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 |
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 |
As at 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 |
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 |
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 |
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 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Statement of changes in equity [line items] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Equity |
16,457,000,000
GBP
|
— | — | — | — | — |
11,537,000,000
GBP
|
126,000,000
GBP
|
–
GBP
|
26,730,000,000
GBP
|
92,000,000
GBP
|
1,046,000,000
GBP
|
16,331,000,000
GBP
|
— | — | — | — |
37,538,000,000
GBP
|
11,632,000,000
GBP
|
— | — |
26,480,000,000
GBP
|
— |
448,000,000
GBP
|
— |
26,355,000,000
GBP
|
— |
–
GBP
|
1,000,000
GBP
|
125,000,000
GBP
|
— | — | — |
37,281,000,000
GBP
|
111,000,000
GBP
|
26,112,000,000
GBP
|
1,000,000
GBP
|
— |
482,000,000
GBP
|
11,652,000,000
GBP
|
–
GBP
|
— | — |
26,223,000,000
GBP
|
— | — | — | — |
27,321,000,000
GBP
|
91,000,000
GBP
|
1,372,000,000
GBP
|
652,000,000
GBP
|
27,412,000,000
GBP
|
20,842,000,000
GBP
|
4,454,000,000
GBP
|
1,000,000
GBP
|
| Changes in equity [abstract] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Profit (loss) | — |
–
GBP
|
–
GBP
|
1,119,000,000
GBP
|
1,060,000,000
GBP
|
59,000,000
GBP
|
— | — | — | — | — | — | — |
1,060,000,000
GBP
|
–
GBP
|
–
GBP
|
49,000,000
GBP
|
— | — |
–
GBP
|
1,390,000,000
GBP
|
— |
–
GBP
|
— |
–
GBP
|
— |
–
GBP
|
— | — | — |
1,439,000,000
GBP
|
1,390,000,000
GBP
|
1,181,000,000
GBP
|
— | — | — | — |
1,145,000,000
GBP
|
— | — | — |
–
GBP
|
–
GBP
|
— |
–
GBP
|
36,000,000
GBP
|
–
GBP
|
1,145,000,000
GBP
|
— | — | — | — | — | — | — | — |
| Other comprehensive income | — |
–
GBP
|
142,000,000
GBP
|
824,000,000
GBP
|
94,000,000
GBP
|
10,000,000
GBP
|
— | — | — | — | — | — | — |
834,000,000
GBP
|
–
GBP
|
598,000,000
GBP
|
–
GBP
|
— | — |
9,000,000
GBP
|
10,000,000
GBP
|
— |
–
GBP
|
— |
34,000,000
GBP
|
— |
–
GBP
|
— | — | — |
10,000,000
GBP
|
15,000,000
GBP
|
169,000,000
GBP
|
— | — | — | — |
–
GBP
|
— | — | — |
–
GBP
|
–
GBP
|
— |
170,000,000
GBP
|
1,000,000
GBP
|
–
GBP
|
170,000,000
GBP
|
— | — | — | — | — | — | — | — |
| Comprehensive income | — |
–
GBP
|
142,000,000
GBP
|
1,943,000,000
GBP
|
1,154,000,000
GBP
|
49,000,000
GBP
|
— | — | — | — | — | — | — |
1,894,000,000
GBP
|
–
GBP
|
598,000,000
GBP
|
49,000,000
GBP
|
— | — |
9,000,000
GBP
|
1,380,000,000
GBP
|
— |
–
GBP
|
— |
34,000,000
GBP
|
— |
–
GBP
|
— | — | — |
1,429,000,000
GBP
|
1,405,000,000
GBP
|
1,012,000,000
GBP
|
— | — | — | — |
1,145,000,000
GBP
|
— | — | — |
–
GBP
|
–
GBP
|
— |
170,000,000
GBP
|
37,000,000
GBP
|
–
GBP
|
975,000,000
GBP
|
— | — | — | — | — | — | — | — |
| Issue of equity | — |
11,543,000,000
GBP
|
–
GBP
|
22,150,000,000
GBP
|
–
GBP
|
–
GBP
|
— | — | — | — | — | — | — |
22,150,000,000
GBP
|
10,607,000,000
GBP
|
–
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
–
GBP
|
— | — | — | — |
–
GBP
|
— | — | — |
13,166,000,000
GBP
|
13,166,000,000
GBP
|
— |
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
— | — | — | — | — | — | — | — |
| Increase through other contributions by owners, equity | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
–
GBP
|
— | — |
11,000,000
GBP
|
11,000,000
GBP
|
— |
–
GBP
|
— |
–
GBP
|
— |
–
GBP
|
— | — | — |
11,000,000
GBP
|
–
GBP
|
187,000,000
GBP
|
— | — | — | — |
–
GBP
|
— | — | — |
187,000,000
GBP
|
–
GBP
|
— |
–
GBP
|
–
GBP
|
–
GBP
|
187,000,000
GBP
|
— | — | — | — | — | — | — | — |
| Increase (decrease) through changes in ownership interests in subsidiaries that do not result in loss of control, equity | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
14,000,000
GBP
|
— | — | — | — |
–
GBP
|
— | — | — |
–
GBP
|
–
GBP
|
— |
–
GBP
|
14,000,000
GBP
|
–
GBP
|
–
GBP
|
— | — | — | — | — | — | — | — |
| Increase (decrease) through share-based payment transactions, equity | — |
–
GBP
|
–
GBP
|
15,000,000
GBP
|
15,000,000
GBP
|
–
GBP
|
— | — | — | — | — | — | — |
15,000,000
GBP
|
–
GBP
|
–
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |