Statement Of Comprehensive Income [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 |
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 |
2020-01-01 to 2020-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of comprehensive income [abstract] | ||||||||||||||||||
| Profit (loss) | — | — | — | — | — | — | — |
995,000,000
GBP
|
— | — | — |
838,000,000
GBP
|
— | — | — | — | — | — |
| Other comprehensive income [abstract] | ||||||||||||||||||
| Other comprehensive income that will not be reclassified to profit or loss, net of tax | — | — | — | — | — | — | — |
132,000,000
GBP
|
— | — | — |
269,000,000
GBP
|
— | — | — | — | — | — |
| Other comprehensive income that will be reclassified to profit or loss, net of tax | — | — | — | — | — | — | — |
9,000,000
GBP
|
— | — | — |
19,000,000
GBP
|
— | — | — | — | — | — |
| Other comprehensive income | — | — | — | — | — | — | — |
141,000,000
GBP
|
— | — | — |
288,000,000
GBP
|
— | — | — | — | — | — |
| Comprehensive income |
–
GBP
|
1,000,000
GBP
|
–
GBP
|
–
GBP
|
22,000,000
GBP
|
–
GBP
|
1,135,000,000
GBP
|
1,136,000,000
GBP
|
1,113,000,000
GBP
|
1,115,000,000
GBP
|
–
GBP
|
1,126,000,000
GBP
|
5,000,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
1,121,000,000
GBP
|
6,000,000
GBP
|