Statement Of Financial Position [Abstract]
| Concept |
As at 2024-01-31 |
As at 2024-01-31 |
As at 2024-01-31 |
As at 2024-01-31 |
As at 2024-01-31 |
As at 2024-01-31 |
As at 2024-01-31 |
As at 2023-01-31 |
As at 2023-01-31 |
As at 2023-01-31 |
As at 2023-01-31 |
As at 2023-01-31 |
As at 2023-01-31 |
As at 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 financial position [abstract] | |||||||||||||||||||||
| Assets [abstract] | |||||||||||||||||||||
| Property, plant and equipment | — | — | — | — | — |
3,206,000,000
GBP
|
— | — |
3,205,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Right-of-use assets | — | — | — | — | — |
1,88 1
GBP
|
— | — |
1,947,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Investment property | — | — | — | — | — |
27,000,000
GBP
|
— | — |
30,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Goodwill | — | — | — | — | — |
2,398,000,000
GBP
|
— | — |
2,408,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Intangible assets other than goodwill | — | — | — | — | — |
368,000,000
GBP
|
— | — |
371,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Investments accounted for using equity method | — | — | — | — | — |
19,000,000
GBP
|
— | — |
30,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Deferred tax assets | — | — | — | — | — |
10,000,000
GBP
|
— | — |
16,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Cash and cash equivalents | — | — | — | — | — |
360,000,000
GBP
|
— | — |
286,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Assets | — | — | — | — | — |
1 1,90 0
GBP
|
— | — |
12,103,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Equity and liabilities [abstract] | |||||||||||||||||||||
| Equity [abstract] | |||||||||||||||||||||
| Issued capital | — | — | — | — | — |
294,000,000
GBP
|
— | — |
305,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Retained earnings | — | — | — | — | — |
3,7 41
GBP
|
— | — |
3,796,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Share premium | — | — | — | — | — |
2,228,000,000
GBP
|
— | — |
2,228,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Treasury shares | — | — | — | — | — |
31,000,000
GBP
|
— | — |
22,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Other reserves | — | — | — | — | — |
290,000,000
GBP
|
— | — |
285,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| 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
|
6,778,000,000
GBP
|
46,000,000
GBP
|
196,000,000
GBP
|
| Liabilities [abstract] | |||||||||||||||||||||
| Deferred tax liabilities | — | — | — | — | — |
207,000,000
GBP
|
— | — |
205,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Liabilities | — | — | — | — | — |
5,296,000,000
GBP
|
— | — |
5,44 0
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |