Statement Of Cash Flows [Abstract]
| Concept |
2022-07-01 to 2023-06-30 |
As at 2023-06-30 |
2022-07-01 to 2023-06-30 |
2022-07-01 to 2023-06-30 |
2022-07-01 to 2023-06-30 |
2022-07-01 to 2023-06-30 |
2021-07-01 to 2022-06-30 |
2021-07-01 to 2022-06-30 |
2021-07-01 to 2022-06-30 |
2021-07-01 to 2022-06-30 |
2021-07-01 to 2022-06-30 |
As at 2022-06-30 |
2020-07-01 to 2021-06-30 |
2020-07-01 to 2021-06-30 |
2020-07-01 to 2021-06-30 |
As at 2021-06-30 |
2020-07-01 to 2021-06-30 |
2020-07-01 to 2021-06-30 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of cash flows [abstract] | ||||||||||||||||||
| Cash flows from (used in) operating activities [abstract] | ||||||||||||||||||
| Profit (loss) |
3,734,000,000
GBP
|
— |
3,766,000,000
GBP
|
3,734,000,000
GBP
|
32,000,000
GBP
|
3,734,000,000
GBP
|
3,249,000,000
GBP
|
3,338,000,000
GBP
|
3,249,000,000
GBP
|
3,249,000,000
GBP
|
89,000,000
GBP
|
— |
2,799,000,000
GBP
|
2,660,000,000
GBP
|
139,000,000
GBP
|
— |
2,660,000,000
GBP
|
2,660,000,000
GBP
|
| Adjustments to reconcile profit (loss) [abstract] | ||||||||||||||||||
| Adjustments for decrease (increase) in inventories | — | — |
675,000,000
GBP
|
— | — | — | — |
740,000,000
GBP
|
— | — | — | — |
443,000,000
GBP
|
— | — | — | — | — |
| Other adjustments to reconcile profit (loss) | — | — |
62,000,000
GBP
|
— | — | — | — |
53,000,000
GBP
|
— | — | — | — |
88,000,000
GBP
|
— | — | — | — | — |
| Cash flows from (used in) operations | — | — |
4,779,000,000
GBP
|
— | — | — | — |
5,212,000,000
GBP
|
— | — | — | — |
4,857,000,000
GBP
|
— | — | — | — | — |
| Dividends received, classified as operating activities | — | — |
219,000,000
GBP
|
— | — | — | — |
190,000,000
GBP
|
— | — | — | — |
290,000,000
GBP
|
— | — | — | — | — |
| Interest paid, classified as operating activities | — | — |
685,000,000
GBP
|
— | — | — | — |
438,000,000
GBP
|
— | — | — | — |
440,000,000
GBP
|
— | — | — | — | — |
| Interest received, classified as operating activities | — | — |
131,000,000
GBP
|
— | — | — | — |
110,000,000
GBP
|
— | — | — | — |
89,000,000
GBP
|
— | — | — | — | — |
| Cash flows from (used in) operating activities | — | — |
3,024,000,000
GBP
|
— | — | — | — |
3,935,000,000
GBP
|
— | — | — | — |
3,654,000,000
GBP
|
— | — | — | — | — |
| Cash flows from (used in) investing activities [abstract] | ||||||||||||||||||
| Cash flows used in obtaining control of subsidiaries or other businesses, classified as investing activities | — | — |
342,000,000
GBP
|
— | — | — | — |
206,000,000
GBP
|
— | — | — | — |
450,000,000
GBP
|
— | — | — | — | — |
| Cash flows from (used in) investing activities | — | — |
1,197,000,000
GBP
|
— | — | — | — |
1,341,000,000
GBP
|
— | — | — | — |
1,091,000,000
GBP
|
— | — | — | — | — |
| Cash flows from (used in) financing activities [abstract] | ||||||||||||||||||
| Cash flows from (used in) financing activities | — | — |
2,408,000,000
GBP
|
— | — | — | — |
3,259,000,000
GBP
|
— | — | — | — |
2,794,000,000
GBP
|
— | — | — | — | — |
| Increase (decrease) in cash and cash equivalents before effect of exchange rate changes | — | — |
581,000,000
GBP
|
— | — | — | — |
665,000,000
GBP
|
— | — | — | — |
231,000,000
GBP
|
— | — | — | — | — |
| Effect of exchange rate changes on cash and cash equivalents [abstract] | ||||||||||||||||||
| Effect of exchange rate changes on cash and cash equivalents | — | — |
227,000,000
GBP
|
— | — | — | — |
239,000,000
GBP
|
— | — | — | — |
285,000,000
GBP
|
— | — | — | — | — |
| Cash and cash equivalents | — |
1,439,000,000
GBP
|
— | — | — | — | — | — | — | — | — |
2,285,000,000
GBP
|
— | — | — |
2,749,000,000
GBP
|
— | — |