Statement Of Cash Flows [Abstract]
| Concept |
2024-01-01 to 2024-12-31 |
As at 2024-12-31 |
2023-01-01 to 2023-12-31 |
As at 2023-12-31 |
As at 2022-12-31 |
2022-01-01 to 2022-12-31 |
As at 2021-12-31 |
|---|---|---|---|---|---|---|---|
| Statement of cash flows [abstract] | |||||||
| Cash flows from (used in) operating activities [abstract] | |||||||
| Cash flows from (used in) operating activities |
3,331,000,000
GBP
|
— |
3,304,000,000
GBP
|
— | — |
3,992,000,000
GBP
|
— |
| Cash flows from (used in) investing activities [abstract] | |||||||
| Cash flows from (used in) investing activities |
4,540,000,000
GBP
|
— |
2,747,000,000
GBP
|
— | — |
198,000,000
GBP
|
— |
| Cash flows from (used in) financing activities [abstract] | |||||||
| Proceeds from issuing other equity instruments |
400,000,000
GBP
|
— |
—
GBP
|
— | — |
750,000,000
GBP
|
— |
| Payments of other equity instruments |
500,000,000
GBP
|
— |
—
GBP
|
— | — |
985,000,000
GBP
|
— |
| Payments of lease liabilities, classified as financing activities |
33,000,000
GBP
|
— |
47,000,000
GBP
|
— | — |
26,000,000
GBP
|
— |
| Cash flows from (used in) financing activities |
285,000,000
GBP
|
— |
19,000,000
GBP
|
— | — |
277,000,000
GBP
|
— |
| Increase (decrease) in cash and cash equivalents before effect of exchange rate changes |
7,586,000,000
GBP
|
— |
6,032,000,000
GBP
|
— | — |
3,913,000,000
GBP
|
— |
| Effect of exchange rate changes on cash and cash equivalents [abstract] | |||||||
| Effect of exchange rate changes on cash and cash equivalents |
14,000,000
GBP
|
— |
58,000,000
GBP
|
— | — |
69,000,000
GBP
|
— |
| Cash and cash equivalents | — |
29,181,000,000
GBP
|
— |
36,781,000,000
GBP
|
42,871,000,000
GBP
|
— |
46,715,000,000
GBP
|