Analysis Of Income And Expense [Abstract]

Aperam S.A. - Filing #4417767

Concept	2021-01-01 to 2021-12-31	2021-01-01 to 2021-12-31	2021-01-01 to 2021-12-31	2021-01-01 to 2021-12-31	2021-01-01 to 2021-12-31	2021-01-01 to 2021-12-31	2021-01-01 to 2021-12-31	2020-01-01 to 2020-12-31	2020-01-01 to 2020-12-31	2020-01-01 to 2020-12-31	2020-01-01 to 2020-12-31	2020-01-01 to 2020-12-31	2020-01-01 to 2020-12-31
Analysis of income and expense [abstract]
Revenue [abstract]
Revenue from sale of goods	—	—	—	—	—	5,102,000,000 EUR	—	—	3,624,000,000 EUR	—	—	—	—
Material income and expense [abstract]
Write-downs (reversals of write-downs) of inventories [abstract]
Write-downs (reversals of write-downs) of inventories	—	—	—	—	—	10,000,000 EUR	—	—	12,000,000 EUR	—	—	—	—
Selling, general and administrative expense [abstract]
Selling, general and administrative expense	—	—	—	—	—	191,000,000 EUR	—	—	169,000,000 EUR	—	—	—	—
Expenses by nature [abstract]
Depreciation, amortisation and impairment loss (reversal of impairment loss) recognised in profit or loss [abstract]
Depreciation, amortisation and impairment loss (reversal of impairment loss) recognised in profit or loss	—	—	—	—	—	144,000,000 EUR	—	—	144,000,000 EUR	—	—	—	—
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	—	—	—	—	—	5,000,000 EUR	—	—	255,000,000 EUR	—	—	—	—
Income tax relating to exchange differences on translation of foreign operations and hedges of net investments in foreign operations included in other comprehensive income [abstract]
Income tax relating to exchange differences on translation of foreign operations included in other comprehensive income	—	—	—	—	—	nil EUR	—	—	nil EUR	—	—	—	—
Comprehensive income, continuing and discontinued operations [abstract]
Comprehensive income	1,000,000 EUR	1,000,000 EUR	5,000,000 EUR	15,000,000 EUR	987,000,000 EUR	988,000,000 EUR	968,000,000 EUR	175,000,000 EUR	77,000,000 EUR	255,000,000 EUR	77,000,000 EUR	5,000,000 EUR	2,000,000 EUR
Comprehensive income attributable to owners of parent, continuing and discontinued operations [abstract]
Comprehensive income, attributable to owners of parent	—	—	—	—	—	987,000,000 EUR	—	—	77,000,000 EUR	—	—	—	—
Comprehensive income attributable to non-controlling interests, continuing and discontinued operations [abstract]
Comprehensive income, attributable to non-controlling interests	—	—	—	—	—	1,000,000 EUR	—	—	— EUR	—	—	—	—