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Stock-based Compensation (Tables)
 12 Months Ended
Dec. 31, 2024
Share-based Compensation Arrangement by Share-based Payment Award  
Share-based Payment Arrangement, Cost by Plan
The following table summarizes stock-based compensation costs for the years ended December 31, 2024, 2023, and 2022.
.
Year Ended December 31,
Millions of dollars202420232022
Stock-based compensation cost$223 $219 $219 
Tax benefit(38)(36)(33)
Stock-based compensation cost, net of tax$185 $183 $186 
Stock Options  
Share-based Compensation Arrangement by Share-based Payment Award  
Share-based Payment Arrangement, Option, Activity
The following table represents our stock options activity during 2024.
Number
of Shares
(in millions)		Weighted
Average
Exercise
Price
per Share		Weighted
Average
Remaining
Contractual Term (years)		Aggregate
Intrinsic
Value
(in millions)
Outstanding at January 1, 202414.3$45.47 
Exercised(0.3)26.89 
Forfeited/expired(3.6)58.04 
Outstanding at December 31, 202410.4$41.75 2.4$4.0 
Exercisable at December 31, 202410.4$41.75 2.4$4.0 
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions
Restricted Stock  
Share-based Compensation Arrangement by Share-based Payment Award  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions
The following table represents our restricted stock awards and restricted stock units granted, vested, and forfeited during 2024.
.
Number of Shares
(in millions)		Weighted Average
Grant-Date Fair
Value per Share
Nonvested shares at January 1, 202420.9$27.42 
Granted7.336.76 
Vested(7.7)25.10 
Forfeited(1.0)29.30 
Nonvested shares at December 31, 202419.5$31.64 
Employee Stock Purchase Plan  
Share-based Compensation Arrangement by Share-based Payment Award  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions The assumptions and resulting fair values were as follows:
Year Ended December 31,
202420232022
Expected volatility30 %48 %46 %
Expected dividend yield2.00 %1.44 %1.67 %
Risk-free interest rate5.24 %5.11 %1.42 %
Weighted average grant-date fair value per share$5.60 $7.16 $5.63