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Earnings (Loss) Per Common Share (Tables)
 12 Months Ended
Dec. 31, 2014
Earnings Per Share [Abstract]  
Schedule of basic and diluted earnings per common share
Basic and diluted earnings (loss) per common share for the years ended December 31, 2014, 2013 and 2012 were calculated as follows:
 
Years Ended December 31,
 
2014
 
2013
 
2012
 
(Dollars in millions, except per share amounts, shares in thousands)
Income (Loss) (Numerator):
 
 
 
 
 
Net income (loss)
$
772

 
(239
)
 
777

Earnings applicable to non-vested restricted stock
—

 
—

 
(1
)
Net income (loss) applicable to common stock for computing basic earnings (loss) per common share
772

 
(239
)
 
776

Net income (loss) as adjusted for purposes of computing diluted earnings (loss) per common share
$
772

 
(239
)
 
776

Shares (Denominator):
 
 
 
 
 
Weighted average number of shares:
 
 
 
 
 
Outstanding during period
572,748

 
604,404

 
622,139

Non-vested restricted stock
(4,313
)
 
(3,512
)
 
(2,796
)
Non-vested restricted stock units
—

 
—

 
862

Weighted average shares outstanding for computing basic earnings (loss) per common share
568,435

 
600,892

 
620,205

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

 
—

 
12

Shares issuable under incentive compensation plans
1,294

 
—

 
2,068

Number of shares as adjusted for purposes of computing diluted earnings (loss) per common share
569,739

 
600,892

 
622,285

Basic earnings (loss) per common share
$
1.36

 
(0.40
)
 
1.25

Diluted earnings (loss) per common share
$
1.36

 
(0.40
)
 
1.25


Our calculation of diluted