Statement Of Financial Position [Abstract]
| Concept |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of financial position [abstract] | ||||||||||||||||||||||||||||||||
| Assets [abstract] | ||||||||||||||||||||||||||||||||
| Other financial assets | — | — | — |
29,031,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
37,995,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Assets | — | — | — |
434,563,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
389,539,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Equity and liabilities [abstract] | ||||||||||||||||||||||||||||||||
| Equity [abstract] | ||||||||||||||||||||||||||||||||
| Equity attributable to owners of parent | — | — | — |
20,727,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
19,882,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Non-controlling interests | — | — | — |
10,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
10,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Equity |
13,507,000,000
GBP
|
820,000,000
GBP
|
2,377,000,000
GBP
|
20,737,000,000
GBP
|
1,000,000
GBP
|
192,000,000
GBP
|
85,000,000
GBP
|
14,000,000
GBP
|
20,727,000,000
GBP
|
10,000,000
GBP
|
12,720,000,000
GBP
|
10,000,000
GBP
|
133,000,000
GBP
|
2,370,000,000
GBP
|
19,882,000,000
GBP
|
1,678,000,000
GBP
|
63,000,000
GBP
|
9,000,000
GBP
|
2,225,000,000
GBP
|
19,892,000,000
GBP
|
280,000,000
GBP
|
796,000,000
GBP
|
6,000,000
GBP
|
2,370,000,000
GBP
|
167,000,000
GBP
|
2,225,000,000
GBP
|
12,223,000,000
GBP
|
250,000,000
GBP
|
796,000,000
GBP
|
27,000,000
GBP
|
70,000,000
GBP
|
1,678,000,000
GBP
|
| Liabilities [abstract] | ||||||||||||||||||||||||||||||||
| Other financial liabilities | — | — | — |
7,251,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
10,383,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Liabilities | — | — | — |
413,826,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
369,647,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
| Equity and liabilities | — | — | — |
434,563,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
389,539,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |