Statement Of Comprehensive Income [Abstract]

Elisa Oyj - Filing #2196763

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	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)	2,000,000 EUR	—	3,436,000,000 EUR	3,435,000,000 EUR	3,436,000,000 EUR	3,280,000,000 EUR	3,281,000,000 EUR	1,000,000 EUR	3,280,000,000 EUR	—
Other comprehensive income [abstract]
Components of other comprehensive income that will not be reclassified to profit or loss, net of tax [abstract]
Other comprehensive income, net of tax, gains (losses) on remeasurements of defined benefit plans	—	28,000,000 EUR	28,000,000 EUR	28,000,000 EUR	—	—	45,000,000 EUR	—	45,000,000 EUR	45,000,000 EUR
Components of other comprehensive income that will be reclassified to profit or loss, net of tax [abstract]
Exchange differences on translation [abstract]
Other comprehensive income, net of tax, exchange differences on translation of foreign operations	1,000,000 EUR	—	12,000,000 EUR	12,000,000 EUR	12,000,000 EUR	32,000,000 EUR	31,000,000 EUR	1,000,000 EUR	32,000,000 EUR	—
Cash flow hedges [abstract]
Other comprehensive income, net of tax, cash flow hedges	—	9,000,000 EUR	9,000,000 EUR	9,000,000 EUR	—	—	4,000,000 EUR	—	4,000,000 EUR	4,000,000 EUR
Other comprehensive income	1,000,000 EUR	19,000,000 EUR	31,000,000 EUR	30,000,000 EUR	12,000,000 EUR	32,000,000 EUR	80,000,000 EUR	1,000,000 EUR	81,000,000 EUR	49,000,000 EUR
Comprehensive income	1,000,000 EUR	19,000,000 EUR	3,406,000,000 EUR	3,404,000,000 EUR	3,424,000,000 EUR	3,312,000,000 EUR	3,361,000,000 EUR	0 EUR	3,361,000,000 EUR	49,000,000 EUR
Comprehensive income attributable to [abstract]
Comprehensive income, attributable to owners of parent	—	—	—	3,405,000,000 EUR	—	—	3,361,000,000 EUR	—	—	—
Comprehensive income, attributable to non-controlling interests	—	—	—	1,000,000 EUR	—	—	0 EUR	—	—	—