Statement Of Changes In Equity [Abstract]
| Concept |
2023-01-01 to 2023-12-31 |
2023-01-01 to 2023-12-31 |
As at 2023-12-31 |
2023-01-01 to 2023-12-31 |
2023-01-01 to 2023-12-31 |
As at 2023-12-31 |
2023-01-01 to 2023-12-31 |
As at 2023-12-31 |
2023-01-01 to 2023-12-31 |
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 |
2023-01-01 to 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 |
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 |
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 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
As at 2022-01-01 |
As at 2022-01-01 |
As at 2022-01-01 |
As at 2022-01-01 |
As at 2022-01-01 |
As at 2022-01-01 |
As at 2022-01-01 |
As at 2022-01-01 |
As at 2022-01-01 |
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 |
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 | — | — |
4,084,000,000
GBP
|
— | — |
15,223,000,000
GBP
|
— |
11,633,000,000
GBP
|
— | — |
43,000,000
GBP
|
379,000,000
GBP
|
— |
119,000,000
GBP
|
21,000,000
GBP
|
4,041,000,000
GBP
|
— |
26,000,000
GBP
|
4,311,000,000
GBP
|
— | — | — | — | — | — |
11,613,000,000
GBP
|
48,000,000
GBP
|
370,000,000
GBP
|
15,504,000,000
GBP
|
47,000,000
GBP
|
119,000,000
GBP
|
4,263,000,000
GBP
|
70,000,000
GBP
|
— | — | — | — |
7,215,000,000
GBP
|
18,469,000,000
GBP
|
370,000,000
GBP
|
130,000,000
GBP
|
49,000,000
GBP
|
1,000,000
GBP
|
11,660,000,000
GBP
|
7,264,000,000
GBP
|
93,000,000
GBP
|
1,000,000
GBP
|
5,345,000,000
GBP
|
—
GBP
|
1,919,000,000
GBP
|
7,264,000,000
GBP
|
—
GBP
|
1,919,000,000
GBP
|
1,919,000,000
GBP
|
—
GBP
|
370,000,000
GBP
|
11,660,000,000
GBP
|
16,550,000,000
GBP
|
5,296,000,000
GBP
|
49,000,000
GBP
|
130,000,000
GBP
|
—
GBP
|
—
GBP
|
—
GBP
|
93,000,000
GBP
|
| Changes in equity [abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Profit (loss) |
309,000,000
GBP
|
—
GBP
|
— |
297,000,000
GBP
|
—
GBP
|
— |
12,000,000
GBP
|
— |
297,000,000
GBP
|
—
GBP
|
— | — |
—
GBP
|
— | — | — |
—
GBP
|
— | — |
—
GBP
|
—
GBP
|
—
GBP
|
2,055,000,000
GBP
|
2,068,000,000
GBP
|
13,000,000
GBP
|
— | — | — | — | — | — | — | — |
2,068,000,000
GBP
|
—
GBP
|
2,055,000,000
GBP
|
—
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Other comprehensive income |
108,000,000
GBP
|
—
GBP
|
— |
104,000,000
GBP
|
8,000,000
GBP
|
— |
4,000,000
GBP
|
— |
96,000,000
GBP
|
—
GBP
|
— | — |
—
GBP
|
— | — | — |
—
GBP
|
— | — |
—
GBP
|
—
GBP
|
20,000,000
GBP
|
42,000,000
GBP
|
22,000,000
GBP
|
—
GBP
|
— | — | — | — | — | — | — | — |
42,000,000
GBP
|
—
GBP
|
42,000,000
GBP
|
—
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Comprehensive income |
201,000,000
GBP
|
—
GBP
|
— |
193,000,000
GBP
|
8,000,000
GBP
|
— |
8,000,000
GBP
|
— |
201,000,000
GBP
|
—
GBP
|
— | — |
—
GBP
|
— | — | — |
—
GBP
|
— | — |
—
GBP
|
—
GBP
|
20,000,000
GBP
|
2,013,000,000
GBP
|
2,046,000,000
GBP
|
13,000,000
GBP
|
— | — | — | — | — | — | — | — |
2,026,000,000
GBP
|
—
GBP
|
2,013,000,000
GBP
|
—
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Increase (decrease) through other changes, equity | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
—
GBP
|
1,000,000
GBP
|
—
GBP
|
1,000,000
GBP
|
—
GBP
|
—
GBP
|
— | — | — | — | — | — | — | — |
1,000,000
GBP
|
—
GBP
|
— |
—
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Increase (decrease) through share-based payment transactions, equity |
5,000,000
GBP
|
22,000,000
GBP
|
— |
5,000,000
GBP
|
—
GBP
|
— |
—
GBP
|
— |
—
GBP
|
—
GBP
|
— | — |
—
GBP
|
— | — | — |
27,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Increase (decrease) in equity |
227,000,000
GBP
|
26,000,000
GBP
|
— |
222,000,000
GBP
|
20,000,000
GBP
|
— |
5,000,000
GBP
|
— |
281,000,000
GBP
|
9,000,000
GBP
|
— | — |
—
GBP
|
— | — | — |
44,000,000
GBP
|
— | — |
11,000,000
GBP
|
46,000,000
GBP
|
47,000,000
GBP
|
2,953,000,000
GBP
|
2,965,000,000
GBP
|
1,000,000
GBP
|
— | — | — | — | — | — | — | — |
2,952,000,000
GBP
|
—
GBP
|
— |
23,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |