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Significant Accounting Policies - Impact of New Accounting Pronouncements (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jan. 01, 2018
Income Statement                        
Automotive net sales and revenue                 $ 133,045      
Automotive and other cost of sales                 120,656 $ 116,229 $ 121,784  
Income before income taxes                 8,549 11,863 12,008  
Net income (loss) attributable to stockholders $ 2,044 $ 2,534 $ 2,390 $ 1,046 $ (5,151) $ (2,981) $ 1,660 $ 2,608 8,014 (3,864) $ 9,427  
Balance Sheet                        
Equipment on operating leases, net (Note 7) 247       1,106       247 1,106    
Deferred income taxes (Note 17) 24,082       23,544       24,082 23,544   $ 23,925
Other assets 5,770       4,929       5,770 4,929   5,366
Accrued liabilities (Note 12) 28,049       25,996       28,049 25,996   28,324
Other liabilities (Note 12) 12,357       12,394       12,357 12,394   12,159
Retained earnings 22,322       17,627       22,322 17,627   16,581
Accumulated other comprehensive loss (9,039)       (8,011)       (9,039) (8,011)   (8,109)
GM Financial [Member]                        
Balance Sheet                        
Short-term debt and current portion of long-term debt (Note 13) 30,956       $ 24,450       30,956 $ 24,450   24,437
Accounting Standards Update 2014-09 [Member]                        
Income Statement                        
Automotive net sales and revenue                 133,045      
Automotive and other cost of sales                 120,656      
Income before income taxes                 8,549      
Net income (loss) attributable to stockholders                 8,014      
Balance Sheet                        
Equipment on operating leases, net (Note 7) 247               247      
Deferred income taxes (Note 17) 24,082               24,082     444
Other assets                       195
Accrued liabilities (Note 12) 28,049               28,049     2,328
Other liabilities (Note 12) 12,357               12,357     (235)
Retained earnings 22,322               22,322     (1,336)
Accumulated other comprehensive loss                       0
Accounting Standards Update 2014-09 [Member] | GM Financial [Member]                        
Balance Sheet                        
Short-term debt and current portion of long-term debt (Note 13)                       0
Accounting Standards Update 2016-01 [Member]                        
Newly Adopted Accounting Standard, Modified Retrospective Basis [Abstract]                        
Adoption of accounting standards (Note 2)                       182
Accounting Standards Update 2017-12 and Accounting Standards Update 2018-02 [Member]                        
Newly Adopted Accounting Standard, Modified Retrospective Basis [Abstract]                        
Adoption of accounting standards (Note 2)       $ 108                
Accounting Standards Update 2016-01, Accounting Standards Update 2017-12 and Accounting Standards Update 2018-02 [Member]                        
Balance Sheet                        
Deferred income taxes (Note 17)                       (63)
Other assets                       242
Accrued liabilities (Note 12)                       0
Other liabilities (Note 12)                       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                        
Short-term debt and current portion of long-term debt (Note 13)                       $ (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                 944      
Automotive and other cost of sales                 1,021      
Income before income taxes                 121      
Net income (loss) attributable to stockholders                 108      
Balance Sheet                        
Equipment on operating leases, net (Note 7) (935)               (935)      
Deferred income taxes (Note 17) 430               430      
Accrued liabilities (Note 12) 1,506               1,506      
Other liabilities (Note 12) (435)               (435)      
Retained earnings (1,228)               (1,228)      
Calculated under Revenue Guidance in Effect before Topic 606 [Member]                        
Income Statement                        
Automotive net sales and revenue                 132,101      
Automotive and other cost of sales                 119,635      
Income before income taxes                 8,428      
Net income (loss) attributable to stockholders                 7,906      
Balance Sheet                        
Equipment on operating leases, net (Note 7) 1,182               1,182      
Deferred income taxes (Note 17) 23,652               23,652      
Accrued liabilities (Note 12) 26,543               26,543      
Other liabilities (Note 12) 12,792               12,792      
Retained earnings $ 23,550               $ 23,550