Disclosure Of Entity's Operating Segments [Text Block]
| Concept |
2021-01-01 to 2021-12-31 |
As at 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 |
As at 2020-12-31 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|
| Disclosure of entity's operating segments [text block] | — | — | — | — | — | — | — | — | — | — |
| Disclosure of operating segments [text block] | — | — | — | — | — | — | — | — | — | — |
| Disclosure of operating segments [abstract] | ||||||||||
| Disclosure of operating segments [line items] | ||||||||||
| Revenue | — | — | — |
33,184,000,000
GBP
|
— | — | — |
31,292,000,000
GBP
|
— | — |
| Share of profit (loss) of associates and joint ventures accounted for using equity method | — | — | — |
146,000,000
GBP
|
— | — | — |
3,000,000
GBP
|
— | — |
| Tax expense (income) | — | — | — |
465,000,000
GBP
|
— | — | — |
346,000,000
GBP
|
— | — |
| Profit (loss) before tax | — | — | — |
801,000,000
GBP
|
— | — | — |
1,812,000,000
GBP
|
— | — |
| Profit (loss) from continuing operations | — | — | — |
336,000,000
GBP
|
— | — | — |
1,466,000,000
GBP
|
— | — |
| Profit (loss) |
70,000,000
GBP
|
— |
1,966,000,000
GBP
|
2,036,000,000
GBP
|
1,966,000,000
GBP
|
2,798,000,000
GBP
|
— |
2,910,000,000
GBP
|
112,000,000
GBP
|
2,798,000,000
GBP
|
| Assets | — |
358,474,000,000
GBP
|
— | — | — | — |
479,857,000,000
GBP
|
— | — | — |
| Liabilities | — |
339,020,000,000
GBP
|
— | — | — | — |
459,297,000,000
GBP
|
— | — | — |
| Cash flows from (used in) operating activities | — | — | — |
2,858,000,000
GBP
|
— | — | — |
2,985,000,000
GBP
|
— | — |
| Cash flows from (used in) investing activities | — | — | — |
74,000,000
GBP
|
— | — | — |
135,000,000
GBP
|
— | — |
| Cash flows from (used in) financing activities | — | — | — |
4,402,000,000
GBP
|
— | — | — |
871,000,000
GBP
|
— | — |
| Disclosure of products and services [text block] | — | — | — | — | — | — | — | — | — | — |
| Disclosure of products and services [abstract] | ||||||||||
| Disclosure of products and services [line items] | ||||||||||
| Disclosure of geographical areas [text block] | — | — | — | — | — | — | — | — | — | — |
| Disclosure of geographical areas [abstract] | ||||||||||
| Disclosure of geographical areas [line items] | ||||||||||
| Disclosure of major customers [text block] | — | — | — | — | — | — | — | — | — | — |
| Disclosure of major customers [abstract] | ||||||||||
| Disclosure of major customers [line items] |