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(Loss) Earnings Per Common Share
 12 Months Ended
Dec. 31, 2018
Earnings Per Share [Abstract]  
(Loss) Earnings Per Common Share
(Loss) Earnings Per Common Share
Basic and diluted (loss) earnings per common share for the years ended December 31, 2018, 2017 and 2016 were calculated as follows:
 
Years Ended December 31,
 
2018
 
2017
 
2016
 
(Dollars in millions, except per share amounts, shares in thousands)
Loss income (Numerator):
 
 
 
 
 
Net (loss) income
$
(1,733
)
 
1,389

 
626

Net (loss) income applicable to common stock for computing basic earnings per common share
(1,733
)
 
1,389

 
626

Net (loss) income as adjusted for purposes of computing diluted earnings per common share
$
(1,733
)
 
1,389

 
626

Shares (Denominator):
 
 
 
 
 
Weighted average number of shares:
 
 
 
 
 
Outstanding during period
1,078,409

 
635,576

 
545,946

Non-vested restricted stock
(12,543
)
 
(7,768
)
 
(6,397
)
Weighted average shares outstanding for computing basic earnings per common share
1,065,866

 
627,808

 
539,549

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

 
10

 
10

Shares issuable under incentive compensation plans
—

 
875

 
1,120

Number of shares as adjusted for purposes of computing diluted (loss) earnings per common share
1,065,866

 
628,693

 
540,679

Basic (loss) earnings per common share
$
(1.63
)
 
2.21

 
1.16

Diluted (loss) earnings per common share (1)
$
(1.63
)
 
2.21

 
1.16


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(1) For the year ended December 31, 2018, we excluded from the calculation of diluted loss per share 4.6 million shares potentially issuable under incentive compensation plans or convertible securities, as their effect, if included, would have been anti-dilutive.
Our calculation of diluted (loss) 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. We also exclude unvested restricted stock awards that are antidilutive as a result of unrecognized compensation cost. Such shares averaged 2.7 million, 4.7 million and 3.3 million for 2018, 2017 and 2016, respectively.