Statement Of Cash Flows [Abstract]
| Concept |
As at 2022-01-31 |
2021-02-01 to 2022-01-31 |
As at 2021-01-31 |
2020-02-01 to 2021-01-31 |
|---|---|---|---|---|
| Statement of cash flows [abstract] | ||||
| Cash flows from (used in) operating activities [abstract] | ||||
| Cash flows from (used in) operations | — |
1,411,000,000
GBP
|
— |
1,816,000,000
GBP
|
| Income taxes paid (refund), classified as operating activities | — |
169,000,000
GBP
|
— |
166,000,000
GBP
|
| Cash flows from (used in) operating activities | — |
1,178,000,000
GBP
|
— |
1,650,000,000
GBP
|
| Cash flows from (used in) investing activities [abstract] | ||||
| Cash flows from losing control of subsidiaries or other businesses, classified as investing activities | — |
7,000,000
GBP
|
— |
27,000,000
GBP
|
| Cash flows used in obtaining control of subsidiaries or other businesses, classified as investing activities | — |
–
GBP
|
— |
8,000,000
GBP
|
| Interest received, classified as investing activities | — |
2,000,000
GBP
|
— |
4,000,000
GBP
|
| Cash flows from (used in) investing activities | — |
385,000,000
GBP
|
— |
207,000,000
GBP
|
| Cash flows from (used in) financing activities [abstract] | ||||
| Proceeds from issuing shares | — |
5,000,000
GBP
|
— |
1,000,000
GBP
|
| Proceeds from borrowings, classified as financing activities | — |
–
GBP
|
— |
1,950,000,000
GBP
|
| Interest paid, classified as financing activities | — |
22,000,000
GBP
|
— |
26,000,000
GBP
|
| Cash flows from (used in) financing activities | — |
1,030,000,000
GBP
|
— |
562,000,000
GBP
|
| Increase (decrease) in cash and cash equivalents before effect of exchange rate changes | — |
237,000,000
GBP
|
— |
881,000,000
GBP
|
| Effect of exchange rate changes on cash and cash equivalents [abstract] | ||||
| Effect of exchange rate changes on cash and cash equivalents | — |
90,000,000
GBP
|
— |
60,000,000
GBP
|
| Cash and cash equivalents |
823,000,000
GBP
|
— |
1,142,000,000
GBP
|
— |