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 |
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 |
2021-01-01 to 2021-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of cash flows [abstract] | ||||||||||||||||||||
| Cash flows from (used in) operating activities [abstract] | ||||||||||||||||||||
| Profit (loss) | — |
–
GBP
|
–
GBP
|
54 9
GBP
|
1,000,000
GBP
|
5 61
GBP
|
11,000,000
GBP
|
–
GBP
|
561,000,000
GBP
|
–
GBP
|
–
GBP
|
994,000,000
GBP
|
— |
–
GBP
|
1,000,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
995,000,000
GBP
|
99 4
GBP
|
| Dividends received, classified as operating activities | — | — | — |
110,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
122,000,000
GBP
|
— |
| Interest paid, classified as operating activities | — | — | — |
–
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
1,000,000
GBP
|
— |
| Interest received, classified as operating activities | — | — | — |
38,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
22,000,000
GBP
|
— |
| Income taxes paid (refund), classified as operating activities | — | — | — |
36,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
22,000,000
GBP
|
— |
| Cash flows from (used in) operating activities | — | — | — |
110,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
14,000,000
GBP
|
— |
| Cash flows from (used in) investing activities [abstract] | ||||||||||||||||||||
| Cash flows from losing control of subsidiaries or other businesses, classified as investing activities | — | — | — |
–
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
112,000,000
GBP
|
— |
| Cash flows used in obtaining control of subsidiaries or other businesses, classified as investing activities | — | — | — |
1, 378
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
145,000,000
GBP
|
— |
| Purchase of property, plant and equipment, classified as investing activities | — | — | — |
21,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
12,000,000
GBP
|
— |
| Purchase of intangible assets, classified as investing activities | — | — | — |
6,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
–
GBP
|
— |
| Cash flows from (used in) investing activities | — | — | — |
86,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
755,000,000
GBP
|
— |
| Cash flows from (used in) financing activities [abstract] | ||||||||||||||||||||
| Payments to acquire or redeem entity's shares | — | — | — |
30 2
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
41,000,000
GBP
|
— |
| Dividends paid, classified as financing activities | — | — | — |
30 7
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
308,000,000
GBP
|
— |
| Cash flows from (used in) financing activities | — | — | — |
76 1
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
243,000,000
GBP
|
— |
| Increase (decrease) in cash and cash equivalents before effect of exchange rate changes | — | — | — |
73 7
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
526,000,000
GBP
|
— |
| Effect of exchange rate changes on cash and cash equivalents [abstract] | ||||||||||||||||||||
| Effect of exchange rate changes on cash and cash equivalents | — | — | — |
28,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — |
9,000,000
GBP
|
— |
| Cash and cash equivalents |
1,13 3
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
1,904,000,000
GBP
|
— | — | — | — | — | — | — |