Disclosure Of Effect Of Changes In Foreign Exchange Rates [Text Block]
| 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 |
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 |
2019-01-01 to 2019-12-31 |
2019-01-01 to 2019-12-31 |
2019-01-01 to 2019-12-31 |
2019-01-01 to 2019-12-31 |
2019-01-01 to 2019-12-31 |
2019-01-01 to 2019-12-31 |
2019-01-01 to 2019-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Disclosure of effect of changes in foreign exchange rates [text block] | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Disclosure of information when currency is not exchangeable into another currency [text block] | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Disclosure of information when foreign operation’s functional currency is not exchangeable into presentation currency [text block] | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Disclosure of summarised financial information about foreign operation [text block] | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Disclosure of summarised financial information about foreign operation [abstract] | |||||||||||||||||||||
| Disclosure of summarised financial information about foreign operation [line items] | |||||||||||||||||||||
| Profit (loss) from continuing operations | — | — | — | — | — |
1,353,000,000
GBP
|
— |
439,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
703,000,000
GBP
|
— | — |
| Profit (loss) from discontinued operations | — | — | — | — | — |
31,000,000
GBP
|
— |
32,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
30,000,000
GBP
|
— | — |
| Profit (loss) |
19,000,000
GBP
|
— |
1,365,000,000
GBP
|
— | — |
1,384,000,000
GBP
|
1,365,000,000
GBP
|
471,000,000
GBP
|
452,000,000
GBP
|
— | — | — |
19,000,000
GBP
|
452,000,000
GBP
|
— |
714,000,000
GBP
|
714,000,000
GBP
|
19,000,000
GBP
|
733,000,000
GBP
|
— | — |
| Other comprehensive income | — | — | — | — | — |
468,000,000
GBP
|
— |
260,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
338,000,000
GBP
|
— | — |
| Comprehensive income |
19,000,000
GBP
|
374,000,000
GBP
|
1,833,000,000
GBP
|
—
GBP
|
3,000,000
GBP
|
1,852,000,000
GBP
|
2,210,000,000
GBP
|
211,000,000
GBP
|
79,000,000
GBP
|
5,000,000
GBP
|
110,000,000
GBP
|
—
GBP
|
17,000,000
GBP
|
194,000,000
GBP
|
4,000,000
GBP
|
374,000,000
GBP
|
263,000,000
GBP
|
21,000,000
GBP
|
395,000,000
GBP
|
—
GBP
|
115,000,000
GBP
|