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Stock Compensation Plans (Tables)
 3 Months Ended
Mar. 31, 2024
Share-Based Payment Arrangement [Abstract]  
Schedule of Stock-based Compensation Expense Stock-based compensation expense for the following periods were:
In millionsThree months ended March 31
20242023
Restricted stock units$12 $21 
Stock options—2 
Employee stock purchase plan12 
Stock-based compensation expense1325
Tax benefit(1)— 
Stock-based compensation expense (net of tax)$12 $25 
Schedule of Valuation Assumptions Used To Estimate Fair Value of Stock Options
The table below details the significant assumptions used in determining the fair value of the market-based restricted stock units granted on March 15, 2024:
Dividend yield— %
Risk-free interest rate4.44 %
Expected volatility60.37 %