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Earnings per Common Share
 9 Months Ended
Sep. 30, 2014
Earnings Per Share [Abstract]  
Earnings per Common Share
Earnings (Loss) Per Common Share
Basic and diluted earnings (loss) per common share for the three and nine months ended September 30, 2014 and 2013 were calculated as follows:
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2014
 
2013
 
2014
 
2013
 
(Dollars in millions, except per share amounts, shares in thousands)
Income (Loss) (Numerator):
 
 
 
 
 
 
 
Net income (loss)
$
188

 
(1,045
)
 
584

 
(478
)
Earnings applicable to non-vested restricted stock
—

 
—

 
—

 
—

Net income (loss) applicable to common stock for computing basic earnings (loss) per common share
188

 
(1,045
)
 
584

 
(478
)
Net income (loss) as adjusted for purposes of computing diluted earnings (loss) per common share
$
188

 
(1,045
)
 
584

 
(478
)
Shares (Denominator):
 
 
 
 
 
 
 
Weighted average number of shares:
 
 
 
 
 
 
 
Outstanding during period
570,545

 
598,350

 
573,661

 
609,542

Non-vested restricted stock
(4,580
)
 
(3,763
)
 
(4,189
)
 
(3,438
)
Weighted average shares outstanding for computing basic earnings (loss) per common share
565,965

 
594,587

 
569,472

 
606,104

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

 
—

 
10

 
—

Shares issuable under incentive compensation plans
1,457

 
—

 
1,158

 
—

Number of shares as adjusted for purposes of computing diluted earnings (loss) per common share
567,432

 
594,587

 
570,640

 
606,104

Basic earnings (loss) per common share
$
0.33

 
(1.76
)
 
1.03

 
(0.79
)
Diluted earnings (loss) per common share
$
0.33

 
(1.76
)
 
1.02

 
(0.79
)

Our calculation of diluted earnings (loss) 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 2.1 million and 2.7 million for the three months ended September 30, 2014 and 2013, respectively and 2.5 million for both the nine months ended September 30, 2014 and 2013. For the three and nine months ended September 30, 2013, due to the net loss position, we excluded from the calculation of diluted loss per share 1.16 million and 1.37 million shares, respectively, which were potentially issuable under incentive compensation plans or convertible securities, as their effect, if included, would have been anti-dilutive.