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Nature of Operations and Basis of Presentation (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Mar. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Income Statement              
Income before income taxes $ 2,630 $ 2,430 $ 7,091 $ 8,870      
Net income attributable to stockholders 2,534 $ (2,981) 5,970 $ 1,287      
Balance Sheet              
Equipment on operating leases, net (Note 7) 474   474       $ 1,106
Deferred income taxes 23,242   23,242     $ 23,925 23,544
Other assets 5,946   5,946     5,366 4,929
Accrued liabilities 28,104   28,104     28,324 25,996
Other liabilities 12,261   12,261     12,159 12,394
Retained earnings 20,865   20,865     16,581 17,627
Accumulated other comprehensive loss (8,321)   (8,321)     (8,109) (8,011)
GM Financial [Member]              
Balance Sheet              
GM Financial short-term debt and current portion of long-term debt 27,950   27,950     24,437 $ 24,450
Accounting Standards Update 2014-09 [Member]              
Income Statement              
Automotive net sales and revenue 32,276   98,242        
Automotive and other cost of sales     88,788        
Income before income taxes 2,630   7,091        
Net income attributable to stockholders 2,534   5,970        
Balance Sheet              
Equipment on operating leases, net (Note 7) 474   474        
Deferred income taxes 23,242   23,242     444  
Other assets           195  
Accrued liabilities 28,104   28,104     2,328  
Other liabilities 12,261   12,261     (235)  
Retained earnings 20,865   20,865     (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 (683)   281        
Automotive and other cost of sales     1,039        
Income before income taxes (691)   (570)        
Net income attributable to stockholders (537)   (432)        
Balance Sheet              
Equipment on operating leases, net (Note 7) (954)   (954)        
Deferred income taxes 581   581        
Accrued liabilities 2,141   2,141        
Other liabilities (396)   (396)        
Retained earnings (1,768)   (1,768)        
Calculated under Revenue Guidance in Effect before Topic 606 [Member]              
Income Statement              
Automotive net sales and revenue 32,959   97,961        
Automotive and other cost of sales     87,749        
Income before income taxes 3,321   7,661        
Net income attributable to stockholders 3,071   6,402        
Balance Sheet              
Equipment on operating leases, net (Note 7) 1,428   1,428        
Deferred income taxes 22,661   22,661        
Accrued liabilities 25,963   25,963        
Other liabilities 12,657   12,657        
Retained earnings $ 22,633   $ 22,633