Statement Of Cash Flows [Abstract]
| Concept |
2021-01-01 to 2021-12-31 |
2020-01-01 to 2020-12-31 |
|---|---|---|
| Statement of cash flows [abstract] | ||
| Cash flows from (used in) operating activities [abstract] | ||
| Profit (loss) |
2,907,000,000
GBP
|
536,000,000
GBP
|
| Adjustments to reconcile profit (loss) [abstract] | ||
| Adjustments for provisions |
388,000,000
GBP
|
189,000,000
GBP
|
| Adjustments for unrealised foreign exchange losses (gains) |
1,120,000,000
GBP
|
758,000,000
GBP
|
| Other adjustments for non-cash items |
87,000,000
GBP
|
146,000,000
GBP
|
| Interest paid, classified as operating activities |
693,000,000
GBP
|
1,092,000,000
GBP
|
| Interest received, classified as operating activities |
6,623,000,000
GBP
|
6,736,000,000
GBP
|
| Income taxes paid (refund), classified as operating activities |
923,000,000
GBP
|
170,000,000
GBP
|
| Cash flows from (used in) operating activities |
37,816,000,000
GBP
|
29,231,000,000
GBP
|
| Cash flows from (used in) investing activities [abstract] | ||
| Proceeds from sales of property, plant and equipment, classified as investing activities |
58,000,000
GBP
|
319,000,000
GBP
|
| Purchase of property, plant and equipment, classified as investing activities |
876,000,000
GBP
|
344,000,000
GBP
|
| Dividends received, classified as investing activities |
—
GBP
|
—
GBP
|
| Cash flows from (used in) investing activities |
2,972,000,000
GBP
|
4,113,000,000
GBP
|
| Cash flows from (used in) financing activities [abstract] | ||
| Proceeds from issuing other equity instruments |
941,000,000
GBP
|
—
GBP
|
| Dividends paid, classified as financing activities |
1,714,000,000
GBP
|
152,000,000
GBP
|
| Cash flows from (used in) financing activities |
1,212,000,000
GBP
|
817,000,000
GBP
|
| Effect of exchange rate changes on cash and cash equivalents [abstract] | ||
| Effect of exchange rate changes on cash and cash equivalents |
979,000,000
GBP
|
621,000,000
GBP
|
| Increase (decrease) in cash and cash equivalents after effect of exchange rate changes |
38,597,000,000
GBP
|
34,782,000,000
GBP
|