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Earnings per Common Share
 3 Months Ended
Mar. 31, 2015
Earnings Per Share [Abstract]  
Earnings per Common Share
Earnings Per Common Share
Basic and diluted earnings per common share for the three months ended March 31, 2015 and 2014 were calculated as follows:
 
Three Months Ended March 31,
 
2015
 
2014
 
(Dollars in millions, except per share amounts, shares in thousands)
Income (Numerator):
 
 
 
Net income
$
192

 
203

Earnings applicable to non-vested restricted stock
—

 
—

Net income applicable to common stock for computing basic earnings per common share
192

 
203

Net income as adjusted for purposes of computing diluted earnings per common share
$
192

 
203

Shares (Denominator):
 
 
 
Weighted average number of shares:
 
 
 
Outstanding during period
566,687

 
578,197

Non-vested restricted stock
(4,718
)
 
(3,662
)
Weighted average shares outstanding for computing basic earnings per common share
561,969

 
574,535

Incremental common shares attributable to dilutive securities:
 
 
 
Shares issuable under convertible securities
10

 
10

Shares issuable under incentive compensation plans
1,526

 
911

Number of shares as adjusted for purposes of computing diluted earnings per common share
563,505

 
575,456

Basic earnings per common share
$
0.34

 
0.35

Diluted earnings per common share
$
0.34

 
0.35


Our calculation of diluted earnings per common share excludes shares of common stock that are issuable upon exercise of stock options when the exercise price is greater than the average market price of our common stock during the periods reflected in the table above. Such potentially issuable shares averaged 2.2 million and 3.1 million for the three months ended March 31, 2015 and 2014, respectively.