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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2020
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted
Years Ended December 31,
202020192018
Basic earnings per share
Income from continuing operations$6,427 $6,732 $8,084 
Less: cumulative dividends on subsidiary preferred stock(180)(151)(98)
Income from continuing operations attributable to common stockholders6,247 6,581 7,986 
Loss from discontinued operations, net of tax— — 70 
Net income attributable to common stockholders$6,247 $6,581 $7,916 
Weighted-average common shares outstanding1,433 1,424 1,411 
Basic earnings per common share – continuing operations$4.36 $4.62 $5.66 
Basic loss per common share – discontinued operations$— $— $0.05 
Basic earnings per common share$4.36 $4.62 $5.61 
Diluted earnings per share
Income from continuing operations attributable to common stockholders – diluted$6,247 $6,581 $7,986 
Loss from discontinued operations, net of tax – diluted$— $— $70 
Net income attributable to common stockholders – diluted$6,247 $6,581 $7,916 
Weighted-average common shares outstanding – basic1,433 1,424 1,411 
Dilutive effect of warrants and awards under stock incentive plans9 15 20 
Weighted-average common shares outstanding – diluted1,442 1,439 1,431 
Diluted earnings per common share – continuing operations$4.33 $4.57 $5.58 
Diluted loss per common share – discontinued operations$— $— $0.05 
Diluted earnings per common share$4.33 $4.57 $5.53 
Potentially dilutive securities(a)7 7 9 
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(a) Potentially dilutive securities attributable to outstanding stock options and RSUs were excluded from the computation of diluted EPS because the securities would have had an antidilutive effect.