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Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Basic Earnings per Common Share |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations |  |  |  |  |  |  |  |  | $ 348 | $ 9,428 | $ 9,662
Less: cumulative dividends on GM Financial preferred stock |  |  |  |  |  |  |  |  | (16) | 0 | 0
Income from continuing operations attributable to common stockholders |  |  |  |  |  |  |  |  | 332 | 9,428 | 9,662
Income (loss) from discontinued operations, net of tax |  |  |  |  |  |  |  |  | (4,212) | (1) | 25
Net income (loss) attributable to common stockholders |  |  |  |  |  |  |  |  | $ (3,880) | $ 9,427 | $ 9,687
Weighted-average common shares outstanding - basic (in shares) |  |  |  |  |  |  |  |  | 1,465 | 1,540 | 1,586
Basic earnings per common share – continuing operations (in dollars per share) | $ (3.46) | $ 0.08 | $ 1.62 | $ 1.78 | $ 1.29 | $ 1.79 | $ 1.78 | $ 1.25 | $ 0.23 | $ 6.12 | $ 6.09
Basic earnings (loss) per common share – discontinued operations (in dollars per share) | (0.19) | (2.14) | (0.51) | (0.05) | (0.08) | 0.00 | 0.07 | 0.01 | (2.88) | 0.00 | 0.02
Basic earnings (loss) per common share (in dollars per share) |  |  |  |  |  |  |  |  | $ (2.65) | $ 6.12 | $ 6.11
Diluted earnings per share |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations attributable to common stockholders – diluted |  |  |  |  |  |  |  |  | $ 332 | $ 9,428 | $ 9,661
Income (loss) from discontinued operations, net of tax – diluted |  |  |  |  |  |  |  |  | (4,212) | (1) | 25
Net income (loss) attributable to common stockholders – diluted |  |  |  |  |  |  |  |  | $ (3,880) | $ 9,427 | $ 9,686
Weighted-average common shares outstanding - basic (in shares) |  |  |  |  |  |  |  |  | 1,465 | 1,540 | 1,586
Dilutive effect of warrants and awards under stock incentive plans (in shares) |  |  |  |  |  |  |  |  | 27 | 30 | 54
Weighted-average common shares outstanding – diluted (in shares) |  |  |  |  |  |  |  |  | 1,492 | 1,570 | 1,640
Diluted earnings per common share – continuing operations (in dollars per share) | (3.46) | 0.08 | 1.60 | 1.75 | 1.27 | 1.76 | 1.74 | 1.23 | $ 0.22 | $ 6.00 | $ 5.89
Diluted earnings (loss) per common share – discontinued operations (in dollars per share) | $ (0.19) | $ (2.11) | $ (0.51) | $ (0.05) | $ (0.08) | $ 0.00 | $ 0.07 | $ 0.01 | (2.82) | 0.00 | 0.02
Diluted earnings (loss) per common share (in dollars per share) |  |  |  |  |  |  |  |  | $ (2.60) | $ 6.00 | $ 5.91
Potentially dilutive securities (in shares) |  |  |  |  |  |  |  |  | 0 | 0 | 72

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