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 | — | — | — | — | — | — | — |
33,184,000,000
GBP
|
— |
31,292,000,000
GBP
|
— | — | — | — | — | — |
| Material income and expense [abstract] | ||||||||||||||||
| Gains (losses) on disposals of investments [abstract] | ||||||||||||||||
| Gains (losses) on disposals of investments | — | — | — | — | — | — | — |
22,000,000
GBP
|
— |
12,000,000
GBP
|
— | — | — | — | — | — |
| Investment income | — | — | — | — | — | — | — |
17,138,000,000
GBP
|
— |
14,971,000,000
GBP
|
— | — | — | — | — | — |
| Fee and commission income (expense) [abstract] | ||||||||||||||||
| Fee and commission income [abstract] | ||||||||||||||||
| Fee and commission income | — | — | — | — | — | — | — |
1,488,000,000
GBP
|
— |
1,317,000,000
GBP
|
— | — | — | — | — | — |
| Fee and commission expense [abstract] | ||||||||||||||||
| Fee and commission expense | — | — | — | — | — | — | — |
3,172,000,000
GBP
|
— |
3,047,000,000
GBP
|
— | — | — | — | — | — |
| Expenses by nature [abstract] | ||||||||||||||||
| Other expenses, by nature | — | — | — | — | — | — | — |
2,211,000,000
GBP
|
— |
2,530,000,000
GBP
|
— | — | — | — | — | — |
| Expenses, by nature | — | — | — | — | — | — | — |
32,383,000,000
GBP
|
— |
29,480,000,000
GBP
|
— | — | — | — | — | — |
| Share of profit (loss) of associates and joint ventures accounted for using equity method [abstract] | ||||||||||||||||
| Share of profit (loss) of associates and joint ventures accounted for using equity method | — | — | — | — | — | — | — |
146,000,000
GBP
|
— |
3,000,000
GBP
|
— | — | — | — | — | — |
| Share of other comprehensive income of associates and joint ventures accounted for using equity method, before tax [abstract] | ||||||||||||||||
| Share of other comprehensive income of associates and joint ventures accounted for using equity method that will be reclassified to profit or loss, before tax | — | — | — | — | — | — | — |
5,000,000
GBP
|
— |
16,000,000
GBP
|
— | — | — | — | — | — |
| Income tax relating to components of other comprehensive income [abstract] | ||||||||||||||||
| Income tax relating to components of other comprehensive income that will not be reclassified to profit or loss | — | — | — | — | — | — | — |
159,000,000
GBP
|
— |
21,000,000
GBP
|
— | — | — | — | — | — |
| Income tax relating to components of other comprehensive income that will be reclassified to profit or loss | — | — | — | — | — | — | — |
7,000,000
GBP
|
— |
9,000,000
GBP
|
— | — | — | — | — | — |
| Comprehensive income, continuing and discontinued operations [abstract] | ||||||||||||||||
| Comprehensive income |
1,659,000,000
GBP
|
23,000,000
GBP
|
1,866,000,000
GBP
|
37,000,000
GBP
|
1,622,000,000
GBP
|
1,459,000,000
GBP
|
221,000,000
GBP
|
200,000,000
GBP
|
2,897,000,000
GBP
|
1,252,000,000
GBP
|
2,751,000,000
GBP
|
146,000,000
GBP
|
97,000,000
GBP
|
221,000,000
GBP
|
1,645,000,000
GBP
|
2,627,000,000
GBP
|
| Comprehensive income attributable to owners of parent, continuing and discontinued operations [abstract] | ||||||||||||||||
| Comprehensive income, attributable to owners of parent | — | — | — | — | — |
1,444,000,000
GBP
|
— |
178,000,000
GBP
|
— |
1,231,000,000
GBP
|
— | — | — | — |
1,520,000,000
GBP
|
— |
| Comprehensive income attributable to non-controlling interests, continuing and discontinued operations [abstract] | ||||||||||||||||
| Comprehensive income, attributable to non-controlling interests | — | — | — | — | — |
15,000,000
GBP
|
— |
22,000,000
GBP
|
— |
21,000,000
GBP
|
— | — | — | — |
125,000,000
GBP
|
— |