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Earnings Per Common Share
 12 Months Ended
Dec. 31, 2021
Earnings Per Share [Abstract]  
Earnings Per Common Share
3. EARNINGS PER COMMON SHARE
Computation of Basic and Diluted Earnings per Common Share
 For the years ended December 31,
(In millions, except for per share data)202120202019
Earnings   
Net income$2,365 $1,737 $2,085 
Less: Preferred stock dividends 21 21 21 
Net income available to common stockholders$2,344 $1,716 $2,064 
Shares
   
Weighted average common shares outstanding, basic349.1 358.3 360.9 
Dilutive effect of warrants [1]— — 0.5 
Dilutive effect of stock-based awards under compensation plans5.0 2.3 3.5 
Weighted average common shares outstanding and dilutive potential common shares [2]
354.1 360.6 364.9 
Net income available to common stockholders per common share
   
Basic
$6.71 $4.79 $5.72 
    Diluted$6.62 $4.76 $5.66 
[1]On June 26, 2019 the Capital Purchase Program warrants issued in 2009 expired.
[2]For additional information, see Note 16 - Equity and Note 20 - Stock Compensation Plans of Notes to Consolidated Financial Statements.
Basic earnings per common share is computed based on the weighted average number of common shares outstanding during the year. Diluted earnings per common share includes the dilutive effect of assumed exercise or issuance of warrants and stock-based awards under compensation plans.
Under the treasury stock method, for warrants and stock-based awards, shares are assumed to be issued and then reduced for
the number of shares repurchasable with theoretical proceeds at the average market price for the period. Contingently issuable shares are included for the number of shares issuable assuming the end of the reporting period was the end of the contingency period, if dilutive.