Note 14. Commitments and Contingencies (Details) - Solar Module Collection and Recycling Liability - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Commitments and Contingencies Disclosure [Abstract]
Accrued solar module collection and recycling liability	$ 146,017	$ 134,394
Solar module collection and recycling expense, accretion expense	$ 6,200	$ 5,800	$ 5,500

Solar module collection and recycling expense, accretion expense

No definition available.

Name:	fslr_Solarmodulecollectionandrecyclingexpenseaccretionexpense
Namespace Prefix:	fslr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration