Statement Of Changes In Equity [Abstract]
| Concept |
2023-01-01 to 2023-12-31 |
As at 2023-12-31 |
2023-01-01 to 2023-12-31 |
2023-01-01 to 2023-12-31 |
As at 2023-12-31 |
2023-01-01 to 2023-12-31 |
As at 2023-12-31 |
2023-01-01 to 2023-12-31 |
2023-01-01 to 2023-12-31 |
2023-01-01 to 2023-12-31 |
2023-01-01 to 2023-12-31 |
As at 2023-12-31 |
As at 2023-12-31 |
2023-01-01 to 2023-12-31 |
As at 2023-12-31 |
As at 2023-12-31 |
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 |
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 |
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 |
As at 2021-12-31 |
As at 2021-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | |||||||||||||||||||||||||||||||||||||||
| Statement of changes in equity [line items] | |||||||||||||||||||||||||||||||||||||||
| Equity | — |
10 ,72 3
GBP
|
— | — |
2 ,822
GBP
|
— |
6,403,000,000
GBP
|
— | — | — | — |
16 4
GBP
|
1, 253
GBP
|
— |
81,000,000
GBP
|
10,559,000,000
GBP
|
11, 4 0 0
GBP
|
— | — | — | — | — |
6 , 9 51
GBP
|
18 5
GBP
|
1, 2 5 2
GBP
|
2,93 0
GBP
|
82,000,000
GBP
|
11 , 2 1 5
GBP
|
— | — | — | — |
212,000,000
GBP
|
5,8 87
GBP
|
7, 6 6 8
GBP
|
7, 4 3 6
GBP
|
1, 2 5 2
GBP
|
232,000,000
GBP
|
85,000,000
GBP
|
| Changes in equity [abstract] | |||||||||||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | |||||||||||||||||||||||||||||||||||||||
| Profit (loss) |
1,9 4 0
GBP
|
— |
1,8 57
GBP
|
–
GBP
|
— |
83,000,000
GBP
|
— |
1, 85 7
GBP
|
–
GBP
|
–
GBP
|
1, 9 4 0
GBP
|
— | — |
–
GBP
|
— | — | — |
–
GBP
|
–
GBP
|
1, 6 74
GBP
|
1, 5 91
GBP
|
83,000,000
GBP
|
— | — | — | — | — | — |
–
GBP
|
1 , 6 74
GBP
|
1, 5 91
GBP
|
–
GBP
|
— | — | — | — | — | — | — |
| Other comprehensive income |
1, 2 0 9
GBP
|
— |
1 ,1 9 3
GBP
|
5 11
GBP
|
— |
1 6
GBP
|
— |
6 82
GBP
|
–
GBP
|
51 9
GBP
|
6 90
GBP
|
— | — |
–
GBP
|
— | — | — |
–
GBP
|
1, 0 5 3
GBP
|
3,6 8 4
GBP
|
2,59 5
GBP
|
36,000,000
GBP
|
— | — | — | — | — | — |
1, 0 74
GBP
|
2 , 61 0
GBP
|
3, 6 4 8
GBP
|
–
GBP
|
— | — | — | — | — | — | — |
| Comprehensive income |
731,000,000
GBP
|
— |
664,000,000
GBP
|
511,000,000
GBP
|
— |
67,000,000
GBP
|
— |
1 ,17 5
GBP
|
–
GBP
|
519,000,000
GBP
|
1, 2 50
GBP
|
— | — |
–
GBP
|
— | — | — |
–
GBP
|
1, 0 5 3
GBP
|
5, 358
GBP
|
4 ,1 8 6
GBP
|
119,000,000
GBP
|
— | — | — | — | — | — |
1, 0 74
GBP
|
4, 28 4
GBP
|
5, 239
GBP
|
–
GBP
|
— | — | — | — | — | — | — |
| Dividends recognised as distributions to owners |
9 45
GBP
|
— |
857,000,000
GBP
|
–
GBP
|
— |
8 8
GBP
|
— |
85 7
GBP
|
–
GBP
|
— | — | — | — |
–
GBP
|
— | — | — |
–
GBP
|
–
GBP
|
9 68
GBP
|
8 02
GBP
|
16 6
GBP
|
— | — | — | — | — | — | — | — |
8 02
GBP
|
–
GBP
|
— | — | — | — | — | — | — |
| Increase (decrease) through treasury share transactions, equity |
558,000,000
GBP
|
— |
558,000,000
GBP
|
1,000,000
GBP
|
— |
–
GBP
|
— |
558,000,000
GBP
|
–
GBP
|
— | — | — | — |
1,000,000
GBP
|
— | — | — |
3,000,000
GBP
|
3,000,000
GBP
|
793,000,000
GBP
|
793,000,000
GBP
|
–
GBP
|
— | — | — | — | — | — | — | — |
793,000,000
GBP
|
–
GBP
|
— | — | — | — | — | — | — |
| Increase (decrease) through share-based payment transactions, equity |
13 2
GBP
|
— |
13 2
GBP
|
–
GBP
|
— |
–
GBP
|
— |
13 2
GBP
|
–
GBP
|
— | — | — | — |
–
GBP
|
— | — | — |
–
GBP
|
–
GBP
|
12 7
GBP
|
12 7
GBP
|
–
GBP
|
— | — | — | — | — | — | — | — |
127,000,000
GBP
|
–
GBP
|
— | — | — | — | — | — | — |