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 |
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 |
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 |
2021-01-01 to 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | |||||||||||||||||||||||||||||||||||||||
| Statement of changes in equity [line items] | |||||||||||||||||||||||||||||||||||||||
| Equity |
1 1 ,400
GBP
|
— | — | — | — | — |
6, 9 51
GBP
|
185,000,000
GBP
|
1,252,000,000
GBP
|
2 ,930
GBP
|
82,000,000
GBP
|
11 , 2 1 5
GBP
|
— | — | — | — | — |
212,000,000
GBP
|
5,8 87
GBP
|
— | — |
7, 6 6 8
GBP
|
— | — | — |
7, 43 6
GBP
|
1, 25 2
GBP
|
— |
232,000,000
GBP
|
85,000,000
GBP
|
— | — |
2 ,6 1 6
GBP
|
278,000,000
GBP
|
4,6 43
GBP
|
87,000,000
GBP
|
5,92 3
GBP
|
1, 24 9
GBP
|
4 , 921
GBP
|
| Changes in equity [abstract] | |||||||||||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | |||||||||||||||||||||||||||||||||||||||
| Profit (loss) | — |
–
GBP
|
–
GBP
|
1, 6 74
GBP
|
1, 5 91
GBP
|
83,000,000
GBP
|
— | — | — | — | — | — |
–
GBP
|
1, 674
GBP
|
1, 5 91
GBP
|
–
GBP
|
15 4
GBP
|
— | — |
–
GBP
|
1, 7 5 8
GBP
|
— |
–
GBP
|
–
GBP
|
1, 9 12
GBP
|
— | — |
–
GBP
|
— | — |
1, 9 12
GBP
|
1, 75 8
GBP
|
— | — | — | — | — | — | — |
| Other comprehensive income | — |
–
GBP
|
1, 0 53
GBP
|
3,684,000,000
GBP
|
2, 595
GBP
|
36,000,000
GBP
|
— | — | — | — | — | — |
1, 0 74
GBP
|
2 , 61 0
GBP
|
3, 6 48
GBP
|
–
GBP
|
2,000,000
GBP
|
— | — |
3,000,000
GBP
|
2 ,12 1
GBP
|
— |
–
GBP
|
2,000,000
GBP
|
2 ,12 1
GBP
|
— | — |
–
GBP
|
— | — |
2 ,12 3
GBP
|
2 ,12 4
GBP
|
— | — | — | — | — | — | — |
| Comprehensive income | — |
–
GBP
|
1, 0 53
GBP
|
5, 358
GBP
|
4 ,18 6
GBP
|
11 9
GBP
|
— | — | — | — | — | — |
1, 0 74
GBP
|
4,28 4
GBP
|
5,239,000,000
GBP
|
–
GBP
|
15 6
GBP
|
— | — |
3,000,000
GBP
|
3, 879
GBP
|
— |
–
GBP
|
2,000,000
GBP
|
4 ,033
GBP
|
— | — |
–
GBP
|
— | — |
4,035,000,000
GBP
|
3,8 8 2
GBP
|
— | — | — | — | — | — | — |
| Dividends recognised as distributions to owners | — |
–
GBP
|
–
GBP
|
96 8
GBP
|
8 02
GBP
|
16 6
GBP
|
— | — | — | — | — | — | — | — |
8 02
GBP
|
–
GBP
|
20 2
GBP
|
— | — |
–
GBP
|
777,000,000
GBP
|
— |
–
GBP
|
— | — | — | — |
–
GBP
|
— | — |
979,000,000
GBP
|
777,000,000
GBP
|
— | — | — | — | — | — | — |
| Increase (decrease) through treasury share transactions, equity | — |
3,000,000
GBP
|
3,000,000
GBP
|
793,000,000
GBP
|
793,000,000
GBP
|
–
GBP
|
— | — | — | — | — | — | — | — |
7 93
GBP
|
–
GBP
|
–
GBP
|
— | — |
2,000,000
GBP
|
3 71
GBP
|
— |
–
GBP
|
— | — | — | — |
2,000,000
GBP
|
— | — |
3 71
GBP
|
3 71
GBP
|
— | — | — | — | — | — | — |
| Increase (decrease) through share-based payment transactions, equity | — |
–
GBP
|
–
GBP
|
12 7
GBP
|
12 7
GBP
|
–
GBP
|
— | — | — | — | — | — | — | — |
12 7
GBP
|
–
GBP
|
–
GBP
|
— | — |
–
GBP
|
94,000,000
GBP
|
— |
–
GBP
|
— | — | — | — |
–
GBP
|
— | — |
94,000,000
GBP
|
94,000,000
GBP
|
— | — | — | — | — | — | — |