Analysis Of Income And Expense [Abstract]
| Concept |
2023-01-01 to 2023-12-31 |
2023-01-01 to 2023-12-31 |
2023-01-01 to 2023-12-31 |
2023-01-01 to 2023-12-31 |
2023-01-01 to 2023-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Analysis of income and expense [abstract] | |||||||||||||||||
| Revenue [abstract] | |||||||||||||||||
| Interest income |
11,617,000,000
GBP
|
— | — | — | — | — | — | — |
6,708,000,000
GBP
|
— | — | — | — | — | — |
4,762,000,000
GBP
|
— |
| Material income and expense [abstract] | |||||||||||||||||
| Interest expense |
6,959,000,000
GBP
|
— | — | — | — | — | — | — |
2,283,000,000
GBP
|
— | — | — | — | — | — |
813,000,000
GBP
|
— |
| Interest income (expense) |
4,658,000,000
GBP
|
— | — | — | — | — | — | — |
4,425,000,000
GBP
|
— | — | — | — | — | — |
3,949,000,000
GBP
|
— |
| Other operating income (expense) |
135,000,000
GBP
|
— | — | — | — | — | — | — |
201,000,000
GBP
|
— | — | — | — | — | — |
264,000,000
GBP
|
— |
| Revenue and other operating income |
5,096,000,000
GBP
|
— | — | — | — | — | — | — |
4,956,000,000
GBP
|
— | — | — | — | — | — |
4,499,000,000
GBP
|
— |
| Fee and commission income (expense) [abstract] | |||||||||||||||||
| Fee and commission income [abstract] | |||||||||||||||||
| Fee and commission income |
804,000,000
GBP
|
— | — | — | — | — | — | — |
839,000,000
GBP
|
— | — | — | — | — | — |
697,000,000
GBP
|
— |
| Fee and commission expense [abstract] | |||||||||||||||||
| Fee and commission expense |
501,000,000
GBP
|
— | — | — | — | — | — | — |
509,000,000
GBP
|
— | — | — | — | — | — |
411,000,000
GBP
|
— |
| Fee and commission income (expense) |
303,000,000
GBP
|
— | — | — | — | — | — | — |
330,000,000
GBP
|
— | — | — | — | — | — |
286,000,000
GBP
|
— |
| Comprehensive income, continuing and discontinued operations [abstract] | |||||||||||||||||
| Comprehensive income |
1,868,000,000
GBP
|
780,000,000
GBP
|
1,099,000,000
GBP
|
1,868,000,000
GBP
|
11,000,000
GBP
|
1,235,000,000
GBP
|
296,000,000
GBP
|
20,000,000
GBP
|
296,000,000
GBP
|
959,000,000
GBP
|
—
GBP
|
19,000,000
GBP
|
374,000,000
GBP
|
3,000,000
GBP
|
1,833,000,000
GBP
|
1,852,000,000
GBP
|
2,210,000,000
GBP
|
| Comprehensive income attributable to owners of parent, continuing and discontinued operations [abstract] | |||||||||||||||||
| Comprehensive income, attributable to owners of parent |
1,868,000,000
GBP
|
— | — | — | — | — | — | — |
296,000,000
GBP
|
— | — | — | — | — | — |
1,833,000,000
GBP
|
— |
| Comprehensive income attributable to non-controlling interests, continuing and discontinued operations [abstract] | |||||||||||||||||
| Comprehensive income, attributable to non-controlling interests |
—
GBP
|
— | — | — | — | — | — | — |
—
GBP
|
— | — | — | — | — | — |
19,000,000
GBP
|
— |