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Cover Page - shares
 9 Months Ended
Sep. 30, 2019
Oct. 15, 2019
Cover page.    
Document Type 10-Q  
Document Period End Date Sep. 30, 2019  
Document Quarterly Report true  
Document Transition Report false  
Entity File Number 001-34960  
Entity Registrant Name GENERAL MOTORS COMPANY  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 27-0756180  
Entity Address, Address Line One 300 Renaissance Center,  
Entity Address, City or Town Detroit,  
Entity Address, State or Province MI  
Entity Address, Postal Zip Code 48265  
City Area Code 313  
Local Phone Number 667-1500  
Entity Central Index Key 0001467858  
Title of 12(b) Security Common Stock, $0.01 par value  
Trading Symbol GM  
Security Exchange Name NYSE  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   1,428,784,056
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q3  
Amendment Flag false  
Current Fiscal Year End Date --12-31