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] | |||||
| Dividends received, classified as operating activities | — |
2 ,220
GBP
|
— |
2,06 6
GBP
|
— |
| Interest paid, classified as operating activities | — |
8 8
GBP
|
— |
14 4
GBP
|
— |
| Interest received, classified as operating activities | — |
2 ,529
GBP
|
— |
2 ,321
GBP
|
— |
| Income taxes paid (refund), classified as operating activities | — |
2 6 8
GBP
|
— |
33 2
GBP
|
— |
| Cash flows from (used in) operating activities | — |
5 04
GBP
|
— |
1,302,000,000
GBP
|
— |
| Cash flows from (used in) investing activities [abstract] | |||||
| Cash flows from losing control of subsidiaries or other businesses, classified as investing activities | — |
429,000,000
GBP
|
— |
250,000,000
GBP
|
— |
| Proceeds from sales of property, plant and equipment, classified as investing activities | — |
1,000,000
GBP
|
— |
41,000,000
GBP
|
— |
| Purchase of property, plant and equipment, classified as investing activities | — |
57 3
GBP
|
— |
7 7 0
GBP
|
— |
| Cash flows from (used in) investing activities | — |
3 6 8
GBP
|
— |
4 6 6
GBP
|
— |
| Cash flows from (used in) financing activities [abstract] | |||||
| Payments to acquire or redeem entity's shares | — |
5 03
GBP
|
— |
—
GBP
|
— |
| Payments of lease liabilities, classified as financing activities | — |
3 0
GBP
|
— |
2 3
GBP
|
— |
| Interest paid, classified as financing activities | — |
1 9 0
GBP
|
— |
18 6
GBP
|
— |
| Cash flows from (used in) financing activities | — |
1,202,000,000
GBP
|
— |
6 81
GBP
|
— |
| Increase (decrease) in cash and cash equivalents before effect of exchange rate changes | — |
2 , 0 74
GBP
|
— |
155,000,000
GBP
|
— |
| Effect of exchange rate changes on cash and cash equivalents [abstract] | |||||
| Effect of exchange rate changes on cash and cash equivalents | — |
50,000,000
GBP
|
— |
2 3
GBP
|
— |
| Cash and cash equivalents |
4 ,884
GBP
|
— |
6,908,000,000
GBP
|
— |
6,7 76
GBP
|