Statement Of Cash Flows [Abstract]
| Concept |
As at 2023-09-16 |
2022-09-18 to 2023-09-16 |
As at 2022-09-17 |
2021-09-19 to 2022-09-17 |
|---|---|---|---|---|
| Statement of cash flows [abstract] | ||||
| Cash flows from (used in) operating activities [abstract] | ||||
| Cash flows from (used in) operations | — |
1,995,000,000
GBP
|
— |
1,457,000,000
GBP
|
| Income taxes paid (refund), classified as operating activities | — |
341,000,000
GBP
|
— |
304,000,000
GBP
|
| Cash flows from (used in) operating activities | — |
1,654,000,000
GBP
|
— |
1,153,000,000
GBP
|
| Cash flows from (used in) investing activities [abstract] | ||||
| Proceeds from sales of property, plant and equipment, classified as investing activities | — |
48,000,000
GBP
|
— |
30,000,000
GBP
|
| Purchase of property, plant and equipment, classified as investing activities | — |
997,000,000
GBP
|
— |
680,000,000
GBP
|
| Purchase of intangible assets, classified as investing activities | — |
76,000,000
GBP
|
— |
89,000,000
GBP
|
| Interest received, classified as investing activities | — |
44,000,000
GBP
|
— |
17,000,000
GBP
|
| Cash flows from (used in) investing activities | — |
906,000,000
GBP
|
— |
744,000,000
GBP
|
| Cash flows from (used in) financing activities [abstract] | ||||
| Payments to acquire or redeem entity's shares | — |
448,000,000
GBP
|
— |
–
GBP
|
| Payments of lease liabilities, classified as financing activities | — |
308,000,000
GBP
|
— |
321,000,000
GBP
|
| Interest paid, classified as financing activities | — |
118,000,000
GBP
|
— |
114,000,000
GBP
|
| Cash flows from (used in) financing activities | — |
1,282,000,000
GBP
|
— |
677,000,000
GBP
|
| Increase (decrease) in cash and cash equivalents before effect of exchange rate changes | — |
534,000,000
GBP
|
— |
268,000,000
GBP
|
| Effect of exchange rate changes on cash and cash equivalents [abstract] | ||||
| Effect of exchange rate changes on cash and cash equivalents | — |
73,000,000
GBP
|
— |
74,000,000
GBP
|
| Cash and cash equivalents |
1,457,000,000
GBP
|
— |
2,121,000,000
GBP
|
— |