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Stock-Based Compensation (Tables)
3 Months Ended
Mar. 31, 2025
Share-Based Payment Arrangement [Abstract]  
Schedule of Stock Based Compensation Expense
Information regarding stock-based compensation expense appears in the table below:

Millions, for the three months ended March 31,20252024
Stock-based compensation, before tax:
Stock options$6 $
Retention awards22 17 
ESPP6 
Total stock-based compensation, before tax$34 $26 
Excess income tax benefits from equity compensation plans$7 $
Schedule of Annual Weighted Average Assumptions
The table below shows the annual weighted-average assumptions used for Black-Scholes valuation purposes:

Weighted-average assumptions20252024
Risk-free interest rate4.3%4.2%
Dividend yield2.2%2.1%
Expected life (years)4.34.4
Volatility22.4%28.7%
Weighted-average grant-date fair value of options granted$48.70 $61.75 
Schedule of Stock Option Activity
A summary of stock option activity during the three months ended March 31, 2025, is presented below:

Options (thous.)Weighted-average
exercise price
Weighted-average remaining contractual term (in yrs.)Aggregate intrinsic value (millions)
Outstanding at January 1, 20251,981$195.81 5.8$74 
Granted423243.51 N/AN/A
Exercised(223)164.76 N/AN/A
Forfeited or expired-N/AN/A
Outstanding at March 31, 20252,181$208.24 6.3$70 
Vested or expected to vest at March 31, 20252,160$207.96 6.3$70 
Options exercisable at March 31, 20251,462$193.18 4.9$66 
Schedule of Additional Information Regarding Stock Option Exercises Additional information regarding stock option exercises appears in the following table:
Millions, for the three months ended March 31,20252024
Intrinsic value of stock options exercised$20 $12 
Cash received from option exercises41 15 
Treasury shares repurchased for employee payroll taxes(6)(4)
Income tax benefit realized from option exercises2 
Aggregate grant-date fair value of stock options vested16 15 
Schedule of Changes in Retention Awards
Changes in our retention awards during the three months ended March 31, 2025, were as follows:

Shares (thous.)Weighted-average
grant-date fair value
Nonvested at January 1, 2025915$222.50 
Granted228243.51 
Vested(223)204.69 
Forfeited(7)227.18 
Nonvested at March 31, 2025913$232.06 
Schedule of Changes in Performance Stock Unit Awards
Changes in our performance stock unit awards during the three months ended March 31, 2025, were as follows:

Shares (thous.)Weighted-average
grant-date fair value
Nonvested at January 1, 2025607$219.08 
Granted254243.51 
Vested(68)246.21 
Unearned(83)244.35 
Forfeited(67)214.99 
Nonvested at March 31, 2025643$223.03