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Earnings Per Share (Tables)
 3 Months Ended
Mar. 31, 2021
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share Basic and Diluted
Three Months Ended
March 31, 2021March 31, 2020
Basic earnings per share
Net income attributable to stockholders$3,022 $294 
Less: cumulative dividends on subsidiary preferred stock(46)(47)
Net income attributable to common stockholders$2,976 $247 
Weighted-average common shares outstanding1,447 1,433 
Basic earnings per common share$2.06 $0.17 
Diluted earnings per share
Net income attributable to common stockholders – diluted$2,976 $247 
Weighted-average common shares outstanding – basic1,447 1,433 
Dilutive effect of awards under stock incentive plans17 7 
Weighted-average common shares outstanding – diluted1,464 1,440 
Diluted earnings per common share$2.03 $0.17 
Potentially dilutive securities(a)2 32 
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(a)Potentially dilutive securities attributable to outstanding stock options at March 31, 2021 and 2020 and Restricted Stock Units (RSUs) at March 31, 2020, were excluded from the computation of diluted earnings per share (EPS) because the securities would have had an antidilutive effect.