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Earnings (Loss) Per Share (Tables)
 12 Months Ended
Dec. 31, 2021
Earnings Per Share [Abstract]  
Computation of Earnings 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):
202120202019
Earnings (loss) available to common stockholders$(1,964)$(7,069)$3,009 
Basic weighted-average shares outstanding321.9 279.4 258.8 
Dilutive effect of employee stock awards— — 1.1 
Diluted weighted-average shares outstanding321.9 279.4 259.9 
Earnings (loss) per share, basic$(6.10)$(25.30)$11.63 
Earnings (loss) per share, diluted$(6.10)$(25.30)$11.58 
Potentially dilutive securities (a)
Stock warrants0.9 — — 
Employee stock awards0.7 1.0 0.1 
(a) Weighted-average potentially dilutive securities outstanding excluded from the computation of diluted earnings per share because the securities would have had an antidilutive effect.