Analysis Of Income And Expense [Abstract]
| Concept |
2021-03-28 to 2022-04-02 |
2021-03-28 to 2022-04-02 |
2021-03-28 to 2022-04-02 |
2021-03-28 to 2022-04-02 |
2021-03-28 to 2022-04-02 |
2021-03-28 to 2022-04-02 |
2021-03-28 to 2022-04-02 |
2020-03-29 to 2021-03-27 |
2020-03-29 to 2021-03-27 |
2020-03-29 to 2021-03-27 |
2020-03-29 to 2021-03-27 |
2020-03-29 to 2021-03-27 |
2020-03-29 to 2021-03-27 |
2020-03-29 to 2021-03-27 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Analysis of income and expense [abstract] | ||||||||||||||
| Revenue [abstract] | ||||||||||||||
| Revenue |
2,826,000,000
GBP
|
— | — | — | — | — | — | — | — |
2,344,000,000
GBP
|
— | — | — | — |
| Material income and expense [abstract] | ||||||||||||||
| Finance income (cost) |
32,000,000
GBP
|
— | — | — | — | — | — | — | — |
31,000,000
GBP
|
— | — | — | — |
| Other finance cost |
1,000,000
GBP
|
— | — | — | — | — | — | — | — |
1,000,000
GBP
|
— | — | — | — |
| Operating expense |
1,468,000,000
GBP
|
— | — | — | — | — | — | — | — |
1,1 41
GBP
|
— | — | — | — |
| Miscellaneous other comprehensive income [abstract] | ||||||||||||||
| Other comprehensive income, before tax, exchange differences on translation of foreign operations and hedges of net investments in foreign operations [abstract] | ||||||||||||||
| Other comprehensive income, before tax, exchange differences on translation of foreign operations |
22,000,000
GBP
|
22,000,000
GBP
|
–
GBP
|
22,000,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
51,000,000
GBP
|
–
GBP
|
51,000,000
GBP
|
51,000,000
GBP
|
–
GBP
|
| Income tax relating to exchange differences on translation of foreign operations and hedges of net investments in foreign operations included in other comprehensive income [abstract] | ||||||||||||||
| Income tax relating to exchange differences on translation of foreign operations included in other comprehensive income |
–
GBP
|
— | — | — | — | — | — | — | — |
2,000,000
GBP
|
— | — | — | — |
| Income tax relating to components of other comprehensive income [abstract] | ||||||||||||||
| Income tax relating to components of other comprehensive income | — | — | — | — | — | — | — |
–
GBP
|
–
GBP
|
2,000,000
GBP
|
–
GBP
|
2,000,000
GBP
|
2,000,000
GBP
|
–
GBP
|
| Comprehensive income, continuing and discontinued operations [abstract] | ||||||||||||||
| Comprehensive income |
418,000,000
GBP
|
21,000,000
GBP
|
–
GBP
|
417,000,000
GBP
|
3 96
GBP
|
–
GBP
|
1,000,000
GBP
|
–
GBP
|
–
GBP
|
328,000,000
GBP
|
–
GBP
|
49,000,000
GBP
|
328,000,000
GBP
|
377,000,000
GBP
|
| Comprehensive income attributable to owners of parent, continuing and discontinued operations [abstract] | ||||||||||||||
| Comprehensive income, attributable to owners of parent |
417,000,000
GBP
|
— | — | — | — | — | — | — | — |
328,000,000
GBP
|
— | — | — | — |
| Comprehensive income attributable to non-controlling interests, continuing and discontinued operations [abstract] | ||||||||||||||
| Comprehensive income, attributable to non-controlling interests |
1,000,000
GBP
|
— | — | — | — | — | — | — | — |
–
GBP
|
— | — | — | — |