Statement Of Cash Flows [Abstract]
| Concept |
2021-01-01 to 2021-12-31 |
2020-01-01 to 2020-12-31 |
2019-01-01 to 2019-12-31 |
|---|---|---|---|
| Statement of cash flows [abstract] | |||
| Cash flows from (used in) operating activities [abstract] | |||
| Adjustments for decrease (increase) in other assets |
324,000,000
GBP
|
340,000,000
GBP
|
247,000,000
GBP
|
| Adjustments for increase (decrease) in other liabilities |
603,000,000
GBP
|
921,000,000
GBP
|
514,000,000
GBP
|
| Cash flows from (used in) investing activities [abstract] | |||
| Purchase of property, plant and equipment, intangible assets other than goodwill, investment property and other non-current assets |
613,000,000
GBP
|
373,000,000
GBP
|
505,000,000
GBP
|
| Proceeds from disposals of property, plant and equipment, intangible assets other than goodwill, investment property and other non-current assets |
437,000,000
GBP
|
166,000,000
GBP
|
108,000,000
GBP
|
| Cash flows from (used in) financing activities [abstract] | |||
| Dividends paid to non-controlling interests, classified as financing activities |
—
GBP
|
15,000,000
GBP
|
12,000,000
GBP
|
| Proceeds from issue of bonds, notes and debentures |
2,878,000,000
GBP
|
5,614,000,000
GBP
|
4,145,000,000
GBP
|
| Repayments of bonds, notes and debentures |
11,914,000,000
GBP
|
12,037,000,000
GBP
|
7,969,000,000
GBP
|
| Payments for debt issue costs |
6,000,000
GBP
|
13,000,000
GBP
|
15,000,000
GBP
|