Statement Of Changes In Equity [Abstract]
| Concept |
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 |
2021-01-01 to 2021-12-31 |
As at 2021-12-31 |
2021-01-01 to 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
As at 2021-12-31 |
2021-01-01 to 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
2021-01-01 to 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | |||||||||||||||||||||||||||||||||||||||||||||
| Statement of changes in equity [line items] | |||||||||||||||||||||||||||||||||||||||||||||
| Equity |
2, 830
GBP
|
— | — | — | — | — | — |
11 , 6 1 3
GBP
|
48,000,000
GBP
|
370,000,000
GBP
|
14 ,02 3
GBP
|
47,000,000
GBP
|
119,000,000
GBP
|
2,782,000,000
GBP
|
7 0
GBP
|
— | — | — | — |
1,000,000
GBP
|
— |
93,000,000
GBP
|
16, 550
GBP
|
1 1 , 6 6 0
GBP
|
— | — | — |
5 ,345
GBP
|
— |
5, 296
GBP
|
3 70
GBP
|
— |
130,000,000
GBP
|
49,000,000
GBP
|
— | — |
117,000,000
GBP
|
16, 85 3
GBP
|
8,000,000
GBP
|
5,57 7
GBP
|
13 0
GBP
|
1,000,000
GBP
|
11 , 6 5 8
GBP
|
370,000,000
GBP
|
5,585,000,000
GBP
|
| Changes in equity [abstract] | |||||||||||||||||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | |||||||||||||||||||||||||||||||||||||||||||||
| Profit (loss) | — |
—
GBP
|
—
GBP
|
—
GBP
|
1 , 6 1 9
GBP
|
1,632,000,000
GBP
|
13,000,000
GBP
|
— | — | — | — | — | — | — | — |
1,632,000,000
GBP
|
—
GBP
|
—
GBP
|
9,000,000
GBP
|
— |
—
GBP
|
— | — | — |
—
GBP
|
—
GBP
|
83,000,000
GBP
|
— |
—
GBP
|
— | — |
—
GBP
|
— | — |
92,000,000
GBP
|
83,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Other comprehensive income | — |
—
GBP
|
—
GBP
|
20,000,000
GBP
|
44,000,000
GBP
|
24,000,000
GBP
|
—
GBP
|
— | — | — | — | — | — | — | — |
44,000,000
GBP
|
—
GBP
|
—
GBP
|
—
GBP
|
— |
—
GBP
|
— | — | — |
—
GBP
|
13,000,000
GBP
|
37,000,000
GBP
|
— |
—
GBP
|
— | — |
—
GBP
|
— | — |
37,000,000
GBP
|
50,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
| Comprehensive income | — |
—
GBP
|
—
GBP
|
20,000,000
GBP
|
1 , 5 7 5
GBP
|
1 , 6 0 8
GBP
|
13,000,000
GBP
|
— | — | — | — | — | — | — | — |
1,588,000,000
GBP
|
—
GBP
|
—
GBP
|
9,000,000
GBP
|
— |
—
GBP
|
— | — | — |
—
GBP
|
1 3
GBP
|
120,000,000
GBP
|
— |
—
GBP
|
— | — |
—
GBP
|
— | — |
129,000,000
GBP
|
13 3
GBP
|
— | — | — | — | — | — | — | — | — |
| Increase (decrease) through other changes, equity | — |
1,000,000
GBP
|
—
GBP
|
—
GBP
|
1,000,000
GBP
|
—
GBP
|
—
GBP
|
— | — | — | — | — | — | — | — |
1,000,000
GBP
|
—
GBP
|
—
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Increase (decrease) in equity | — |
4 6
GBP
|
11,000,000
GBP
|
47,000,000
GBP
|
2 , 51 5
GBP
|
2 , 52 7
GBP
|
1,000,000
GBP
|
— | — | — | — | — | — | — | — |
2 , 51 4
GBP
|
—
GBP
|
23,000,000
GBP
|
41,000,000
GBP
|
— |
24,000,000
GBP
|
— | — | — |
—
GBP
|
2,000,000
GBP
|
2 8 1
GBP
|
— |
—
GBP
|
— | — |
—
GBP
|
— | — |
24 0
GBP
|
3 0 3
GBP
|
— | — | — | — | — | — | — | — | — |