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Earnings (Loss) Per Common Share
 9 Months Ended
Sep. 30, 2019
Earnings Per Share [Abstract]  
Earnings (Loss) Per Common Share Earnings (Loss) Per Common Share

Basic and diluted earnings (loss) per common share were calculated as follows:
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2019
 
2018
 
2019
 
2018
 
(Dollars in millions, except per share amounts, shares in thousands)
Income (Loss) (Numerator):
 
 
 
 
 
 
 
Net income (loss)
$
302

 
272

 
(5,492
)
 
679

Net income (loss) applicable to common stock for computing basic earnings per common share
302

 
272

 
(5,492
)
 
679

Net income (loss) as adjusted for purposes of computing diluted earnings per common share
$
302

 
272

 
(5,492
)
 
679

Shares (Denominator):
 
 
 
 
 
 
 
Weighted-average number of shares:
 
 
 
 
 
 
 
Outstanding during period
1,090,755

 
1,080,589

 
1,088,229

 
1,077,712

Non-vested restricted stock
(18,212
)
 
(13,685
)
 
(17,308
)
 
(12,302
)
Weighted-average shares outstanding for computing basic earnings per common share
1,072,543

 
1,066,904

 
1,070,921

 
1,065,410

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

 
10

 
—

 
10

Shares issuable under incentive compensation plans
2,237

 
5,437

 
—

 
4,306

Number of shares as adjusted for purposes of computing diluted earnings (loss) per common share
1,074,790

 
1,072,351

 
1,070,921

 
1,069,726

Basic earnings (loss) per common share
$
0.28

 
0.25

 
(5.13
)
 
0.64

Diluted earnings (loss) per common share (1)
$
0.28

 
0.25

 
(5.13
)
 
0.63

______________________________________________________________________ 
(1)
For the nine months ended September 30, 2019, we excluded from the calculation of diluted loss per share 2.3 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 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. We also exclude unvested restricted stock awards that are antidilutive as a result of unrecognized compensation cost. Such shares averaged 5.2 million and 8.3 million for the three and nine months ended September 30, 2019, respectively, and 1.5 million and 3.0 million for the three and nine months ended September 30, 2018, respectively.