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Net Income (Loss) Per Common Share
 9 Months Ended
Sep. 30, 2024
Earnings Per Share [Abstract]  
Net Income (Loss) Per Common Share Net Income (Loss) Per Common Share
Basic earnings per share are computed based on the weighted average number of common shares outstanding. Diluted earnings per share are computed based on the weighted average number of common and dilutive potential common shares outstanding using the treasury stock method. The table shows calculations for basic and diluted earnings per share:
(In millions, except per share data)Three months ended September 30,Nine months ended September 30,
2024202320242023
Numerator:    
Net income (loss)—basic and diluted
$820 $(99)$1,887 $660 
Denominator:    
Basic weighted-average common shares
  outstanding		156.2 156.9 156.5 157.0 
Effect of share-based awards:    
Stock options0.9 — 0.7 0.7 
Nonvested shares0.6 — 0.5 0.5 
Diluted weighted-average shares 157.7 156.9 157.7 158.2 
Earnings (loss) per share:    
Basic$5.25 $(0.63)$12.06 $4.20 
Diluted$5.20 $(0.63)$11.97 $4.17 
Number of anti-dilutive share-based awards0.6 2.4 1.3 1.3 

The source of dilution of our common shares are certain equity-based awards. See our 2023 Annual Report on Form 10-K, Item 8, Note 17, Share-Based Associate Compensation Plans, Page 177, for information about share-based awards. The above table shows the number of anti-dilutive share-based awards for the three and nine months ended September 30, 2024 and 2023. In accordance with Accounting Standards Codification 260, Earnings per Share, the assumed exercise of share-based awards was excluded from the computation of diluted loss per share for the three months ended September 30, 2023 because their exercise would have anti-dilutive effects.