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Nature of Operations and Basis of Presentation (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Jan. 01, 2018
Dec. 31, 2017
Income Statement        
Automotive net sales and revenue $ 32,691 $ 34,519    
Automotive cost of sales 30,184 29,761    
Income before income taxes 1,576 3,473    
Net income attributable to stockholders 1,046 $ 2,608    
Balance Sheet        
Equipment on operating leases, net (Note 7; Note 9 at VIEs) 43,444     $ 42,882
Deferred income taxes 23,538   $ 23,925 23,544
Other assets 5,169   5,366 4,929
Accrued liabilities 27,330   28,324 25,996
Other liabilities 11,945   12,159 12,394
Retained earnings 17,028   16,581 17,627
Accumulated other comprehensive loss (8,081)   (8,109) (8,011)
GM Financial [Member]        
Balance Sheet        
GM Financial short-term debt and current portion of long-term debt 25,006   24,437 $ 24,450
Accounting Standards Update 2014-09 [Member]        
Income Statement        
Automotive net sales and revenue 32,691      
Automotive cost of sales 30,184      
Income before income taxes 1,576      
Net income attributable to stockholders 1,046      
Balance Sheet        
Equipment on operating leases, net (Note 7; Note 9 at VIEs) 789      
Deferred income taxes 23,538   444  
Other assets     195  
Accrued liabilities 27,330   2,328  
Other liabilities 11,945   (235)  
Retained earnings 17,028   (1,336)  
Accumulated other comprehensive loss     0  
Accounting Standards Update 2014-09 [Member] | GM Financial [Member]        
Balance Sheet        
GM Financial short-term debt and current portion of long-term debt     0  
Accounting Standards Update 2016-01 [Member]        
Newly Adopted Accounting Standard, Modified Retrospective Basis [Abstract]        
Cumulative effect adjustment     182  
Accounting Standards Update 2017-12 and Accounting Standards Update 2018-02 [Member]        
Newly Adopted Accounting Standard, Modified Retrospective Basis [Abstract]        
Cumulative effect adjustment 108      
Accounting Standards Update 2016-01, Accounting Standards Update 2017-12 and Accounting Standards Update 2018-02 [Member]        
Balance Sheet        
Deferred income taxes     (63)  
Other assets     242  
Accrued liabilities     0  
Other liabilities     0  
Retained earnings     290  
Accumulated other comprehensive loss     (98)  
Accounting Standards Update 2016-01, Accounting Standards Update 2017-12 and Accounting Standards Update 2018-02 [Member] | GM Financial [Member]        
Balance Sheet        
GM Financial short-term debt and current portion of long-term debt     $ (13)  
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member]        
Income Statement        
Automotive net sales and revenue 1,133      
Automotive cost of sales 719      
Income before income taxes 445      
Net income attributable to stockholders 344      
Balance Sheet        
Equipment on operating leases, net (Note 7; Note 9 at VIEs) (706)      
Deferred income taxes 343      
Accrued liabilities 1,217      
Other liabilities (246)      
Retained earnings (991)      
Calculated under Revenue Guidance in Effect before Topic 606 [Member]        
Income Statement        
Automotive net sales and revenue 31,558      
Automotive cost of sales 29,465      
Income before income taxes 1,131      
Net income attributable to stockholders 702      
Balance Sheet        
Equipment on operating leases, net (Note 7; Note 9 at VIEs) 1,495      
Deferred income taxes 23,195      
Accrued liabilities 26,113      
Other liabilities 12,191      
Retained earnings $ 18,019