Statement Of Cash Flows [Abstract]
| Concept |
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 |
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 |
2021-01-01 to 2021-12-31 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
As at 2020-12-31 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of cash flows [abstract] | |||||||||||||||||||||||||||
| Cash flows from (used in) operating activities [abstract] | |||||||||||||||||||||||||||
| Profit (loss) | — |
–
GBP
|
–
GBP
|
1,119,000,000
GBP
|
1,060,000,000
GBP
|
59,000,000
GBP
|
1,060,000,000
GBP
|
–
GBP
|
–
GBP
|
49,000,000
GBP
|
–
GBP
|
1,390,000,000
GBP
|
— |
–
GBP
|
–
GBP
|
–
GBP
|
1,439,000,000
GBP
|
1,390,000,000
GBP
|
1,181,000,000
GBP
|
1,145,000,000
GBP
|
–
GBP
|
— |
–
GBP
|
–
GBP
|
36,000,000
GBP
|
–
GBP
|
1,145,000,000
GBP
|
| Adjustments to reconcile profit (loss) [abstract] | |||||||||||||||||||||||||||
| Adjustments for income tax expense | — | — | — |
499,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
197,000,000
GBP
|
— |
410,000,000
GBP
|
— | — | — | — | — | — | — | — |
| Adjustments for decrease (increase) in inventories | — | — | — |
292,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
17,000,000
GBP
|
— |
130,000,000
GBP
|
— | — | — | — | — | — | — | — |
| Adjustments for decrease (increase) in trade accounts receivable | — | — | — |
85,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
14,000,000
GBP
|
— |
18,000,000
GBP
|
— | — | — | — | — | — | — | — |
| Adjustments for increase (decrease) in trade accounts payable | — | — | — |
387,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
41,000,000
GBP
|
— |
140,000,000
GBP
|
— | — | — | — | — | — | — | — |
| Adjustments for impairment loss (reversal of impairment loss) recognised in profit or loss | — | — | — |
143,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
1,000,000
GBP
|
— |
88,000,000
GBP
|
— | — | — | — | — | — | — | — |
| Adjustments for provisions | — | — | — |
43,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
36,000,000
GBP
|
— |
27,000,000
GBP
|
— | — | — | — | — | — | — | — |
| Adjustments for fair value losses (gains) | — | — | — |
–
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
–
GBP
|
— |
91,000,000
GBP
|
— | — | — | — | — | — | — | — |
| Other adjustments for non-cash items | — | — | — |
24,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
22,000,000
GBP
|
— |
100,000,000
GBP
|
— | — | — | — | — | — | — | — |
| Adjustments for losses (gains) on disposal of non-current assets | — | — | — |
30,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
31,000,000
GBP
|
— |
209,000,000
GBP
|
— | — | — | — | — | — | — | — |
| Income taxes paid (refund), classified as operating activities | — | — | — |
324,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
310,000,000
GBP
|
— |
554,000,000
GBP
|
— | — | — | — | — | — | — | — |
| Cash flows from (used in) operating activities | — | — | — |
2,063,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
1,356,000,000
GBP
|
— |
1,407,000,000
GBP
|
— | — | — | — | — | — | — | — |
| Cash flows from (used in) investing activities [abstract] | |||||||||||||||||||||||||||
| Cash flows from losing control of subsidiaries or other businesses, classified as investing activities | — | — | — |
–
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
–
GBP
|
— |
221,000,000
GBP
|
— | — | — | — | — | — | — | — |
| Cash flows used in obtaining control of subsidiaries or other businesses, classified as investing activities | — | — | — |
–
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
–
GBP
|
— |
20,000,000
GBP
|
— | — | — | — | — | — | — | — |
| Proceeds from sales of property, plant and equipment, classified as investing activities | — | — | — |
–
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
12,000,000
GBP
|
— |
6,000,000
GBP
|
— | — | — | — | — | — | — | — |
| Purchase of property, plant and equipment, classified as investing activities | — | — | — |
304,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
228,000,000
GBP
|
— |
222,000,000
GBP
|
— | — | — | — | — | — | — | — |
| Proceeds from sales of intangible assets, classified as investing activities | — | — | — |
36,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
137,000,000
GBP
|
— |
924,000,000
GBP
|
— | — | — | — | — | — | — | — |
| Purchase of intangible assets, classified as investing activities | — | — | — |
24,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
70,000,000
GBP
|
— |
96,000,000
GBP
|
— | — | — | — | — | — | — | — |
| Interest received, classified as investing activities | — | — | — |
19,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
16,000,000
GBP
|
— |
19,000,000
GBP
|
— | — | — | — | — | — | — | — |
| Cash flows from (used in) investing activities | — | — | — |
8,784,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
33,000,000
GBP
|
— |
1,030,000,000
GBP
|
— | — | — | — | — | — | — | — |
| Cash flows from (used in) financing activities [abstract] | |||||||||||||||||||||||||||
| Proceeds from borrowings, classified as financing activities | — | — | — |
11,004,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
8,000,000
GBP
|
— |
38,000,000
GBP
|
— | — | — | — | — | — | — | — |
| Repayments of borrowings, classified as financing activities | — | — | — |
1,518,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
–
GBP
|
— |
10,000,000
GBP
|
— | — | — | — | — | — | — | — |
| Payments of lease liabilities, classified as financing activities | — | — | — |
45,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
38,000,000
GBP
|
— |
44,000,000
GBP
|
— | — | — | — | — | — | — | — |
| Interest paid, classified as financing activities | — | — | — |
163,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
15,000,000
GBP
|
— |
19,000,000
GBP
|
— | — | — | — | — | — | — | — |
| Other inflows (outflows) of cash, classified as financing activities | — | — | — |
345,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
12,000,000
GBP
|
— |
–
GBP
|
— | — | — | — | — | — | — | — |
| Cash flows from (used in) financing activities | — | — | — |
6,911,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — |
1,236,000,000
GBP
|
— |
2,437,000,000
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
|
— | — | — | — | — | — | — | — | — | — | — | — |
4,000,000
GBP
|
— |
6,000,000
GBP
|
— | — | — | — | — | — | — | — |
| Cash and cash equivalents |
684,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
414,000,000
GBP
|
— | — | — | — | — | — | — | — |
333,000,000
GBP
|
— | — | — | — | — |