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Earnings (Loss) Per Common Share
 3 Months Ended
Mar. 31, 2020
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 March 31,
 
2020
 
2019
 
(Dollars in millions, except per share amounts, shares in thousands)
Income (Loss) (Numerator):
 
 
 
Net income (loss)
$
314

 
(6,165
)
Net income (loss) applicable to common stock for computing basic earnings per common share
314

 
(6,165
)
Net income (loss) as adjusted for purposes of computing diluted earnings per common share
$
314

 
(6,165
)
Shares (Denominator):
 
 
 
Weighted-average number of shares:
 
 
 
Outstanding during period
1,092,970

 
1,083,588

Non-vested restricted stock
(17,511
)
 
(14,710
)
Weighted-average shares outstanding for computing basic earnings per common share
1,075,459

 
1,068,878

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

 
—

Shares issuable under incentive compensation plans
6,285

 
—

Number of shares as adjusted for purposes of computing diluted earnings (loss) per common share
1,081,754

 
1,068,878

Basic earnings (loss) per common share
$
0.29

 
(5.77
)
Diluted earnings (loss) per common share (1)
$
0.29

 
(5.77
)
______________________________________________________________________ 
(1)
For the three months ended March 31, 2019, we excluded from the calculation of diluted loss per share 3.3 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 2.7 million and 5.4 million for the three months ended March 31, 2020 and 2019, respectively.