Document and Entity Information Document - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Feb. 05, 2019	Jun. 30, 2018
Document and Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	FY
Trading Symbol	acf
Entity Registrant Name	General Motors Financial Company, Inc.
Entity Central Index Key	0000804269
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		5,050,000
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 0
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Shell Company	false