Statement Of Changes In Equity [Abstract]
| Concept |
2021-01-01 to 2021-12-31 |
As at 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 |
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 |
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 |
2020-01-01 to 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 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
As at 2020-12-31 |
2020-01-01 to 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
As at 2020-12-31 |
2020-01-01 to 2020-12-31 |
As at 2019-12-31 |
2019-01-01 to 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
2019-01-01 to 2019-12-31 |
As at 2019-12-31 |
2019-01-01 to 2019-12-31 |
2019-01-01 to 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
2019-01-01 to 2019-12-31 |
2019-01-01 to 2019-12-31 |
2019-01-01 to 2019-12-31 |
As at 2019-12-31 |
2019-01-01 to 2019-12-31 |
As at 2019-12-31 |
As at 2018-12-31 |
As at 2018-12-31 |
As at 2018-12-31 |
As at 2018-12-31 |
As at 2018-12-31 |
As at 2018-12-31 |
As at 2018-12-31 |
As at 2018-12-31 |
As at 2018-12-31 |
As at 2018-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Statement of changes in equity [line items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Equity | — |
5,053,000,000
GBP
|
— |
2,191,000,000
GBP
|
— |
16,102,000,000
GBP
|
107,000,000
GBP
|
25,000,000
GBP
|
— | — |
16,102,000,000
GBP
|
5,620,000,000
GBP
|
—
GBP
|
1,000,000
GBP
|
3,105,000,000
GBP
|
— | — | — | — |
4,348,000,000
GBP
|
162,000,000
GBP
|
481,000,000
GBP
|
15,774,000,000
GBP
|
3,105,000,000
GBP
|
— | — |
2,191,000,000
GBP
|
— |
1,000,000
GBP
|
5,620,000,000
GBP
|
15,936,000,000
GBP
|
— | — |
28,000,000
GBP
|
— |
15,857,000,000
GBP
|
— |
2,191,000,000
GBP
|
160,000,000
GBP
|
— |
1,000,000
GBP
|
— | — |
5,620,000,000
GBP
|
16,017,000,000
GBP
|
4,546,000,000
GBP
|
23,000,000
GBP
|
— | — | — |
371,000,000
GBP
|
— |
3,105,000,000
GBP
|
5,000,000
GBP
|
5,620,000,000
GBP
|
15,758,000,000
GBP
|
151,000,000
GBP
|
15,909,000,000
GBP
|
1,991,000,000
GBP
|
23,000,000
GBP
|
256,000,000
GBP
|
3,119,000,000
GBP
|
4,744,000,000
GBP
|
| Changes in equity [abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Profit (loss) |
19,000,000
GBP
|
— | — | — |
1,365,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
1,384,000,000
GBP
|
1,365,000,000
GBP
|
471,000,000
GBP
|
— | — | — | — | — |
452,000,000
GBP
|
— | — | — | — | — | — | — |
19,000,000
GBP
|
— |
452,000,000
GBP
|
— | — | — | — |
714,000,000
GBP
|
— |
714,000,000
GBP
|
19,000,000
GBP
|
— | — | — | — |
733,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Other comprehensive income | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
468,000,000
GBP
|
— |
260,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
338,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Comprehensive income |
19,000,000
GBP
|
— |
374,000,000
GBP
|
— |
1,833,000,000
GBP
|
— | — | — |
—
GBP
|
3,000,000
GBP
|
— | — | — | — | — | — |
1,852,000,000
GBP
|
2,210,000,000
GBP
|
211,000,000
GBP
|
— | — | — | — | — |
79,000,000
GBP
|
5,000,000
GBP
|
— |
110,000,000
GBP
|
— | — | — |
—
GBP
|
17,000,000
GBP
|
— |
194,000,000
GBP
|
— |
4,000,000
GBP
|
— | — |
374,000,000
GBP
|
— |
263,000,000
GBP
|
21,000,000
GBP
|
— | — | — | — |
395,000,000
GBP
|
—
GBP
|
— | — |
115,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Issue of equity | — | — | — | — |
210,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
210,000,000
GBP
|
210,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
500,000,000
GBP
|
— | — | — | — | — | — | — |
500,000,000
GBP
|
— |
500,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — |