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Stock Option Plans (Tables)
3 Months Ended
Mar. 31, 2026
Share-Based Payment Arrangement [Abstract]  
Stock Option Granted and Stock Option Compensation Expense
Stock option grants and compensation expense (in millions):
Three-month period ended March 31
20262025
Grant dateMarch 1, 2026March 1, 2025
Stock options granted1.5 0.8 
Stock option compensation expense$20 $18 
Black-Scholes Option Pricing Model with Weighted Average
Fair value of stock options at the date of grant is estimated using the Black-Scholes model with the following weighted average assumptions:
Three-month period ended March 31
20262025
Expected dividend yield1.2%0.8%
Expected risk-free interest rate3.6%4.1%
Volatility22.3%25.4%
Expected life (in years)5.55.5
Stock Option Activity and Related Information
The following is a summary of our stock option activity and related information for 2026 (in millions, except exercise price and year data):
Three-month period ended March 31, 2026
Shares
Under
Option
Weighted
Average
Exercise
Price
Weighted
Average
Remaining
Contractual
Term
(in years)
Aggregate
Intrinsic
Value
Beginning balance6.7$177.48 
Granted1.5228.20 
Exercised(0.5)95.43 
Forfeited or canceled(0.1)187.95 
Ending balance7.6$192.31 4.07$323 
Exercisable at end of period3.1$132.32 2.22$259 
Ending unvested and expected to vest4.1$231.76 5.25$61 
Other Information Regarding Stock Options Outstanding and Exercisable
Options outstanding and exercisable at March 31, 2026 (in millions, except exercise price and year data):
  Options OutstandingOptions Exercisable
Range of Exercise PricesNumber
Outstanding
Weighted
Average
Remaining
Contractual
Term
(in years)
Weighted
Average
Exercise
Price
Number
Exercisable
Weighted
Average
Exercise
Price
$86.17 — $86.17 0.7 0.95$86.17 0.7 $86.17 
127.90 — 127.90 1.1 1.96127.90 1.1 127.90 
156.85 — 156.85 0.7 2.84156.85 0.4 156.85 
158.56 — 161.14 0.9 2.96158.64 0.6 158.57 
177.09 — 202.13 1.0 3.96177.71 0.3 177.09 
228.20 — 228.20 1.5 6.92228.20 — — 
238.88 — 243.54 0.9 4.92243.54 — — 
337.74 — 347.44 0.8 5.92337.75 — — 
$86.17 — $347.44 7.6 4.07$192.31 3.1 $132.32