Statement Of Cash Flows [Abstract]
| Concept |
As at 2022-12-31 |
2022-01-01 to 2022-12-31 |
As at 2021-12-31 |
2021-01-01 to 2021-12-31 |
As at 2020-12-31 |
|---|---|---|---|---|---|
| Statement of cash flows [abstract] | |||||
| Cash flows from (used in) operating activities [abstract] | |||||
| Cash flows from (used in) operating activities | — |
2, 839
GBP
|
— |
2 ,4 47
GBP
|
— |
| Cash flows from (used in) investing activities [abstract] | |||||
| Cash flows from losing control of subsidiaries or other businesses, classified as investing activities | — |
12 4
GBP
|
— |
215,000,000
GBP
|
— |
| Cash flows used in obtaining control of subsidiaries or other businesses, classified as investing activities | — |
16 2
GBP
|
— |
3 0
GBP
|
— |
| Purchase of intangible assets, classified as investing activities | — |
9 4
GBP
|
— |
96,000,000
GBP
|
— |
| Dividends received, classified as investing activities | — |
94,000,000
GBP
|
— |
57,000,000
GBP
|
— |
| Interest received, classified as investing activities | — |
32,000,000
GBP
|
— |
23,000,000
GBP
|
— |
| Cash flows from (used in) investing activities | — |
4 22
GBP
|
— |
66,000,000
GBP
|
— |
| Cash flows from (used in) financing activities [abstract] | |||||
| Proceeds from changes in ownership interests in subsidiaries that do not result in loss of control | — |
–
GBP
|
— |
28,000,000
GBP
|
— |
| Payments to acquire or redeem entity's shares | — |
78 8
GBP
|
— |
3 68
GBP
|
— |
| Repayments of borrowings, classified as financing activities | — |
4 0 0
GBP
|
— |
367,000,000
GBP
|
— |
| Payments of lease liabilities, classified as financing activities | — |
236,000,000
GBP
|
— |
217,000,000
GBP
|
— |
| Interest paid, classified as financing activities | — |
269,000,000
GBP
|
— |
247,000,000
GBP
|
— |
| Cash flows from (used in) financing activities | — |
2, 333
GBP
|
— |
2, 256
GBP
|
— |
| Increase (decrease) in cash and cash equivalents before effect of exchange rate changes | — |
84,000,000
GBP
|
— |
257,000,000
GBP
|
— |
| Effect of exchange rate changes on cash and cash equivalents [abstract] | |||||
| Effect of exchange rate changes on cash and cash equivalents | — |
10 6
GBP
|
— |
7,000,000
GBP
|
— |
| Cash and cash equivalents |
3 ,1 0 7
GBP
|
— |
2 , 9 17
GBP
|
— |
2,6 67
GBP
|