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Loss Per Share
 3 Months Ended
Mar. 31, 2022
Earnings Per Share [Abstract]  
Loss Per Share Loss Per Share
Basic earnings per share is calculated by dividing net (loss) income by the weighted average number of shares outstanding during the period. Diluted earnings per share is calculated similarly but includes potential dilution from restricted stock units, the Crewmember Stock Purchase Plan, convertible notes, and any other potentially dilutive instruments using the treasury stock and if-converted methods. Anti-dilutive common stock equivalents excluded from the computation of diluted earnings per share amounts were 2.9 million and 3.5 million for the three months ended March 31, 2022 and 2021, respectively.
The following table shows how we computed loss per common share for the three months ended March 31, 2022 and 2021 (dollars and share data in millions):
Three Months Ended March 31,
 20222021
Net loss$(255)$(247)
Weighted average basic shares320.5 316.3 
Effect of dilutive securities— — 
Weighted average diluted shares320.5 316.3 
Loss per common share
Basic$(0.79)$(0.78)
Diluted$(0.79)$(0.78)