Statement Of Cash Flows [Abstract]
| Concept |
2024-01-01 to 2024-01-31 |
2023-01-01 to 2023-12-31 |
2023-01-01 to 2023-12-31 |
As at 2023-12-31 |
2023-05-01 to 2023-05-31 |
As at 2022-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
2022-03-01 to 2022-03-31 |
As at 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-03-01 to 2021-03-31 |
As at 2020-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of cash flows [abstract] | ||||||||||||||
| Cash flows from (used in) operating activities [abstract] | ||||||||||||||
| Interest paid, classified as operating activities | — |
8,871,000,000
GBP
|
— | — | — | — |
2,357,000,000
GBP
|
— | — | — | — |
1,668,000,000
GBP
|
— | — |
| Interest received, classified as operating activities | — |
20,345,000,000
GBP
|
— | — | — | — |
12,638,000,000
GBP
|
— | — | — | — |
9,696,000,000
GBP
|
— | — |
| Income taxes paid (refund), classified as operating activities | — |
1,033,000,000
GBP
|
— | — | — | — |
1,223,000,000
GBP
|
— | — | — | — |
856,000,000
GBP
|
— | — |
| Cash flows from (used in) operating activities | — |
17,438,000,000
GBP
|
— | — | — | — |
43,597,000,000
GBP
|
— | — | — | — |
53,684,000,000
GBP
|
— | — |
| Cash flows from (used in) investing activities [abstract] | ||||||||||||||
| Proceeds from sales of property, plant and equipment, classified as investing activities | — |
128,000,000
GBP
|
— | — | — | — |
154,000,000
GBP
|
— | — | — | — |
165,000,000
GBP
|
— | — |
| Purchase of property, plant and equipment, classified as investing activities | — |
811,000,000
GBP
|
— | — | — | — |
639,000,000
GBP
|
— | — | — | — |
901,000,000
GBP
|
— | — |
| Interest received, classified as investing activities | — |
1,099,000,000
GBP
|
— | — | — | — |
659,000,000
GBP
|
— | — | — | — |
581,000,000
GBP
|
— | — |
| Cash flows from (used in) investing activities | — |
14,694,000,000
GBP
|
— | — | — | — |
19,059,000,000
GBP
|
— | — | — | — |
3,065,000,000
GBP
|
— | — |
| Cash flows from (used in) financing activities [abstract] | ||||||||||||||
| Proceeds from issuing other equity instruments | — |
-
GBP
|
— | — | — | — |
-
GBP
|
— | — | — | — |
937,000,000
GBP
|
— | — |
| Payments to acquire or redeem entity's shares |
4,900,000
GBP
|
2,416,000,000
GBP
|
1,151,700,000
GBP
|
— |
1,300,000,000
GBP
|
— |
2,054,000,000
GBP
|
829,300,000
GBP
|
1,200,000,000
GBP
|
— |
676,200,000
GBP
|
1,806,000,000
GBP
|
1,100,000,000
GBP
|
— |
| Dividends paid, classified as financing activities | — |
1,703,000,000
GBP
|
— | — | — | — |
3,205,000,000
GBP
|
— | — | — | — |
1,016,000,000
GBP
|
— | — |
| Cash flows from (used in) financing activities | — |
6,304,000,000
GBP
|
— | — | — | — |
10,652,000,000
GBP
|
— | — | — | — |
2,601,000,000
GBP
|
— | — |
| Effect of exchange rate changes on cash and cash equivalents [abstract] | ||||||||||||||
| Effect of exchange rate changes on cash and cash equivalents | — |
1,189,000,000
GBP
|
— | — | — | — |
2,933,000,000
GBP
|
— | — | — | — |
2,641,000,000
GBP
|
— | — |
| Increase (decrease) in cash and cash equivalents after effect of exchange rate changes | — |
39,625,000,000
GBP
|
— | — | — | — |
32,257,000,000
GBP
|
— | — | — | — |
51,507,000,000
GBP
|
— | — |
| Cash and cash equivalents | — | — | — |
118,824,000,000
GBP
|
— |
158,449,000,000
GBP
|
— | — | — |
190,706,000,000
GBP
|
— | — | — |
139,199,000,000
GBP
|