Analysis Of Income And Expense [Abstract]
| Concept |
2022-04-01 to 2023-03-31 |
2022-04-01 to 2023-03-31 |
2022-04-01 to 2023-03-31 |
2022-04-01 to 2023-03-31 |
2022-04-01 to 2023-03-31 |
2022-04-01 to 2023-03-31 |
2022-04-01 to 2023-03-31 |
2022-04-01 to 2023-03-31 |
2022-04-01 to 2023-03-31 |
2022-04-01 to 2023-03-31 |
2022-04-01 to 2023-03-31 |
2021-04-01 to 2022-03-31 |
2021-04-01 to 2022-03-31 |
2021-04-01 to 2022-03-31 |
2021-04-01 to 2022-03-31 |
2021-04-01 to 2022-03-31 |
2021-04-01 to 2022-03-31 |
2021-04-01 to 2022-03-31 |
2021-04-01 to 2022-03-31 |
2021-04-01 to 2022-03-31 |
2021-04-01 to 2022-03-31 |
2021-04-01 to 2022-03-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Analysis of income and expense [abstract] | ||||||||||||||||||||||
| Revenue [abstract] | ||||||||||||||||||||||
| Revenue | — | — | — |
–
GBP
|
418,000,000
GBP
|
— | — | — | — | — |
418,000,000
GBP
|
— | — | — | — | — | — | — |
412,000,000
GBP
|
432,000,000
GBP
|
20,000,000
GBP
|
— |
| Material income and expense [abstract] | ||||||||||||||||||||||
| Finance income (cost) | — | — | — |
88,000,000
GBP
|
60,000,000
GBP
|
— | — | — | — | — |
28,000,000
GBP
|
— | — | — | — | — | — | — |
5,000,000
GBP
|
55,000,000
GBP
|
60,000,000
GBP
|
— |
| Share of profit (loss) of associates and joint ventures accounted for using equity method [abstract] | ||||||||||||||||||||||
| Share of profit (loss) of joint ventures accounted for using equity method | — | — | — |
559,000,000
GBP
|
92,000,000
GBP
|
— | — | — | — | — |
467,000,000
GBP
|
— | — | — | — | — | — | — |
247,000,000
GBP
|
84,000,000
GBP
|
16 3
GBP
|
— |
| Share of profit (loss) of associates and joint ventures accounted for using equity method | — | — | — |
559,000,000
GBP
|
92,000,000
GBP
|
— | — | — | — | — |
467,000,000
GBP
|
— | — | — | — | — | — | — |
247,000,000
GBP
|
84,000,000
GBP
|
163,000,000
GBP
|
— |
| Comprehensive income, continuing and discontinued operations [abstract] | ||||||||||||||||||||||
| Comprehensive income |
10,000,000
GBP
|
1,028,000,000
GBP
|
–
GBP
|
— | — |
–
GBP
|
–
GBP
|
1,038,000,000
GBP
|
1,000,000
GBP
|
–
GBP
|
1,029,000,000
GBP
|
952,000,000
GBP
|
–
GBP
|
2,000,000
GBP
|
963,000,000
GBP
|
–
GBP
|
–
GBP
|
12,000,000
GBP
|
954,000,000
GBP
|
— | — |
1,000,000
GBP
|
| Comprehensive income attributable to owners of parent, continuing and discontinued operations [abstract] | ||||||||||||||||||||||
| Comprehensive income, attributable to owners of parent | — | — | — | — | — | — | — | — | — | — |
1,028,000,000
GBP
|
— | — | — | — | — | — | — |
952,000,000
GBP
|
— | — | — |
| Comprehensive income attributable to non-controlling interests, continuing and discontinued operations [abstract] | ||||||||||||||||||||||
| Comprehensive income, attributable to non-controlling interests | — | — | — | — | — | — | — | — | — | — |
1,000,000
GBP
|
— | — | — | — | — | — | — |
2,000,000
GBP
|
— | — | — |