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Net Earnings Per Share
 12 Months Ended
Dec. 31, 2021
Earnings Per Share [Abstract]  
Net Earnings Per Share Net Earnings Per Share
Net earnings per share were computed as follows:
 Year ended December 31,
 202120202019
 (in millions, except per share amounts)
Net earnings attributable to common stockholders$917 $317 $493 
Basic earnings per common share:
Weighted-average common shares outstanding215.0 214.9 220.2 
Net earnings attributable to common stockholders$4.27 $1.48 $2.24 
Diluted earnings per common share:
Weighted-average common shares outstanding215.0 214.9 220.2 
Dilutive common shares—stock-based awards1.2 0.3 1.4 
Diluted weighted-average shares outstanding216.2 215.2 221.6 
Net earnings attributable to common stockholders$4.24 $1.47 $2.23 
Dilutive earnings per share is calculated using weighted-average common shares outstanding, including the dilutive effect of stock-based awards as determined under the treasury stock method. In the computation of diluted earnings per common share, potentially dilutive stock-based awards are excluded if the effect of their inclusion is anti-dilutive. Shares for anti-dilutive stock-based awards not included in the computation of diluted earnings per common share were 0.9 million, 3.3 million and 1.4 million for the years ended December 31, 2021, 2020 and 2019, respectively.