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Stock-based Compensation (Tables)
 12 Months Ended
Dec. 31, 2025
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, 2025, 2024, and
2023.
Year Ended December 31,
Millions of dollars
2025
2024
2023
Stock-based compensation cost
$213
$223
$219
Tax benefit
(36)
(38)
(36)
Stock-based compensation cost, net of tax
$177
$185
$183
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 2025.
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, 2025
10.4
$41.75
Exercised
—
24.73
Forfeited/expired
(2.4)
43.71
Outstanding at December 31, 2025
8.0
$41.23
1.9
$5.8
Exercisable at December 31, 2025
8.0
$41.23
1.9
$5.8
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 2025.
.
Number of
Shares
(in millions)
Weighted
Average
Grant-Date Fair
Value per Share
Nonvested shares at January 1, 2025
19.5
$31.64
Granted
7.8
22.95
Vested
(6.9)
29.18
Forfeited
(1.7)
30.84
Nonvested shares at December 31, 2025
18.7
$29.01
Employee Stock Purchase Plan  
Share-based Compensation Arrangement by Share-based Payment Award  
Schedule of Share-Based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions The assumptions and resulting fair values were as follows:
Year Ended December 31,
2025
2024
2023
Expected volatility
35%
30%
48%
Expected dividend yield
2.78%
2.00%
1.44%
Risk-free interest rate
4.28%
5.24%
5.11%
Weighted average grant-date fair value per share
$4.17
$5.60
$7.16