Statement Of Changes In Equity [Abstract]
| Concept |
2023-01-01 to 2023-12-31 |
As at 2023-12-31 |
As at 2023-12-31 |
2023-01-01 to 2023-12-31 |
As at 2023-12-31 |
As at 2023-12-31 |
As at 2023-12-31 |
As at 2023-12-31 |
As at 2023-12-31 |
2023-01-01 to 2023-12-31 |
As at 2023-12-31 |
As at 2023-12-31 |
As at 2022-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
2022-01-01 to 2022-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | |||||||||||||||||||||||||||||||||||||
| Statement of changes in equity [line items] | |||||||||||||||||||||||||||||||||||||
| Equity | — |
21,430,000,000
GBP
|
14,871,000,000
GBP
|
— |
35,000,000
GBP
|
28,000,000
GBP
|
21,395,000,000
GBP
|
600,000,000
GBP
|
41,000,000
GBP
|
— |
2,518,000,000
GBP
|
104,000,000
GBP
|
20,076,000,000
GBP
|
— | — |
10,000,000
GBP
|
2,225,000,000
GBP
|
820,000,000
GBP
|
13,302,000,000
GBP
|
1,678,000,000
GBP
|
77,000,000
GBP
|
20,066,000,000
GBP
|
76,000,000
GBP
|
2,518,000,000
GBP
|
391,000,000
GBP
|
87,000,000
GBP
|
— |
13,507,000,000
GBP
|
820,000,000
GBP
|
2,377,000,000
GBP
|
1,000,000
GBP
|
192,000,000
GBP
|
85,000,000
GBP
|
14,000,000
GBP
|
2,225,000,000
GBP
|
10,000,000
GBP
|
1,678,000,000
GBP
|
| Changes in equity [abstract] | |||||||||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | |||||||||||||||||||||||||||||||||||||
| Profit (loss) |
3,509,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
3,689,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Other comprehensive income |
298,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
1,070,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Comprehensive income |
3,211,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
2,619,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Issue of equity | — | — | — | — | — | — | — | — | — |
-
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
500,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
| Increase (decrease) through share-based payment transactions, equity | — | — | — |
10,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
6,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |