Statement Of Changes In Equity [Abstract]
| Concept |
2023-02-01 to 2024-01-31 |
As at 2024-01-31 |
2023-02-01 to 2024-01-31 |
As at 2024-01-31 |
As at 2024-01-31 |
2023-02-01 to 2024-01-31 |
2023-02-01 to 2024-01-31 |
As at 2024-01-31 |
As at 2024-01-31 |
As at 2024-01-31 |
As at 2024-01-31 |
2023-02-01 to 2024-01-31 |
2023-02-01 to 2024-01-31 |
2023-02-01 to 2024-01-31 |
2023-02-01 to 2024-01-31 |
2023-02-01 to 2024-01-31 |
As at 2023-01-31 |
2022-02-01 to 2023-01-31 |
As at 2023-01-31 |
As at 2023-01-31 |
2022-02-01 to 2023-01-31 |
As at 2023-01-31 |
2022-02-01 to 2023-01-31 |
As at 2023-01-31 |
As at 2023-01-31 |
2022-02-01 to 2023-01-31 |
2022-02-01 to 2023-01-31 |
2022-02-01 to 2023-01-31 |
As at 2023-01-31 |
2022-02-01 to 2023-01-31 |
2022-02-01 to 2023-01-31 |
2022-02-01 to 2023-01-31 |
As at 2022-01-31 |
As at 2022-01-31 |
As at 2022-01-31 |
As at 2022-01-31 |
As at 2022-01-31 |
As at 2022-01-31 |
As at 2022-01-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | |||||||||||||||||||||||||||||||||||||||
| Statement of changes in equity [line items] | |||||||||||||||||||||||||||||||||||||||
| Equity | — |
290,000,000
GBP
|
— |
82,000,000
GBP
|
31,000,000
GBP
|
— | — |
2,228,000,000
GBP
|
294,000,000
GBP
|
6,604,000,000
GBP
|
3,7 41
GBP
|
— | — | — | — | — |
71,000,000
GBP
|
— |
6,663,000,000
GBP
|
285,000,000
GBP
|
— |
22,000,000
GBP
|
— |
30 5
GBP
|
2,228,000,000
GBP
|
— | — | — |
3,7 96
GBP
|
— | — | — |
50,000,000
GBP
|
325,000,000
GBP
|
2,228,000,000
GBP
|
4, 025
GBP
|
46,000,000
GBP
|
6,778,000,000
GBP
|
196,000,000
GBP
|
| Changes in equity [abstract] | |||||||||||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | |||||||||||||||||||||||||||||||||||||||
| Profit (loss) |
–
GBP
|
— |
–
GBP
|
— | — |
–
GBP
|
345,000,000
GBP
|
— | — | — | — |
345,000,000
GBP
|
–
GBP
|
–
GBP
|
70,000,000
GBP
|
415,000,000
GBP
|
— |
–
GBP
|
— | — |
471,000,000
GBP
|
— |
–
GBP
|
— | — |
–
GBP
|
471,000,000
GBP
|
–
GBP
|
— |
118,000,000
GBP
|
589,000,000
GBP
|
–
GBP
|
— | — | — | — | — | — | — |
| Other comprehensive income |
–
GBP
|
— |
22,000,000
GBP
|
— | — |
–
GBP
|
20,000,000
GBP
|
— | — | — | — |
42,000,000
GBP
|
–
GBP
|
–
GBP
|
— | — | — |
181,000,000
GBP
|
— | — |
18 1
GBP
|
— |
–
GBP
|
— | — |
–
GBP
|
–
GBP
|
–
GBP
|
— | — | — |
–
GBP
|
— | — | — | — | — | — | — |
| Comprehensive income |
–
GBP
|
— |
22,000,000
GBP
|
— | — |
–
GBP
|
325,000,000
GBP
|
— | — | — | — |
303,000,000
GBP
|
–
GBP
|
–
GBP
|
— | — | — |
181,000,000
GBP
|
— | — |
2 90
GBP
|
— |
–
GBP
|
— | — |
–
GBP
|
471,000,000
GBP
|
–
GBP
|
— | — | — |
–
GBP
|
— | — | — | — | — | — | — |
| Dividends recognised as distributions to owners |
–
GBP
|
— |
–
GBP
|
— | — |
–
GBP
|
237,000,000
GBP
|
— | — | — | — |
237,000,000
GBP
|
–
GBP
|
–
GBP
|
— | — | — |
–
GBP
|
— | — |
2 46
GBP
|
— |
–
GBP
|
— | — |
–
GBP
|
2 46
GBP
|
–
GBP
|
— | — | — |
–
GBP
|
— | — | — | — | — | — | — |
| Increase (decrease) through share-based payment transactions, equity |
–
GBP
|
— |
–
GBP
|
— | — |
–
GBP
|
22,000,000
GBP
|
— | — | — | — |
22,000,000
GBP
|
–
GBP
|
–
GBP
|
— | — | — |
–
GBP
|
— | — |
19,000,000
GBP
|
— |
–
GBP
|
— | — |
–
GBP
|
19,000,000
GBP
|
–
GBP
|
— | — | — |
–
GBP
|
— | — | — | — | — | — | — |