Statement Of Comprehensive Income [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
Statement of comprehensive income [abstract]
Profit (loss)	1,000,000 EUR	—	—	—	968,000,000 EUR	969,000,000 EUR	968,000,000 EUR	175,000,000 EUR	175,000,000 EUR	—	175,000,000 EUR	—	—
Other comprehensive income [abstract]
Income tax relating to components of other comprehensive income that will not be reclassified to profit or loss [abstract]
Income tax relating to remeasurements of defined benefit plans included in other comprehensive income	—	—	—	—	—	6,000,000 EUR	—	—	1,000,000 EUR	—	—	—	—
Income tax relating to components of other comprehensive income that will be reclassified to profit or loss [abstract]
Income tax relating to exchange differences on translation of foreign operations included in other comprehensive income	—	—	—	—	—	nil EUR	—	—	nil EUR	—	—	—	—
Income tax relating to cash flow hedges included in other comprehensive income	—	—	—	—	—	6,000,000 EUR	—	—	2,000,000 EUR	—	—	—	—
Other comprehensive income	—	1,000,000 EUR	5,000,000 EUR	15,000,000 EUR	19,000,000 EUR	19,000,000 EUR	—	—	252,000,000 EUR	255,000,000 EUR	252,000,000 EUR	5,000,000 EUR	2,000,000 EUR
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 [abstract]
Comprehensive income, attributable to owners of parent	—	—	—	—	—	987,000,000 EUR	—	—	77,000,000 EUR	—	—	—	—
Comprehensive income, attributable to non-controlling interests	—	—	—	—	—	1,000,000 EUR	—	—	— EUR	—	—	—	—