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, before tax [abstract] | |||||||||||||||||||||||
| Other comprehensive income, before tax, gains (losses) from investments in equity instruments |
1,000,000
GBP
|
— | — | — | — | — | — | — |
—
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
2,000,000
GBP
|
— |
| Other comprehensive income, before tax, gains (losses) on remeasurements of defined benefit plans |
20,000,000
GBP
|
— | — | — | — | — | — | — |
56,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
61,000,000
GBP
|
— |
| Other comprehensive income, before tax, change in fair value of financial liability attributable to change in credit risk of liability |
179,000,000
GBP
|
— | — | — | — | — | — | — |
462,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
3,000,000
GBP
|
— |
| Components of other comprehensive income that will be reclassified to profit or loss, before tax [abstract] | |||||||||||||||||||||||
| Cash flow hedges [abstract] | |||||||||||||||||||||||
| Gains (losses) on cash flow hedges, before tax |
614,000,000
GBP
|
— | — | — | — | — | — | — |
1,418,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
40,000,000
GBP
|
— |
| Reclassification adjustments on cash flow hedges, before tax |
301,000,000
GBP
|
— | — | — | — | — | — | — |
127,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
202,000,000
GBP
|
— |
| Financial assets measured at fair value through other comprehensive income [abstract] | |||||||||||||||||||||||
| Gains (losses) on financial assets measured at fair value through other comprehensive income, before tax |
495,000,000
GBP
|
— | — | — | — | — | — | — |
2,631,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
247,000,000
GBP
|
— |
| Reclassification adjustments on financial assets measured at fair value through other comprehensive income, before tax |
93,000,000
GBP
|
— | — | — | — | — | — | — |
59,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
63,000,000
GBP
|
— |
| Amounts removed from equity and adjusted against fair value of financial assets on reclassification out of fair value through other comprehensive income measurement category, before tax |
2,000,000
GBP
|
— | — | — | — | — | — | — |
6,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
5,000,000
GBP
|
— |
| Insurance finance income (expenses) from insurance contracts issued excluded from profit or loss [abstract] | |||||||||||||||||||||||
| Other comprehensive income, before tax, insurance finance income (expenses) from insurance contracts issued excluded from profit or loss that will be reclassified to profit or loss |
402,000,000
GBP
|
— | — | — | — | — | — | — |
1,898,000,000
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 investments in equity instruments included in other comprehensive income |
—
GBP
|
— | — | — | — | — | — | — |
—
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
—
GBP
|
— |
| Income tax relating to remeasurements of defined benefit plans included in other comprehensive income |
18,000,000
GBP
|
— | — | — | — | — | — | — |
18,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
17,000,000
GBP
|
— |
| Income tax relating to changes in fair value of financial liability attributable to change in credit risk of liability included in other comprehensive income |
47,000,000
GBP
|
— | — | — | — | — | — | — |
133,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
1,000,000
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 |
252,000,000
GBP
|
— | — | — | — | — | — | — |
348,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
77,000,000
GBP
|
— |
| Income tax relating to financial assets measured at fair value through other comprehensive income included in other comprehensive income |
147,000,000
GBP
|
— | — | — | — | — | — | — |
680,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
78,000,000
GBP
|
— |
| Income tax relating to insurance finance income (expenses) from insurance contracts issued included in other comprehensive income that will be reclassified to profit or loss |
104,000,000
GBP
|
— | — | — | — | — | — | — |
490,000,000
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
|
— |