GBP
|
— |
236,000,000
GBP
|
— |
236,000,000
GBP
|
237,000,000
GBP
|
— |
| Insurance finance income (expenses) from insurance contracts issued excluded from profit or loss [abstract] | |||||||||||||||||||||||
| Other comprehensive income, net of tax, insurance finance income (expenses) from insurance contracts issued excluded from profit or loss that will be reclassified to profit or loss |
298,000,000
GBP
|
298,000,000
GBP
|
298,000,000
GBP
|
— | — | — | — | — |
1,408,000,000
GBP
|
— | — | — |
1,408,000,000
GBP
|
— | — | — | — | — | — | — | — |
—
GBP
|
— |
| Other comprehensive income |
367,000,000
GBP
|
288,000,000
GBP
|
367,000,000
GBP
|
—
GBP
|
134,000,000
GBP
|
294,000,000
GBP
|
422,000,000
GBP
|
661,000,000
GBP
|
382,000,000
GBP
|
367,000,000
GBP
|
2,000,000
GBP
|
943,000,000
GBP
|
1,408,000,000
GBP
|
1,881,000,000
GBP
|
384,000,000
GBP
|
665,000,000
GBP
|
9,000,000
GBP
|
165,000,000
GBP
|
948,000,000
GBP
|
595,000,000
GBP
|
234,000,000
GBP
|
957,000,000
GBP
|
46,000,000
GBP
|
| Comprehensive income |
2,092,000,000
GBP
|
288,000,000
GBP
|
2,070,000,000
GBP
|
— |
1,569,000,000
GBP
|
294,000,000
GBP
|
422,000,000
GBP
|
661,000,000
GBP
|
935,000,000
GBP
|
196,000,000
GBP
|
12,000,000
GBP
|
943,000,000
GBP
|
1,408,000,000
GBP
|
1,881,000,000
GBP
|
947,000,000
GBP
|
665,000,000
GBP
|
4,000,000
GBP
|
165,000,000
GBP
|
93,000,000
GBP
|
595,000,000
GBP
|
234,000,000
GBP
|
89,000,000
GBP
|
1,087,000,000
GBP
|
| Comprehensive income attributable to [abstract] | |||||||||||||||||||||||
| Comprehensive income, attributable to owners of parent |
2,070,000,000
GBP
|
— | — | — | — | — | — | — |
947,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
93,000,000
GBP
|
— |
| Comprehensive income, attributable to non-controlling interests |
22,000,000
GBP
|
— | — | — | — | — | — | — |
12,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
4,000,000
GBP
|
— |