Statement Of Cash Flows [Abstract]
| Concept |
As at 2022-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
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 |
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 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of cash flows [abstract] | ||||||||||||||||||||||
| Cash flows from (used in) operating activities [abstract] | ||||||||||||||||||||||
| Profit (loss) | — |
–
GBP
|
–
GBP
|
303,000,000
GBP
|
308,000,000
GBP
|
5,000,000
GBP
|
–
GBP
|
–
GBP
|
308,000,000
GBP
|
–
GBP
|
–
GBP
|
4,000,000
GBP
|
–
GBP
|
–
GBP
|
833,000,000
GBP
|
— |
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
837,000,000
GBP
|
833,000,000
GBP
|
| Cash flows from (used in) operating activities | — | — | — |
204,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
263,000,000
GBP
|
— |
| Cash flows from (used in) investing activities [abstract] | ||||||||||||||||||||||
| Cash flows from losing control of subsidiaries or other businesses, classified as investing activities | — | — | — |
478,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
2,703,000,000
GBP
|
— |
| Cash flows used in obtaining control of subsidiaries or other businesses, classified as investing activities | — | — | — |
4,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
–
GBP
|
— |
| Proceeds from sales of property, plant and equipment, classified as investing activities | — | — | — |
66,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
13,000,000
GBP
|
— |
| Purchase of property, plant and equipment, classified as investing activities | — | — | — |
271,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
218,000,000
GBP
|
— |
| Dividends received, classified as investing activities | — | — | — |
59,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
52,000,000
GBP
|
— |
| Interest received, classified as investing activities | — | — | — |
4,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
2,000,000
GBP
|
— |
| Cash flows from (used in) investing activities | — | — | — |
192,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
2,511,000,000
GBP
|
— |
| Cash flows from (used in) financing activities [abstract] | ||||||||||||||||||||||
| Proceeds from borrowings, classified as financing activities | — | — | — |
632,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
–
GBP
|
— |
| Repayments of borrowings, classified as financing activities | — | — | — |
598,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
1,555,000,000
GBP
|
— |
| Payments of lease liabilities, classified as financing activities | — | — | — |
51,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
53,000,000
GBP
|
— |
| Cash flows from (used in) financing activities | — | — | — |
599,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
2,466,000,000
GBP
|
— |
| Increase (decrease) in cash and cash equivalents before effect of exchange rate changes | — | — | — |
203,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
308,000,000
GBP
|
— |
| Effect of exchange rate changes on cash and cash equivalents [abstract] | ||||||||||||||||||||||
| Effect of exchange rate changes on cash and cash equivalents | — | — | — |
27,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
–
GBP
|
— |
| Cash and cash equivalents |
355,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
473,000,000
GBP
|
— | — | — | — | — | — |