Analysis Of Income And Expense [Abstract]
| Concept |
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 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Analysis of income and expense [abstract] | ||||||||||||||||
| Revenue [abstract] | ||||||||||||||||
| Revenue | — | — | — | — | — | — |
4,686,000,000
GBP
|
— | — | — |
3 , 4 61
GBP
|
— | — | — | — | — |
| Material income and expense [abstract] | ||||||||||||||||
| Investment income | — | — | — | — | — | — |
4, 0 02
GBP
|
— | — | — |
2, 856
GBP
|
— | — | — | — | — |
| Miscellaneous other operating expense | — | — | — | — | — | — |
63 6
GBP
|
— | — | — |
6 51
GBP
|
— | — | — | — | — |
| Operating expense | — | — | — | — | — | — |
4, 6 0 3
GBP
|
— | — | — |
3 , 45 2
GBP
|
— | — | — | — | — |
| Fee and commission income (expense) [abstract] | ||||||||||||||||
| Fee and commission income [abstract] | ||||||||||||||||
| Fee and commission income | — | — | — | — | — | — |
666,000,000
GBP
|
— | — | — |
585,000,000
GBP
|
— | — | — | — | — |
| Fee and commission expense [abstract] | ||||||||||||||||
| Fee and commission expense | — | — | — | — | — | — |
61,000,000
GBP
|
— | — | — |
52,000,000
GBP
|
— | — | — | — | — |
| Miscellaneous other comprehensive income [abstract] | ||||||||||||||||
| Other comprehensive income, net of tax, exchange differences on translation of foreign operations and hedges of net investments in foreign operations [abstract] | ||||||||||||||||
| Other comprehensive income, net of tax, exchange differences on translation of foreign operations | — | — | — | — | — | — |
1,000,000
GBP
|
— | — | — |
–
GBP
|
— | — | — | — | — |
| Comprehensive income, continuing and discontinued operations [abstract] | ||||||||||||||||
| Comprehensive income |
–
GBP
|
–
GBP
|
–
GBP
|
1,000,000
GBP
|
–
GBP
|
–
GBP
|
15 3
GBP
|
15 4
GBP
|
88,000,000
GBP
|
–
GBP
|
88,000,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
| Comprehensive income attributable to owners of parent, continuing and discontinued operations [abstract] | ||||||||||||||||
| Comprehensive income, attributable to owners of parent | — | — | — | — | — | — |
15 3
GBP
|
— | — | — |
88,000,000
GBP
|
— | — | — | — | — |