Statement Of Cash Flows [Abstract]
| Concept |
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 |
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 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
2022-01-01 to 2022-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
As at 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of cash flows [abstract] | ||||||||||||||||||||||||
| Cash flows from (used in) operating activities [abstract] | ||||||||||||||||||||||||
| Profit (loss) |
1,111,000,000
GBP
|
— |
1,049,000,000
GBP
|
—
GBP
|
62,000,000
GBP
|
1,049,000,000
GBP
|
—
GBP
|
—
GBP
|
— |
—
GBP
|
—
GBP
|
1,119,000,000
GBP
|
1,060,000,000
GBP
|
59,000,000
GBP
|
1,060,000,000
GBP
|
—
GBP
|
49,000,000
GBP
|
—
GBP
|
1,390,000,000
GBP
|
— |
—
GBP
|
—
GBP
|
1,439,000,000
GBP
|
1,390,000,000
GBP
|
| Adjustments to reconcile profit (loss) [abstract] | ||||||||||||||||||||||||
| Adjustments for income tax expense |
517,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
499,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
197,000,000
GBP
|
— |
| Adjustments for decrease (increase) in inventories |
131,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
292,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
17,000,000
GBP
|
— |
| Adjustments for decrease (increase) in trade accounts receivable |
38,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
85,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
14,000,000
GBP
|
— |
| Adjustments for increase (decrease) in trade accounts payable |
112,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
387,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
41,000,000
GBP
|
— |
| Adjustments for impairment loss (reversal of impairment loss) recognised in profit or loss |
200,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
143,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
1,000,000
GBP
|
— |
| Adjustments for provisions |
70,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
43,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
36,000,000
GBP
|
— |
| Adjustments for share-based payments |
76,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
15,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
—
GBP
|
— |
| Other adjustments for non-cash items |
11,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
9,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
22,000,000
GBP
|
— |
| Adjustments for losses (gains) on disposal of non-current assets |
12,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
30,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
31,000,000
GBP
|
— |
| Income taxes paid (refund), classified as operating activities |
445,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
324,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
310,000,000
GBP
|
— |
| Cash flows from (used in) operating activities |
2,100,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
2,063,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
1,356,000,000
GBP
|
— |
| Cash flows from (used in) investing activities [abstract] | ||||||||||||||||||||||||
| Cash flows used in obtaining control of subsidiaries or other businesses, classified as investing activities |
71,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
—
GBP
|
— | — | — | — | — | — | — | — | — | — |
—
GBP
|
— |
| Proceeds from sales of property, plant and equipment, classified as investing activities |
—
GBP
|
— | — | — | — | — | — | — | — | — | — |
—
GBP
|
— | — | — | — | — | — | — | — | — | — |
12,000,000
GBP
|
— |
| Purchase of property, plant and equipment, classified as investing activities |
234,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
304,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
228,000,000
GBP
|
— |
| Proceeds from sales of intangible assets, classified as investing activities |
246,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
36,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
137,000,000
GBP
|
— |
| Purchase of intangible assets, classified as investing activities |
102,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
24,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
70,000,000
GBP
|
— |
| Interest received, classified as investing activities |
27,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
19,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
16,000,000
GBP
|
— |
| Cash flows from (used in) investing activities |
134,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
8,784,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
33,000,000
GBP
|
— |
| Cash flows from (used in) financing activities [abstract] | ||||||||||||||||||||||||
| Proceeds from borrowings, classified as financing activities |
—
GBP
|
— | — | — | — | — | — | — | — | — | — |
11,004,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
8,000,000
GBP
|
— |
| Repayments of borrowings, classified as financing activities |
553,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
1,518,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
—
GBP
|
— |
| Payments of lease liabilities, classified as financing activities |
55,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
45,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
38,000,000
GBP
|
— |
| Interest paid, classified as financing activities |
404,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
163,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
15,000,000
GBP
|
— |
| Other inflows (outflows) of cash, classified as financing activities |
72,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
345,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
12,000,000
GBP
|
— |
| Cash flows from (used in) financing activities |
1,568,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
6,911,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
1,236,000,000
GBP
|
— |
| Effect of exchange rate changes on cash and cash equivalents [abstract] | ||||||||||||||||||||||||
| Effect of exchange rate changes on cash and cash equivalents |
15,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
15,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
4,000,000
GBP
|
— |
| Cash and cash equivalents | — |
1,044,000,000
GBP
|
— | — | — | — | — | — |
684,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — |
414,000,000
GBP
|
— | — | — | — |