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Stockholders' Equity and Noncontrolling Interests Preferred and Common Stock (Details)
$ / shares in Units, shares in Millions, $ in Millions
 1 Months Ended 12 Months Ended
Sep. 30, 2017
USD ($)
$ / shares
Dec. 31, 2017
USD ($)
Votes
$ / shares
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2015
USD ($)
$ / shares
shares
Class of Stock [Line Items]        
Preferred stock shares authorized | shares   2,000    
Common stock shares authorized | shares   5,000    
Common stock number of shares issued | shares   1,400 1,500  
Common stock shares outstanding | shares   1,400 1,500  
Dividends declared per common share (in dollars per share) | $ / shares   $ 1.52 $ 1.52 $ 1.38
Cash dividends paid on common stock | $   $ 2,215 $ 2,337 $ 2,174
Number of votes per share | Votes   1    
Common shares purchased during period | shares   120 77 102
Amount of common stock purchased during period | $   $ 4,492 $ 2,500 $ 3,520
Issuance of GM Financial preferred stock | $   $ 985    
GM Financial [Member] | Series A Preferred Stock [Member]        
Class of Stock [Line Items]        
Issuance of GM Financial preferred stock | $ $ 1,000      
Preferred stock par value (in dollars per share) | $ / shares $ 0.01      
Liquidation preference of preferred stock per share (in dollars per share) | $ / shares $ 1,000      
Preferred stock dividend rate 5.75%      
Annual dividend amount | $ $ 58      
Term of fixed rate dividends of preferred stock dividend payments 10 years