Analysis Of Income And Expense [Abstract]

Johnson Matthey PLC - Filing #1895979

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	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	14,933,000,000 GBP	—	—	—	—	—	—	—	—	—	—	16,025,000,000 GBP
Material income and expense [abstract]
Gains (losses) on disposals of investments [abstract]
Gains (losses) on disposals of investments	12,000,000 GBP	—	—	—	—	—	—	—	—	—	—	106,000,000 GBP
Gains (losses) on litigation settlements [abstract]
Gains (losses) on litigation settlements	25,000,000 GBP	—	—	—	—	—	—	—	—	—	—	42,000,000 GBP
Investment income	49,000,000 GBP	—	—	—	—	—	—	—	—	—	—	4 1 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	5,000,000 GBP	—	—	—	—	—	—	—	—	—	—	6,000,000 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	1,000,000 GBP	1,000,000 GBP	– GBP	– GBP	– GBP	– GBP	– GBP	– GBP	– GBP	80,000,000 GBP	– GBP	80,000,000 GBP
Other comprehensive income, net of tax, hedges of net investments in foreign operations	1 0 GBP	1 0 GBP	– GBP	– GBP	– GBP	– GBP	– GBP	– GBP	– GBP	2,000,000 GBP	– GBP	2,000,000 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	10,000,000 GBP	—	—	—	—	—	—	—	—	—	—	2,000,000 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	1,000,000 GBP	—	—	—	—	—	—	—	—	—	—	– 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	37,000,000 GBP	—	—	—	—	—	—	—	—	—	—	35,000,000 GBP
Income tax relating to components of other comprehensive income that will be reclassified to profit or loss	28,000,000 GBP	—	—	—	—	—	—	—	—	—	—	10,000,000 GBP
Income tax relating to components of other comprehensive income	9,000,000 GBP	2 8 GBP	– GBP	– GBP	37,000,000 GBP	– GBP	– GBP	– GBP	35,000,000 GBP	10,000,000 GBP	– GBP	25,000,000 GBP
Comprehensive income, continuing and discontinued operations [abstract]
Comprehensive income from continuing operations	249,000,000 GBP	—	—	—	—	—	—	—	—	—	—	300,000,000 GBP
Comprehensive income from discontinued operations	20,000,000 GBP	—	—	—	—	—	—	—	—	—	—	212,000,000 GBP
Comprehensive income	229,000,000 GBP	65,000,000 GBP	– GBP	– GBP	164,000,000 GBP	– GBP	– GBP	– GBP	41,000,000 GBP	47,000,000 GBP	– GBP	88,000,000 GBP