Disclosure Of Income Tax [Text Block]

Johnson Matthey PLC - Filing #1656103

Concept	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	As at 2022-03-31	2020-04-01 to 2021-03-31	2020-04-01 to 2021-03-31	As at 2021-03-31	2020-04-01 to 2021-03-31	2020-04-01 to 2021-03-31	2020-04-01 to 2021-03-31	2020-04-01 to 2021-03-31
Disclosure of income tax [text block]	—	—	—	—	—	—	—	—	—	—	—	—	—	—
Major components of tax expense (income) [abstract]
Tax expense (income)	—	—	—	—	—	79,000,000 GBP	—	—	—	—	—	—	—	3 0 GBP
Income tax relating to components of other comprehensive income [abstract]
Income tax relating to components of other comprehensive income	– GBP	– GBP	35,000,000 GBP	10,000,000 GBP	– GBP	2 5 GBP	—	– GBP	– GBP	—	– GBP	– GBP	28,000,000 GBP	28,000,000 GBP
Disclosure of temporary difference, unused tax losses and unused tax credits [text block]	—	—	—	—	—	—	—	—	—	—	—	—	—	—
Disclosure of temporary difference, unused tax losses and unused tax credits [abstract]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Deferred tax assets and liabilities [abstract]
Deferred tax assets	—	—	—	—	—	—	98,000,000 GBP	—	—	140,000,000 GBP	—	—	—	—
Deferred tax liabilities	—	—	—	—	—	—	18,000,000 GBP	—	—	28,000,000 GBP	—	—	—	—
Reconciliation of changes in deferred tax liability (asset) [abstract]
Changes in deferred tax liability (asset) [abstract]
Reconciliation of accounting profit multiplied by applicable tax rates [abstract]