Statement Of Changes In Equity [Abstract]
| Concept |
As at 2024-09-30 |
2023-10-01 to 2024-09-30 |
As at 2024-09-30 |
As at 2024-09-30 |
As at 2024-09-30 |
As at 2024-09-30 |
2023-10-01 to 2024-09-30 |
2023-10-01 to 2024-09-30 |
As at 2024-09-30 |
2023-10-01 to 2024-09-30 |
As at 2024-09-30 |
2023-10-01 to 2024-09-30 |
2023-10-01 to 2024-09-30 |
2023-10-01 to 2024-09-30 |
As at 2023-09-30 |
2022-10-01 to 2023-09-30 |
2022-10-01 to 2023-09-30 |
As at 2023-09-30 |
2022-10-01 to 2023-09-30 |
As at 2023-09-30 |
As at 2023-09-30 |
As at 2023-09-30 |
2022-10-01 to 2023-09-30 |
2022-10-01 to 2023-09-30 |
2022-10-01 to 2023-09-30 |
As at 2023-09-30 |
As at 2023-09-30 |
2022-10-01 to 2023-09-30 |
As at 2022-09-30 |
As at 2022-09-30 |
As at 2022-09-30 |
As at 2022-09-30 |
As at 2022-09-30 |
As at 2022-09-30 |
As at 2022-09-30 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | |||||||||||||||||||||||||||||||||||
| Statement of changes in equity [line items] | |||||||||||||||||||||||||||||||||||
| Equity |
6,029,000,000
GBP
|
— |
5,849,000,000
GBP
|
91,000,000
GBP
|
5,442,000,000
GBP
|
19,000,000
GBP
|
— | — |
587,000,000
GBP
|
— |
479,000,000
GBP
|
— | — | — |
5,843,000,000
GBP
|
— | — |
755,000,000
GBP
|
— |
674,000,000
GBP
|
621,000,000
GBP
|
6,021,000,000
GBP
|
— | — | — |
97,000,000
GBP
|
6,642,000,000
GBP
|
— |
5,837,000,000
GBP
|
7,473,000,000
GBP
|
6,860,000,000
GBP
|
443,000,000
GBP
|
613,000,000
GBP
|
103,000,000
GBP
|
1,363,000,000
GBP
|
| Changes in equity [abstract] | |||||||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | |||||||||||||||||||||||||||||||||||
| Profit (loss) | — |
–
GBP
|
— | — | — | — |
–
GBP
|
134,000,000
GBP
|
— |
2,613,000,000
GBP
|
— |
2,613,000,000
GBP
|
–
GBP
|
2,747,000,000
GBP
|
— |
–
GBP
|
2,328,000,000
GBP
|
— |
2,328,000,000
GBP
|
— | — | — |
–
GBP
|
–
GBP
|
128,000,000
GBP
|
— | — |
2,456,000,000
GBP
|
— | — | — | — | — | — | — |
| Other comprehensive income | — |
–
GBP
|
— | — | — | — |
774,000,000
GBP
|
25,000,000
GBP
|
— |
830,000,000
GBP
|
— |
56,000,000
GBP
|
–
GBP
|
855,000,000
GBP
|
— |
–
GBP
|
844,000,000
GBP
|
— |
236,000,000
GBP
|
— | — | — |
–
GBP
|
608,000,000
GBP
|
15,000,000
GBP
|
— | — |
859,000,000
GBP
|
— | — | — | — | — | — | — |
| Comprehensive income | — |
–
GBP
|
— | — | — | — |
774,000,000
GBP
|
109,000,000
GBP
|
— |
1,783,000,000
GBP
|
— |
2,557,000,000
GBP
|
–
GBP
|
1,892,000,000
GBP
|
— |
–
GBP
|
1,484,000,000
GBP
|
— |
2,092,000,000
GBP
|
— | — | — |
–
GBP
|
608,000,000
GBP
|
113,000,000
GBP
|
— | — |
1,597,000,000
GBP
|
— | — | — | — | — | — | — |
| Dividends recognised as distributions to owners | — |
–
GBP
|
— | — | — | — |
–
GBP
|
136,000,000
GBP
|
— |
1,299,000,000
GBP
|
— |
1,299,000,000
GBP
|
–
GBP
|
1,435,000,000
GBP
|
— |
–
GBP
|
1,312,000,000
GBP
|
— |
1,312,000,000
GBP
|
— | — | — |
–
GBP
|
–
GBP
|
104,000,000
GBP
|
— | — |
1,416,000,000
GBP
|
— | — | — | — | — | — | — |