Statement Of Financial Position [Abstract]
| Concept |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2020-01-01 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of financial position [abstract] | ||||||||||||||||||||||||||||||||||||
| Assets [abstract] | ||||||||||||||||||||||||||||||||||||
| Non-current assets [abstract] | ||||||||||||||||||||||||||||||||||||
| Property, plant and equipment | — | — | — | — | — | — |
123,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
101,000,000
GBP
|
72,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Right-of-use assets | — | — | — | — | — | — |
187,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
163,000,000
GBP
|
91,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Trade and other non-current receivables | — | — | — | — | — | — |
44,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
24,000,000
GBP
|
26,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Deferred tax assets | — | — | — | — | — | — |
17,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
4,000,000
GBP
|
3,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Non-current assets | — | — | — | — | — | — |
2,3 25
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
1,9 2 1
GBP
|
1,8 7 0
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Current assets [abstract] | ||||||||||||||||||||||||||||||||||||
| Trade and other current receivables | — | — | — | — | — | — |
2, 068
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
1,549,000,000
GBP
|
1, 089
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Cash and cash equivalents | — | — | — | — | — | — |
784,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
656,000,000
GBP
|
676,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Current assets | — | — | — | — | — | — |
3, 125
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
2, 718
GBP
|
2, 084
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Assets | — | — | — | — | — | — |
5,450,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
4,6 3 9
GBP
|
3 ,9 5 4
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Equity and liabilities [abstract] | ||||||||||||||||||||||||||||||||||||
| Equity [abstract] | ||||||||||||||||||||||||||||||||||||
| Issued capital | — | — | — | — | — | — |
197,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
141,000,000
GBP
|
141,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Retained earnings | — | — | — | — | — | — |
2 , 76 9
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
1, 3 8 3
GBP
|
1 ,375
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Share premium | — | — | — | — | — | — |
–
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
17,000,000
GBP
|
17,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Other reserves | — | — | — | — | — | — |
1, 005
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
1, 2 4 6
GBP
|
1 ,205
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Equity attributable to owners of parent | — | — | — | — | — | — |
1 ,9 6 1
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
1,67 9
GBP
|
1,7 1 2
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Non-controlling interests | — | — | — | — | — | — |
17,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
19,000,000
GBP
|
18,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Equity |
2 6
GBP
|
2 , 76 9
GBP
|
5,000,000
GBP
|
94 6
GBP
|
–
GBP
|
38,000,000
GBP
|
1,9 7 8
GBP
|
–
GBP
|
1 ,9 6 1
GBP
|
–
GBP
|
17,000,000
GBP
|
197,000,000
GBP
|
–
GBP
|
41,000,000
GBP
|
1 , 182
GBP
|
1,3 8 3
GBP
|
4,000,000
GBP
|
19,000,000
GBP
|
1,67 9
GBP
|
141,000,000
GBP
|
1, 3 8 4
GBP
|
27,000,000
GBP
|
17,000,000
GBP
|
1,6 9 8
GBP
|
1 , 730
GBP
|
18,000,000
GBP
|
17,000,000
GBP
|
1, 3 8 4
GBP
|
1 , 730
GBP
|
1 ,375
GBP
|
1 , 182
GBP
|
12,000,000
GBP
|
16,000,000
GBP
|
141,000,000
GBP
|
5,000,000
GBP
|
1,7 1 2
GBP
|
| Liabilities [abstract] | ||||||||||||||||||||||||||||||||||||
| Non-current liabilities [abstract] | ||||||||||||||||||||||||||||||||||||
| Non-current provisions [abstract] | ||||||||||||||||||||||||||||||||||||
| Non-current provisions | — | — | — | — | — | — |
3 8
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
23,000,000
GBP
|
26,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Trade and other non-current payables | — | — | — | — | — | — |
53,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
23,000,000
GBP
|
21,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Deferred tax liabilities | — | — | — | — | — | — |
1 07
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
79,000,000
GBP
|
83,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Non-current liabilities | — | — | — | — | — | — |
1 ,230
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
992,000,000
GBP
|
927,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Current liabilities [abstract] | ||||||||||||||||||||||||||||||||||||
| Current provisions [abstract] | ||||||||||||||||||||||||||||||||||||
| Current provisions | — | — | — | — | — | — |
5,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
17,000,000
GBP
|
2 1
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Trade and other current payables | — | — | — | — | — | — |
1,9 7 7
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
1 ,451
GBP
|
1 , 030
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Current liabilities | — | — | — | — | — | — |
2,242,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
1 , 949
GBP
|
1 ,297
GBP
|
— | — | — | — | — | — | — | — | — | — | — |
| Liabilities | — | — | — | — | — | — |
3,472,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
2, 941
GBP
|
2,224,000,000
GBP
|
— | — | — | — | — | — | — | — | — | — | — |