Statement Of Cash Flows [Abstract]
| Concept |
As at 2023-06-30 |
2022-07-01 to 2023-06-30 |
2021-07-01 to 2022-06-30 |
As at 2022-06-30 |
2020-07-01 to 2021-06-30 |
As at 2021-06-30 |
|---|---|---|---|---|---|---|
| Statement of cash flows [abstract] | ||||||
| Cash flows from (used in) operating activities [abstract] | ||||||
| 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
|