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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2021
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted
Years Ended December 31,
202120202019
Basic earnings per share
Net income attributable to stockholders$10,019 $6,427 $6,732 
Less: cumulative dividends on subsidiary preferred stock(182)(180)(151)
Net income attributable to common stockholders$9,837 $6,247 $6,581 
Weighted-average common shares outstanding1,451 1,433 1,424 
Basic earnings per common share$6.78 $4.36 $4.62 
Diluted earnings per share
Net income attributable to common stockholders – diluted$9,837 $6,247 $6,581 
Weighted-average common shares outstanding – basic1,451 1,433 1,424 
Dilutive effect of warrants and awards under stock incentive plans17 9 15 
Weighted-average common shares outstanding – diluted1,468 1,442 1,439 
Diluted earnings per common share$6.70 $4.33 $4.57 
Potentially dilutive securities(a)2 7 7 
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(a) Potentially dilutive securities attributable to outstanding stock options at December 31, 2021, 2020 and 2019 and RSUs at December 31, 2020, were excluded from the computation of diluted EPS because the securities would have had an antidilutive effect.