Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2025	May 08, 2025
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2025
Document Fiscal Year Focus	2025
Document Fiscal Period Focus	Q1
Document Quarterly Report	true
Document Transition Report	false
Trading Symbol	LAC
Entity Registrant Name	LITHIUM AMERICAS CORP.
Entity Central Index Key	0001966983
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Incorporation, State or Country Code	A1
Entity Shell Company	false
Entity File Number	001-41788
Entity Tax Identification Number	00-0000000
Entity Address, Address Line One	3260 – 666 Burrard Street
Entity Address, City or Town	Vancouver
Entity Address, State or Province	BC
Entity Address, Postal Zip Code	V6C 2X8
Entity Address, Country	CA
City Area Code	778
Local Phone Number	656-5820
Title of 12(b) Security	Common Shares
Security Exchange Name	NYSE
Entity Common Stock, Shares Outstanding		218,904,876