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Earnings Per Share
 12 Months Ended
Dec. 31, 2019
Earnings Per Share [Abstract]  
Earnings Per Share EARNINGS PER SHARE
The computations of UAL's basic and diluted earnings per share are set forth below for the years ended December 31 (in millions, except per share amounts):
 
 
2019
 
2018 (a)
 
2017 (a)
Earnings available to common stockholders
 
$
3,009

 
$
2,122

 
$
2,143

 
 
 
 
 
 
 
Basic weighted-average shares outstanding
 
258.8

 
275.5

 
302.7

Effect of employee stock awards
 
1.1

 
1.2

 
0.9

Diluted weighted-average shares outstanding
 
259.9

 
276.7

 
303.6

 
 
 
 
 
 
 
Earnings per share, basic
 
$
11.63

 
$
7.70

 
$
7.08

Earnings per share, diluted
 
$
11.58

 
$
7.67

 
$
7.06

(a) Amounts adjusted due to the adoption of Accounting Standards Update No. 2016-02, Leases (Topic 842). See Note 1 of this report for additional information on the adjustments.
The number of antidilutive securities excluded from the computation of diluted earnings per share amounts was not material.