v2.4.0.6
Document and Entity Information Document (USD $)
12 Months Ended
Dec. 31, 2012
Feb. 08, 2013
Jun. 30, 2012
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 Period End Date Dec. 31, 2012    
Document Fiscal Year Focus 2012    
Document Fiscal Period Focus Q4    
Amendment Flag false    
Entity Common Stock, Shares Outstanding   1,366,443,296  
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Public Float     $ 30,874,344,760