v2.4.0.8
Document and Entity Information Document (USD $)
In Billions, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Jan. 28, 2015
Jun. 30, 2014
Document Entity Information [Abstract]      
Entity Registrant Name GENERAL MOTORS COMPANY    
Entity Central Index Key 0001467858    
Current Fiscal Year End Date --12-31    
Entity Filer Category Large Accelerated Filer    
Document Type 10-K    
Document Fiscal Year Focus 2014    
Document Fiscal Period Focus FY    
Document Period End Date Dec. 31, 2014    
Amendment Flag false    
Entity Common Stock, Shares Outstanding   1,610,365,961  
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Public Float     $ 58.2