Cover Page - shares	9 Months Ended
	Sep. 30, 2020	Nov. 04, 2020
Document and Entity Information [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2020
Document Transition Report	false
Entity File Number	1-10667
Entity Registrant Name	General Motors Financial Company, Inc.
Entity Incorporation, State or Country Code	TX
Entity Tax Identification Number	75-2291093
Entity Address, Address Line One	801 Cherry Street
Entity Address, Address Line Two	Suite 3500
Entity Address, City or Town	Fort Worth
Entity Address, State or Province	TX
Entity Address, Postal Zip Code	76102
City Area Code	817
Local Phone Number	302-7000
Title of 12(b) Security	5.250% Senior Notes due 2026
Trading Symbol	GM/26
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		5,050,000
Entity Central Index Key	0000804269
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q3