Statement Of Cash Flows [Abstract]
| Concept |
As at 2023-04-04 |
2022-04-05 to 2023-04-04 |
2021-04-05 to 2022-04-04 |
As at 2022-04-04 |
As at 2021-04-04 |
|---|---|---|---|---|---|
| Statement of cash flows [abstract] | |||||
| Cash flows from (used in) operating activities [abstract] | |||||
| Income taxes paid (refund), classified as operating activities | — |
558,000,000
GBP
|
378,000,000
GBP
|
— | — |
| Cash flows from (used in) operating activities | — |
455,000,000
GBP
|
13,772,000,000
GBP
|
— | — |
| Cash flows from (used in) investing activities [abstract] | |||||
| Cash flows used in obtaining control of subsidiaries or other businesses, classified as investing activities | — |
-
GBP
|
-
GBP
|
— | — |
| Proceeds from sales of property, plant and equipment, classified as investing activities | — |
21,000,000
GBP
|
20,000,000
GBP
|
— | — |
| Purchase of property, plant and equipment, classified as investing activities | — |
63,000,000
GBP
|
68,000,000
GBP
|
— | — |
| Purchase of intangible assets, classified as investing activities | — |
283,000,000
GBP
|
210,000,000
GBP
|
— | — |
| Cash flows from (used in) investing activities | — |
2,267,000,000
GBP
|
1,058,000,000
GBP
|
— | — |
| Cash flows from (used in) financing activities [abstract] | |||||
| Payments to acquire or redeem entity's shares | — |
101,000,000
GBP
|
-
GBP
|
— | — |
| Payments of lease liabilities, classified as financing activities | — |
33,000,000
GBP
|
27,000,000
GBP
|
— | — |
| Cash flows from (used in) financing activities | — |
2,137,000,000
GBP
|
389,000,000
GBP
|
— | — |
| Effect of exchange rate changes on cash and cash equivalents [abstract] | |||||
| Effect of exchange rate changes on cash and cash equivalents | — |
10,000,000
GBP
|
16,000,000
GBP
|
— | — |
| Increase (decrease) in cash and cash equivalents after effect of exchange rate changes | — |
4,869,000,000
GBP
|
13,119,000,000
GBP
|
— | — |
| Cash and cash equivalents |
25,955,000,000
GBP
|
— | — |
30,824,000,000
GBP
|
17,705,000,000
GBP
|