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 |
As at 2022-12-31 |
As at 2022-12-31 |
As at 2022-12-31 |
2022-01-01 to 2022-12-31 |
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 |
2022-01-01 to 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 |
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 |
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 |
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 |
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 |
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 |
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 |
As at 2020-12-31 |
As at 2020-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Statement of changes in equity [line items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Equity |
12,895,000,000
GBP
|
— | — | — | — | — |
130,000,000
GBP
|
200,000,000
GBP
|
924,000,000
GBP
|
— |
496,000,000
GBP
|
— | — |
10,342,000,000
GBP
|
310,000,000
GBP
|
327,000,000
GBP
|
85,000,000
GBP
|
— |
511,000,000
GBP
|
12,585,000,000
GBP
|
— | — | — | — | — | — | — |
51,000,000
GBP
|
7,556,000,000
GBP
|
66,000,000
GBP
|
— | — | — |
19,454,000,000
GBP
|
— |
941,000,000
GBP
|
200,000,000
GBP
|
10,308,000,000
GBP
|
—
GBP
|
— | — | — | — | — | — | — | — |
19,202,000,000
GBP
|
252,000,000
GBP
|
314,000,000
GBP
|
— | — |
7,468,000,000
GBP
|
1,006,000,000
GBP
|
19,554,000,000
GBP
|
6,000,000
GBP
|
862,000,000
GBP
|
212,000,000
GBP
|
10,260,000,000
GBP
|
20,560,000,000
GBP
|
200,000,000
GBP
|
—
GBP
|
982,000,000
GBP
|
| Changes in equity [abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Profit (loss) | — | — | — |
1,139,000,000
GBP
|
1,160,000,000
GBP
|
21,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
1,160,000,000
GBP
|
— | — |
70,000,000
GBP
|
— | — | — | — | — |
1,966,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
2,036,000,000
GBP
|
1,966,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Other comprehensive income | — | — | — |
1,017,000,000
GBP
|
— | — | — | — | — | — | — |
—
GBP
|
— | — | — | — | — |
1,017,000,000
GBP
|
— | — |
76,000,000
GBP
|
8,000,000
GBP
|
197,000,000
GBP
|
— |
1,130,000,000
GBP
|
1,009,000,000
GBP
|
— | — | — | — | — | — | — | — |
241,000,000
GBP
|
— | — | — | — | — |
377,000,000
GBP
|
23,000,000
GBP
|
100,000,000
GBP
|
— |
33,000,000
GBP
|
344,000,000
GBP
|
221,000,000
GBP
|
— | — | — |
136,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Comprehensive income | — | — | — |
2,156,000,000
GBP
|
— | — | — | — | — | — | — |
—
GBP
|
— | — | — | — | — |
2,156,000,000
GBP
|
— | — |
76,000,000
GBP
|
13,000,000
GBP
|
197,000,000
GBP
|
— |
2,290,000,000
GBP
|
2,169,000,000
GBP
|
— | — | — | — | — | — | — | — |
1,459,000,000
GBP
|
— | — | — | — | — |
1,659,000,000
GBP
|
23,000,000
GBP
|
1,866,000,000
GBP
|
— |
37,000,000
GBP
|
1,622,000,000
GBP
|
221,000,000
GBP
|
— | — | — |
200,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Dividends recognised as distributions to owners | — | — | — |
862,000,000
GBP
|
862,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
862,000,000
GBP
|
— | — | — | — | — | — | — | — |
1,127,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
1,127,000,000
GBP
|
1,127,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Increase (decrease) through other changes, equity | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
663,000,000
GBP
|
— | — | — | — | — | — |
42,000,000
GBP
|
— | — | — |
42,000,000
GBP
|
— | — | — | — | — | — |
663,000,000
GBP
|
663,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Increase (decrease) through changes in ownership interests in subsidiaries that do not result in loss of control, equity | — | — | — |
66,000,000
GBP
|
— |
66,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
9,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
9,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Increase (decrease) through share-based payment transactions, equity | — |
34,000,000
GBP
|
46,000,000
GBP
|
54,000,000
GBP
|
9,000,000
GBP
|
— | — | — | — |
2,000,000
GBP
|
— | — |
15,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
54,000,000
GBP
|
— | — | — | — | — | — |
45,000,000
GBP
|
29,000,000
GBP
|
64,000,000
GBP
|
— | — | — | — | — | — |
1,000,000
GBP
|
— | — | — |
6,000,000
GBP
|
— | — | — | — | — | — |
64,000,000
GBP
|
3,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |