Analysis Of Income And Expense [Abstract]

Johnson Matthey PLC - Filing #2043544

Concept	2023-04-01 to 2024-03-31	2023-04-01 to 2024-03-31	2023-04-01 to 2024-03-31	2023-04-01 to 2024-03-31	2023-04-01 to 2024-03-31	2023-04-01 to 2024-03-31	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
Analysis of income and expense [abstract]
Revenue [abstract]
Revenue	—	12,843,000,000 GBP	—	—	—	—	—	—	—	—	—	14,933,000,000 GBP
Material income and expense [abstract]
Gains (losses) on disposals of investments [abstract]
Gains (losses) on disposals of investments	—	9,000,000 GBP	—	—	—	—	—	—	—	—	—	12,000,000 GBP
Gains (losses) on litigation settlements [abstract]
Gains (losses) on litigation settlements	—	– GBP	—	—	—	—	—	—	—	—	—	25,000,000 GBP
Investment income	—	64,000,000 GBP	—	—	—	—	—	—	—	—	—	49,000,000 GBP
Expenses by nature [abstract]
Depreciation, amortisation and impairment loss (reversal of impairment loss) recognised in profit or loss [abstract]
Depreciation and amortisation expense [abstract]
Amortisation expense	—	4,000,000 GBP	—	—	—	—	—	—	—	—	—	5,000,000 GBP
Disclosure of attribution of expenses by nature to their function [text block]	—	—	—	—	—	—	—	—	—	—	—	—
Disclosure of attribution of expenses by nature to their function [abstract]
Disclosure of attribution of expenses by nature to their function [line items]
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, exchange differences on translation of foreign operations	79,000,000 GBP	79,000,000 GBP	– GBP	– GBP	– GBP	– GBP	– GBP	– GBP	1,000,000 GBP	– GBP	– GBP	1,000,000 GBP
Other comprehensive income, net of tax, hedges of net investments in foreign operations	4,000,000 GBP	4,000,000 GBP	– GBP	– GBP	– GBP	– GBP	– GBP	– GBP	10,000,000 GBP	– GBP	– GBP	10,000,000 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, hedges of net investments in foreign operations	—	4,000,000 GBP	—	—	—	—	—	—	—	—	—	10,000,000 GBP
Share of profit (loss) of associates and joint ventures accounted for using equity method [abstract]
Share of profit (loss) of associates accounted for using equity method	—	3,000,000 GBP	—	—	—	—	—	—	—	—	—	1,000,000 GBP
Income tax relating to components of other comprehensive income [abstract]
Income tax relating to components of other comprehensive income that will not be reclassified to profit or loss	—	18,000,000 GBP	—	—	—	—	—	—	—	—	—	37,000,000 GBP
Income tax relating to components of other comprehensive income that will be reclassified to profit or loss	—	1,000,000 GBP	—	—	—	—	—	—	—	—	—	28,000,000 GBP
Income tax relating to components of other comprehensive income	1,000,000 GBP	1 9 GBP	– GBP	– GBP	– GBP	18,000,000 GBP	– GBP	– GBP	28,000,000 GBP	37,000,000 GBP	– GBP	9,000,000 GBP
Comprehensive income, continuing and discontinued operations [abstract]
Comprehensive income from continuing operations	—	24,000,000 GBP	—	—	—	—	—	—	—	—	—	249,000,000 GBP
Comprehensive income from discontinued operations	—	– GBP	—	—	—	—	—	—	—	—	—	20,000,000 GBP
Comprehensive income	82,000,000 GBP	24,000,000 GBP	– GBP	– GBP	– GBP	58,000,000 GBP	– GBP	– GBP	65,000,000 GBP	164,000,000 GBP	– GBP	229,000,000 GBP