Statement Of Changes In Equity [Abstract]
| Concept |
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 2022-10-01 |
As at 2022-10-01 |
As at 2022-10-01 |
As at 2022-10-01 |
As at 2022-10-01 |
As at 2022-10-01 |
As at 2022-10-01 |
As at 2022-09-30 |
2021-10-01 to 2022-09-30 |
2021-10-01 to 2022-09-30 |
2021-10-01 to 2022-09-30 |
2021-10-01 to 2022-09-30 |
2021-10-01 to 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 |
2021-10-01 to 2022-09-30 |
2021-10-01 to 2022-09-30 |
As at 2021-10-01 |
As at 2021-10-01 |
As at 2021-10-01 |
As at 2021-10-01 |
As at 2021-10-01 |
As at 2021-10-01 |
As at 2021-10-01 |
As at 2021-10-01 |
As at 2021-10-01 |
As at 2021-10-01 |
As at 2021-10-01 |
As at 2021-10-01 |
As at 2021-10-01 |
As at 2021-10-01 |
As at 2021-09-30 |
As at 2021-09-30 |
As at 2021-09-30 |
As at 2021-09-30 |
As at 2021-09-30 |
As at 2021-09-30 |
As at 2021-09-30 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Statement of changes in equity [line items] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Equity |
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
|
— |
103,000,000
GBP
|
443,000,000
GBP
|
1,363,000,000
GBP
|
5,837,000,000
GBP
|
6,860,000,000
GBP
|
7,473,000,000
GBP
|
613,000,000
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
|
— | — |
–
GBP
|
–
GBP
|
103,000,000
GBP
|
766,000,000
GBP
|
200,000,000
GBP
|
5,962,000,000
GBP
|
588,000,000
GBP
|
5,374,000,000
GBP
|
–
GBP
|
22,000,000
GBP
|
–
GBP
|
22,000,000
GBP
|
22,000,000
GBP
|
5,837,000,000
GBP
|
5,837,000,000
GBP
|
200,000,000
GBP
|
588,000,000
GBP
|
5,352,000,000
GBP
|
788,000,000
GBP
|
5,940,000,000
GBP
|
103,000,000
GBP
|
| Changes in equity [abstract] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Comprehensive income [abstract] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Profit (loss) | — |
–
GBP
|
2,328,000,000
GBP
|
— |
2,328,000,000
GBP
|
— | — | — |
–
GBP
|
–
GBP
|
128,000,000
GBP
|
— | — |
2,456,000,000
GBP
|
— | — | — | — | — | — | — | — |
95,000,000
GBP
|
1,570,000,000
GBP
|
–
GBP
|
1,570,000,000
GBP
|
–
GBP
|
— | — | — | — | — | — |
–
GBP
|
1,665,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Other comprehensive income | — |
–
GBP
|
844,000,000
GBP
|
— |
236,000,000
GBP
|
— | — | — |
–
GBP
|
608,000,000
GBP
|
15,000,000
GBP
|
— | — |
859,000,000
GBP
|
— | — | — | — | — | — | — | — |
16,000,000
GBP
|
1,208,000,000
GBP
|
–
GBP
|
45,000,000
GBP
|
1,163,000,000
GBP
|
— | — | — | — | — | — |
–
GBP
|
1,224,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Comprehensive income | — |
–
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
|
— | — | — | — | — | — | — | — |
111,000,000
GBP
|
2,778,000,000
GBP
|
–
GBP
|
1,615,000,000
GBP
|
1,163,000,000
GBP
|
— | — | — | — | — | — |
–
GBP
|
2,889,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Dividends recognised as distributions to owners | — |
–
GBP
|
1,312,000,000
GBP
|
— |
1,312,000,000
GBP
|
— | — | — |
–
GBP
|
–
GBP
|
104,000,000
GBP
|
— | — |
1,416,000,000
GBP
|
— | — | — | — | — | — | — | — |
89,000,000
GBP
|
1,320,000,000
GBP
|
–
GBP
|
1,320,000,000
GBP
|
–
GBP
|
— | — | — | — | — | — |
–
GBP
|
1,409,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |