Statement Of Comprehensive Income [Abstract]

Telia Company - Filing #703319

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	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	2020-01-01 to 2020-12-31	2020-01-01 to 2020-12-31
Statement of comprehensive income [abstract]
Profit (loss)	156,000,000 SEK	—	—	—	—	11 680 SEK	11 836 SEK	11 680 SEK	22 993 SEK	22 837 SEK	—	156,000,000 SEK	—	22 993 SEK	—	—
Other comprehensive income [abstract]
Components of other comprehensive income that will not be reclassified to profit or loss, before tax [abstract]
Other comprehensive income, before tax, gains (losses) from investments in equity instruments	—	—	—	—	—	—	126,000,000 SEK	—	—	63,000,000 SEK	—	—	—	—	—	—
Other comprehensive income, before tax, gains (losses) on remeasurements of defined benefit plans	—	—	—	—	—	—	6 654 SEK	—	—	7 166 SEK	—	—	—	—	—	—
Share of other comprehensive income of associates and joint ventures accounted for using equity method that will not be reclassified to profit or loss, before tax	—	—	—	—	—	—	—	—	—	12,000,000 SEK	—	—	—	—	—	—
Components of other comprehensive income that will be reclassified to profit or loss, before tax [abstract]
Cash flow hedges [abstract]
Gains (losses) on cash flow hedges, before tax	—	—	—	—	—	—	61,000,000 SEK	—	—	14,000,000 SEK	—	—	—	—	—	—
Cost of hedging [abstract]
Change in value of foreign currency basis spreads [abstract]
Gains (losses) on change in value of foreign currency basis spreads, before tax	—	—	—	—	—	—	143,000,000 SEK	—	—	100,000,000 SEK	—	—	—	—	—	—
Financial assets measured at fair value through other comprehensive income [abstract]
Gains (losses) on financial assets measured at fair value through other comprehensive income, before tax	—	—	—	—	—	—	40,000,000 SEK	—	—	32,000,000 SEK	—	—	—	—	—	—
Share of other comprehensive income of associates and joint ventures accounted for using equity method that will be reclassified to profit or loss, before tax	—	—	—	—	—	—	—	—	—	111,000,000 SEK	—	—	—	—	—	—
Income tax relating to components of other comprehensive income that will not be reclassified to profit or loss [abstract]
Income tax relating to components of other comprehensive income that will not be reclassified to profit or loss	—	—	—	—	—	—	1 360 SEK	—	—	1 457 SEK	—	—	—	—	—	—
Income tax relating to components of other comprehensive income that will be reclassified to profit or loss [abstract]
Income tax relating to components of other comprehensive income that will be reclassified to profit or loss	—	—	—	—	—	—	52,000,000 SEK	—	—	125,000,000 SEK	—	—	—	—	—	—
Other comprehensive income	25,000,000 SEK	114,000,000 SEK	48,000,000 SEK	95,000,000 SEK	3 090 SEK	8 641 SEK	8 666 SEK	5 294 SEK	5 720 SEK	5 433 SEK	11 487 SEK	255,000,000 SEK	8,000,000 SEK	5 688 SEK	89,000,000 SEK	160,000,000 SEK
Comprehensive income	181,000,000 SEK	114,000,000 SEK	48,000,000 SEK	95,000,000 SEK	3 090 SEK	20 321 SEK	20 502 SEK	16 974 SEK	28 713 SEK	17 405 SEK	11 487 SEK	99,000,000 SEK	8,000,000 SEK	17 307 SEK	89,000,000 SEK	160,000,000 SEK
Comprehensive income attributable to [abstract]
Comprehensive income, attributable to owners of parent	—	—	—	—	—	—	20 321 SEK	—	—	17 307 SEK	—	—	—	—	—	—
Comprehensive income, attributable to non-controlling interests	—	—	—	—	—	—	181,000,000 SEK	—	—	99,000,000 SEK	—	—	—	—	—	—