Analysis Of Income And Expense [Abstract]

Fortum Oyj - Filing #3292332

Concept	2024-01-01 to 2024-12-31	2024-01-01 to 2024-12-31	2024-01-01 to 2024-12-31	2024-01-01 to 2024-12-31	2024-01-01 to 2024-12-31	2024-01-01 to 2024-12-31	2024-01-01 to 2024-12-31	2024-01-01 to 2024-12-31	2023-01-01 to 2023-12-31	2023-01-01 to 2023-12-31	2023-01-01 to 2023-12-31	2023-01-01 to 2023-12-31	2023-01-01 to 2023-12-31	2023-01-01 to 2023-12-31	2023-01-01 to 2023-12-31	2023-01-01 to 2023-12-31
Analysis of income and expense [abstract]
Revenue [abstract]
Revenue	—	5 800 EUR	—	—	—	—	—	—	—	—	—	6 711 EUR	—	—	—	—
Material income and expense [abstract]
Income from continuing operations attributable to owners of parent	—	1 164 EUR	—	—	—	—	—	—	—	—	—	1 514 EUR	—	—	—	—
Income from discontinued operations attributable to owners of parent	—	— EUR	—	—	—	—	—	—	—	—	—	3 583 EUR	—	—	—	—
Profit (loss) from continuing operations attributable to non-controlling interests	—	4,000,000 EUR	—	—	—	—	—	—	—	—	—	1,000,000 EUR	—	—	—	—
Profit (loss) from discontinued operations attributable to non-controlling interests	—	— EUR	—	—	—	—	—	—	—	—	—	1,000,000 EUR	—	—	—	—
Finance income (cost)	—	55,000,000 EUR	—	—	—	—	—	—	—	—	—	138,000,000 EUR	—	—	—	—
Other finance income (cost)	—	47,000,000 EUR	—	—	—	—	—	—	—	—	—	34,000,000 EUR	—	—	—	—
Interest expense	—	226,000,000 EUR	—	—	—	—	—	—	—	—	—	269,000,000 EUR	—	—	—	—
Expenses by nature [abstract]
Classes of employee benefits expense [abstract]
Employee benefits expense	—	485,000,000 EUR	—	—	—	—	—	—	—	—	—	436,000,000 EUR	—	—	—	—
Depreciation, amortisation and impairment loss (reversal of impairment loss) recognised in profit or loss [abstract]
Depreciation and amortisation expense [abstract]
Depreciation and amortisation expense	—	379,000,000 EUR	—	—	—	—	—	—	—	—	—	359,000,000 EUR	—	—	—	—
Impairment loss (reversal of impairment loss) recognised in profit or loss	—	17,000,000 EUR	—	—	—	—	—	—	—	—	—	0 EUR	—	—	—	—
Other expenses, by nature	—	511,000,000 EUR	—	—	—	—	—	—	—	—	—	595,000,000 EUR	—	—	—	—
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]
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 hedges of net investments in foreign operations included in other comprehensive income	—	1,000,000 EUR	—	—	—	—	—	—	—	—	—	3,000,000 EUR	—	—	—	—
Share of profit (loss) of associates and joint ventures accounted for using equity method [abstract]
Share of profit (loss) of associates and joint ventures accounted for using equity method	—	19,000,000 EUR	—	—	—	—	—	—	—	—	—	59,000,000 EUR	—	—	—	—
Share of other comprehensive income of associates and joint ventures accounted for using equity method, net of tax [abstract]
Share of other comprehensive income of associates and joint ventures accounted for using equity method that will be reclassified to profit or loss, net of tax	—	1,000,000 EUR	—	—	—	—	—	—	—	—	—	17,000,000 EUR	—	—	—	—
Comprehensive income, continuing and discontinued operations [abstract]
Comprehensive income	4,000,000 EUR	1 659 EUR	0 EUR	465,000,000 EUR	1 164 EUR	15,000,000 EUR	19,000,000 EUR	1 663 EUR	14,000,000 EUR	2 006 EUR	2 069 EUR	1 581 EUR	186,000,000 EUR	1 844 EUR	1,000,000 EUR	1 580 EUR
Comprehensive income attributable to owners of parent, continuing and discontinued operations [abstract]
Comprehensive income, attributable to owners of parent	—	1 663 EUR	—	—	—	—	—	—	—	—	—	1 580 EUR	—	—	—	—
Comprehensive income attributable to non-controlling interests, continuing and discontinued operations [abstract]
Comprehensive income, attributable to non-controlling interests	—	4,000,000 EUR	—	—	—	—	—	—	—	—	—	1,000,000 EUR	—	—	—	—