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Earnings Per Share
 6 Months Ended
Jun. 30, 2021
Earnings Per Share [Abstract]  
Earnings Per Share Earnings Per Share
Three Months EndedSix Months Ended
June 30, 2021June 30, 2020June 30, 2021June 30, 2020
Basic earnings per share
Net income (loss) attributable to stockholders$2,836 $(758)$5,858 $(464)
Less: cumulative dividends on subsidiary preferred stock(46)(48)(91)(95)
Net income (loss) attributable to common stockholders$2,790 $(806)$5,767 $(559)
Weighted-average common shares outstanding1,451 1,432 1,449 1,432 
Basic earnings (loss) per common share$1.92 $(0.56)$3.98 $(0.39)
Diluted earnings per share
Net income (loss) attributable to common stockholders – diluted$2,790 $(806)$5,767 $(559)
Weighted-average common shares outstanding – basic1,451 1,432 1,449 1,432 
Dilutive effect of awards under stock incentive plans17 — 17 — 
Weighted-average common shares outstanding – diluted1,468 1,432 1,466 1,432 
Diluted earnings (loss) per common share$1.90 $(0.56)$3.93 $(0.39)
Potentially dilutive securities(a)2 43 2 43 
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(a)Potentially dilutive securities attributable to outstanding stock options at June 30, 2021 and 2020 and Performance Stock Units (PSUs) and Restricted Stock Units (RSUs) at June 30, 2020, were excluded from the computation of diluted earnings per share (EPS) because the securities would have had an antidilutive effect.