Statement Of Cash Flows [Abstract]
| Concept |
2024-01-01 to 2024-12-31 |
2024-01-01 to 2024-12-31 |
As at 2024-12-31 |
2024-01-01 to 2024-12-31 |
2024-01-01 to 2024-12-31 |
2024-01-01 to 2024-12-31 |
2024-01-01 to 2024-12-31 |
2023-01-01 to 2023-12-31 |
As at 2023-12-31 |
2023-01-01 to 2023-12-31 |
2023-01-01 to 2023-12-31 |
2023-01-01 to 2023-12-31 |
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 |
As at 2021-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of cash flows [abstract] | ||||||||||||||||||
| Cash flows from (used in) operating activities [abstract] | ||||||||||||||||||
| Profit (loss) |
30,000,000
GBP
|
1,283,000,000
GBP
|
— | — | — |
1,253,000,000
GBP
|
1,253,000,000
GBP
|
1,725,000,000
GBP
|
— |
22,000,000
GBP
|
1,703,000,000
GBP
|
1,703,000,000
GBP
|
— |
563,000,000
GBP
|
553,000,000
GBP
|
563,000,000
GBP
|
10,000,000
GBP
|
— |
| Adjustments to reconcile profit (loss) [abstract] | ||||||||||||||||||
| Adjustments for provisions | — |
78,000,000
GBP
|
— | — | — | — | — |
132,000,000
GBP
|
— | — | — | — | — | — |
192,000,000
GBP
|
— | — | — |
| Adjustments for unrealised foreign exchange losses (gains) | — |
4,883,000,000
GBP
|
— | — | — | — | — |
4,426,000,000
GBP
|
— | — | — | — | — | — |
6,761,000,000
GBP
|
— | — | — |
| Adjustments for share-based payments | — |
61,000,000
GBP
|
— | — | — | — | — |
58,000,000
GBP
|
— | — | — | — | — | — |
46,000,000
GBP
|
— | — | — |
| Adjustments for fair value losses (gains) | — |
45,000,000
GBP
|
— | — | — | — | — |
62,000,000
GBP
|
— | — | — | — | — | — |
427,000,000
GBP
|
— | — | — |
| Other adjustments for non-cash items | — |
180,000,000
GBP
|
— | — | — | — | — |
165,000,000
GBP
|
— | — | — | — | — | — |
16,000,000
GBP
|
— | — | — |
| Dividends received, classified as operating activities | — |
—
GBP
|
— | — | — | — | — |
15,000,000
GBP
|
— | — | — | — | — | — |
7,000,000
GBP
|
— | — | — |
| Interest paid, classified as operating activities | — |
20,978,000,000
GBP
|
— | — | — | — | — |
17,267,000,000
GBP
|
— | — | — | — | — | — |
5,284,000,000
GBP
|
— | — | — |
| Interest received, classified as operating activities | — |
22,160,000,000
GBP
|
— | — | — | — | — |
19,288,000,000
GBP
|
— | — | — | — | — | — |
7,668,000,000
GBP
|
— | — | — |
| Income taxes paid (refund), classified as operating activities | — |
1,088,000,000
GBP
|
— | — | — | — | — |
140,000,000
GBP
|
— | — | — | — | — | — |
845,000,000
GBP
|
— | — | — |
| Cash flows from (used in) operating activities | — |
5,809,000,000
GBP
|
— | — | — | — | — |
3,630,000,000
GBP
|
— | — | — | — | — | — |
32,190,000,000
GBP
|
— | — | — |
| Cash flows from (used in) investing activities [abstract] | ||||||||||||||||||
| Cash flows from losing control of subsidiaries or other businesses, classified as investing activities | — |
8,631,000,000
GBP
|
— |
667,000,000
GBP
|
8,600,000,000
GBP
|
— | — |
394,000,000
GBP
|
— | — | — | — | — | — |
—
GBP
|
— | — | — |
| Cash flows used in obtaining control of subsidiaries or other businesses, classified as investing activities | — |
955,000,000
GBP
|
— | — | — | — | — |
1,161,000,000
GBP
|
— | — | — | — | — | — |
29,000,000
GBP
|
— | — | — |
| Cash flows from (used in) investing activities | — |
19,066,000,000
GBP
|
— | — | — | — | — |
12,800,000,000
GBP
|
— | — | — | — | — | — |
7,186,000,000
GBP
|
— | — | — |
| Cash flows from (used in) financing activities [abstract] | ||||||||||||||||||
| Cash flows from (used in) financing activities | — |
4,326,000,000
GBP
|
— | — | — | — | — |
169,000,000
GBP
|
— | — | — | — | — | — |
1,902,000,000
GBP
|
— | — | — |
| Increase (decrease) in cash and cash equivalents before effect of exchange rate changes | — |
8,931,000,000
GBP
|
— | — | — | — | — |
9,001,000,000
GBP
|
— | — | — | — | — | — |
41,278,000,000
GBP
|
— | — | — |
| Effect of exchange rate changes on cash and cash equivalents [abstract] | ||||||||||||||||||
| Effect of exchange rate changes on cash and cash equivalents | — |
5,178,000,000
GBP
|
— | — | — | — | — |
3,869,000,000
GBP
|
— | — | — | — | — | — |
7,706,000,000
GBP
|
— | — | — |
| Cash and cash equivalents | — | — |
162,928,000,000
GBP
|
— | — | — | — | — |
177,037,000,000
GBP
|
— | — | — |
189,907,000,000
GBP
|
— | — | — | — |
140,923,000,000
GBP
|