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Net Earnings Per Share
 9 Months Ended
Sep. 30, 2023
Earnings Per Share [Abstract]  
Net Earnings Per Share
Net earnings per share were computed as follows:
 Three months ended 
 September 30,		Nine months ended 
 September 30,
 2023202220232022
 (in millions, except per share amounts)
Net earnings attributable to common stockholders$164 $438 $1,251 $2,486 
Basic earnings per common share:    
Weighted-average common shares outstanding192.4 200.2 194.4 205.6 
Net earnings attributable to common stockholders$0.85 $2.19 $6.44 $12.09 
Diluted earnings per common share:    
Weighted-average common shares outstanding192.4 200.2 194.4 205.6 
Dilutive common shares—stock-based awards0.5 0.7 0.5 0.9 
Diluted weighted-average common shares outstanding192.9 200.9 194.9 206.5 
Net earnings attributable to common stockholders$0.85 $2.18 $6.42 $12.04 
Diluted earnings per common 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 zero in both the three and nine months ended September 30, 2023 and the three and nine months ended September 30, 2022.