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Earnings Per Share
 9 Months Ended
Sep. 30, 2021
Earnings Per Share [Abstract]  
Earnings Per Share Earnings Per Share
Three Months EndedNine Months Ended
September 30, 2021September 30, 2020September 30, 2021September 30, 2020
Basic earnings per share
Net income attributable to stockholders$2,420 $4,045 $8,278 $3,581 
Less: cumulative dividends on subsidiary preferred stock(45)(40)(137)(135)
Net income attributable to common stockholders$2,375 $4,005 $8,141 $3,446 
Weighted-average common shares outstanding1,452 1,432 1,450 1,432 
Basic earnings per common share$1.64 $2.80 $5.61 $2.41 
Diluted earnings per share
Net income attributable to common stockholders – diluted$2,375 $4,005 $8,141 $3,446 
Weighted-average common shares outstanding – basic1,452 1,432 1,450 1,432 
Dilutive effect of awards under stock incentive plans15 7 17 7 
Weighted-average common shares outstanding – diluted1,467 1,439 1,467 1,439 
Diluted earnings per common share$1.62 $2.78 $5.55 $2.40 
Potentially dilutive securities(a)2 31 2 31 
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(a)Potentially dilutive securities attributable to outstanding stock options and Restricted Stock Units (RSUs) at September 30, 2021 and 2020 were excluded from the computation of diluted earnings per share (EPS) because the securities would have had an antidilutive effect.