Statement Of Cash Flows [Abstract]
| Concept |
As at 2022-09-17 |
2021-09-19 to 2022-09-17 |
2020-09-13 to 2021-09-18 |
As at 2021-09-18 |
|---|---|---|---|---|
| Statement of cash flows [abstract] | ||||
| Cash flows from (used in) operating activities [abstract] | ||||
| Cash flows from (used in) operations | — |
1,457,000,000
GBP
|
1,711,000,000
GBP
|
— |
| Income taxes paid (refund), classified as operating activities | — |
304,000,000
GBP
|
298,000,000
GBP
|
— |
| Cash flows from (used in) operating activities | — |
1,153,000,000
GBP
|
1,413,000,000
GBP
|
— |
| Cash flows from (used in) investing activities [abstract] | ||||
| Proceeds from sales of property, plant and equipment, classified as investing activities | — |
30,000,000
GBP
|
21,000,000
GBP
|
— |
| Purchase of property, plant and equipment, classified as investing activities | — |
680,000,000
GBP
|
551,000,000
GBP
|
— |
| Purchase of intangible assets, classified as investing activities | — |
89,000,000
GBP
|
76,000,000
GBP
|
— |
| Interest received, classified as investing activities | — |
17,000,000
GBP
|
9,000,000
GBP
|
— |
| Cash flows from (used in) investing activities | — |
744,000,000
GBP
|
561,000,000
GBP
|
— |
| Cash flows from (used in) financing activities [abstract] | ||||
| Payments from changes in ownership interests in subsidiaries that do not result in loss of control | — |
–
GBP
|
23,000,000
GBP
|
— |
| Payments of lease liabilities, classified as financing activities | — |
321,000,000
GBP
|
290,000,000
GBP
|
— |
| Interest paid, classified as financing activities | — |
114,000,000
GBP
|
116,000,000
GBP
|
— |
| Cash flows from (used in) financing activities | — |
677,000,000
GBP
|
512,000,000
GBP
|
— |
| Increase (decrease) in cash and cash equivalents before effect of exchange rate changes | — |
268,000,000
GBP
|
340,000,000
GBP
|
— |
| Effect of exchange rate changes on cash and cash equivalents [abstract] | ||||
| Effect of exchange rate changes on cash and cash equivalents | — |
74,000,000
GBP
|
60,000,000
GBP
|
— |
| Cash and cash equivalents |
2,121,000,000
GBP
|
— | — |
2,275,000,000
GBP
|