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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Basic    
Income from continuing operations $ 1,116 $ 2,677
Less: cumulative dividends on GM Financial preferred stock (14) 0
Income from continuing operations attributable to common stockholders 1,102 2,677
Loss from discontinued operations, net of tax 70 69
Net income attributable to common stockholders $ 1,032 $ 2,608
Weighted-average common shares outstanding - basic (in shares) 1,408 1,505
Basic earnings per common share – continuing operations (in dollars per share) $ 0.78 $ 1.78
Basic loss per common share – discontinued operations (in dollars per share) 0.05 0.05
Basic earnings per common share (in dollars per share) $ 0.73 $ 1.73
Diluted    
Income from continuing operations attributable to common stockholders – diluted $ 1,102 $ 2,677
Loss from discontinued operations, net of tax – diluted 70 69
Net income attributable to common stockholders – diluted $ 1,032 $ 2,608
Weighted-average common shares outstanding - basic (in shares) 1,408 1,505
Dilutive effect of warrants and awards under stock incentive plans 22 27
Weighted-average common shares outstanding - diluted (in shares) 1,430 1,532
Diluted earnings per common share – continuing operations (in dollars per share) $ 0.77 $ 1.75
Diluted loss per common share – discontinued operations (in dollars per share) 0.05 0.05
Diluted earnings per common share (in dollars per share) $ 0.72 $ 1.70
Potentially dilutive securities (in shares) 4 0