Analysis Of Income And Expense [Abstract]
| Concept |
2021-09-19 to 2022-09-30 |
2021-09-19 to 2022-09-17 |
2021-09-19 to 2022-09-17 |
2021-09-19 to 2022-09-17 |
2021-09-19 to 2022-09-17 |
2021-09-19 to 2022-09-17 |
2021-09-19 to 2022-09-17 |
2021-09-19 to 2022-09-17 |
2021-09-19 to 2022-09-17 |
2020-09-19 to 2021-09-30 |
2020-09-13 to 2021-09-18 |
2020-09-13 to 2021-09-18 |
2020-09-13 to 2021-09-18 |
2020-09-13 to 2021-09-18 |
2020-09-13 to 2021-09-18 |
2020-09-13 to 2021-09-18 |
2020-09-13 to 2021-09-18 |
2020-09-13 to 2021-09-18 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Analysis of income and expense [abstract] | ||||||||||||||||||
| Revenue [abstract] | ||||||||||||||||||
| Revenue | — | — | — | — | — | — |
16,997,000,000
GBP
|
— | — | — | — | — | — | — |
13,884,000,000
GBP
|
— | — | — |
| Material income and expense [abstract] | ||||||||||||||||||
| Gains (losses) on disposals of non-current assets [abstract] | ||||||||||||||||||
| Gains (losses) on disposals of non-current assets | — | — | — | — | — | — |
7,000,000
GBP
|
— | — | — | — | — | — | — |
4,000,000
GBP
|
— | — | — |
| Finance income (cost) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Other finance income (cost) | — | — | — | — | — | — |
13,000,000
GBP
|
— | — | — | — | — | — | — |
1,000,000
GBP
|
— | — | — |
| Miscellaneous other comprehensive income [abstract] | ||||||||||||||||||
| Other comprehensive income, net of tax, exchange differences on translation of foreign operations and hedges of net investments in foreign operations [abstract] | ||||||||||||||||||
| Other comprehensive income, net of tax, hedges of net investments in foreign operations | — |
–
GBP
|
1,000,000
GBP
|
1,000,000
GBP
|
–
GBP
|
–
GBP
|
1,000,000
GBP
|
–
GBP
|
–
GBP
|
— |
–
GBP
|
14,000,000
GBP
|
–
GBP
|
–
GBP
|
14,000,000
GBP
|
14,000,000
GBP
|
–
GBP
|
–
GBP
|
| 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 |
440,000,000
GBP
|
–
GBP
|
429,000,000
GBP
|
429,000,000
GBP
|
–
GBP
|
11,000,000
GBP
|
440,000,000
GBP
|
–
GBP
|
–
GBP
|
355,000,000
GBP
|
–
GBP
|
355,000,000
GBP
|
–
GBP
|
–
GBP
|
355,000,000
GBP
|
355,000,000
GBP
|
–
GBP
|
–
GBP
|
| Share of profit (loss) of associates and joint ventures accounted for using equity method [abstract] | ||||||||||||||||||
| Share of profit (loss) of associates and joint ventures accounted for using equity method | — | — | — | — | — | — |
109,000,000
GBP
|
— | — | — | — | — | — | — |
79,000,000
GBP
|
— | — | — |
| Share of other comprehensive income of associates and joint ventures accounted for using equity method, net of tax [abstract] | ||||||||||||||||||
| Share of other comprehensive income of associates and joint ventures accounted for using equity method that will be reclassified to profit or loss, net of tax |
28,000,000
GBP
|
–
GBP
|
28,000,000
GBP
|
28,000,000
GBP
|
–
GBP
|
–
GBP
|
28,000,000
GBP
|
–
GBP
|
–
GBP
|
10,000,000
GBP
|
–
GBP
|
10,000,000
GBP
|
–
GBP
|
–
GBP
|
10,000,000
GBP
|
10,000,000
GBP
|
–
GBP
|
–
GBP
|
| Income tax relating to components of other comprehensive income [abstract] | ||||||||||||||||||
| Income tax relating to components of other comprehensive income that will be reclassified to profit or loss | — | — | — | — | — | — |
1,000,000
GBP
|
— | — | — | — | — | — | — |
–
GBP
|
— | — | — |
| Comprehensive income, continuing and discontinued operations [abstract] | ||||||||||||||||||
| Comprehensive income | — |
391,000,000
GBP
|
456,000,000
GBP
|
2,219,000,000
GBP
|
1,369,000,000
GBP
|
31,000,000
GBP
|
2,250,000,000
GBP
|
3,000,000
GBP
|
–
GBP
|
— |
–
GBP
|
357,000,000
GBP
|
–
GBP
|
25,000,000
GBP
|
599,000,000
GBP
|
579,000,000
GBP
|
911,000,000
GBP
|
20,000,000
GBP
|
| Comprehensive income attributable to owners of parent, continuing and discontinued operations [abstract] | ||||||||||||||||||
| Comprehensive income, attributable to owners of parent | — | — | — | — | — | — |
2,219,000,000
GBP
|
— | — | — | — | — | — | — |
579,000,000
GBP
|
— | — | — |
| Comprehensive income attributable to non-controlling interests, continuing and discontinued operations [abstract] | ||||||||||||||||||
| Comprehensive income, attributable to non-controlling interests | — | — | — | — | — | — |
31,000,000
GBP
|
— | — | — | — | — | — | — |
20,000,000
GBP
|
— | — | — |