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Earnings (Loss) Per Share
 12 Months Ended
Dec. 31, 2020
Earnings Per Share [Abstract]  
Earnings (Loss) Per Share EARNINGS (LOSS) PER SHARE
The computations of UAL's basic and diluted earnings (loss) per share are set forth below for the years ended December 31 (in millions, except per share amounts):
202020192018
Earnings (loss) available to common stockholders$(7,069)$3,009 $2,122 
Basic weighted-average shares outstanding279.4 258.8 275.5 
Effect of share-based awards— 1.1 1.2 
Diluted weighted-average shares outstanding279.4 259.9 276.7 
Earnings (loss) per share, basic$(25.30)$11.63 $7.70 
Earnings (loss) per share, diluted$(25.30)$11.58 $7.67 
The number of antidilutive securities excluded from the computation of diluted per share amounts was not material.