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Nature of Operations and Basis of Presentation (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Mar. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Income Statement              
Automotive net sales and revenue $ 33,275 $ 33,998 $ 65,966 $ 68,517      
Automotive and other cost of sales 30,071 29,535 60,255 59,296      
Income before income taxes 2,885 2,967 4,461 6,440      
Net income attributable to stockholders 2,390 $ 1,660 3,436 $ 4,268      
Balance Sheet              
Equipment on operating leases, net (Note 7; Note 9 at VIEs) 44,054   44,054       $ 42,882
Deferred income taxes 23,285   23,285     $ 23,925 23,544
Other assets 5,344   5,344     5,366 4,929
Accrued liabilities 27,368   27,368     28,324 25,996
Other liabilities 11,876   11,876     12,159 12,394
Retained earnings 18,873   18,873     16,581 17,627
Accumulated other comprehensive loss (8,171)   (8,171)     (8,109) (8,011)
GM Financial [Member]              
Balance Sheet              
GM Financial short-term debt and current portion of long-term debt 25,457   25,457     24,437 $ 24,450
Accounting Standards Update 2014-09 [Member]              
Income Statement              
Automotive net sales and revenue 33,275   65,966        
Automotive and other cost of sales 30,071   60,255        
Income before income taxes 2,885   4,461        
Net income attributable to stockholders 2,390   3,436        
Balance Sheet              
Equipment on operating leases, net (Note 7; Note 9 at VIEs) 690   690        
Deferred income taxes 23,285   23,285     444  
Other assets           195  
Accrued liabilities 27,368   27,368     2,328  
Other liabilities 11,876   11,876     (235)  
Retained earnings 18,873   18,873     (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 (168)   964        
Automotive and other cost of sales 311   1,030        
Income before income taxes (324)   121        
Net income attributable to stockholders (239)   105        
Balance Sheet              
Equipment on operating leases, net (Note 7; Note 9 at VIEs) (988)   (988)        
Deferred income taxes 427   427        
Accrued liabilities 1,426   1,426        
Other liabilities (406)   (406)        
Retained earnings (1,231)   (1,231)        
Calculated under Revenue Guidance in Effect before Topic 606 [Member]              
Income Statement              
Automotive net sales and revenue 33,443   65,002        
Automotive and other cost of sales 29,760   59,225        
Income before income taxes 3,209   4,340        
Net income attributable to stockholders 2,629   3,331        
Balance Sheet              
Equipment on operating leases, net (Note 7; Note 9 at VIEs) 1,678   1,678        
Deferred income taxes 22,858   22,858        
Accrued liabilities 25,942   25,942        
Other liabilities 12,282   12,282        
Retained earnings $ 20,104   $ 20,104