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Equity Incentive Plan (Tables)
12 Months Ended
Dec. 31, 2024
Share-Based Payment Arrangement [Abstract]  
Table of Performance Share Unit Monte Carlo Assumptions [Table Text Block]
202420232022
Risk-free interest rate4.24 %4.71 %4.58 %
Expected life in years333
Expected volatility28 %27 %26 %
Expected dividend yield— — — 
Schedule of Stock Options, Activity
Number of
Options
Weighted Average
Exercise Price
Aggregate Intrinsic
Value (in millions)
Outstanding at December 31, 2023259,958 $743.30 $127.2 
Granted17,170 1,260.97 
Exercised(59,443)382.69 
Forfeited(372)1,225.87 
Expired(36)1,484.40 
Outstanding at December 31, 2024217,277 $881.92 $79.6 
Options exercisable at December 31, 2024156,503 $765.33 $74.7 
Schedule Shares Outstanding under Stock Option Plans, by Exercise Price Range
Number of Options
Outstanding
Weighted Average
Exercise Price
Remaining Contractual
Life of Options
Outstanding
Options
Exercisable
85,762 $556.79 2.8585,762 
53,015 $903.76 5.3447,021 
78,500 $1,222.38 8.4123,720 
217,277  5.46156,503 
Schedule of Stock Options, Valuation Assumptions
202420232022
Risk-free interest rate4.31 %4.64 %4.35 %
Expected life in years6.86.76.4
Expected volatility28 %27 %26 %
Expected dividend yield— — — 
Schedule Restricted Stock Units, Activity
Number of Restricted
Stock Units
Aggregate Intrinsic Value (in millions)Number of Performance Share UnitsAggregate Intrinsic Value (in millions)
Outstanding at December 31, 202326,739 $32.410,411 $12.6
Granted9,649  3,149 
Adjustment for performance results achieved(1)
— (3,047)
Vested(8,889) (98)
Forfeited(2,071) — 
Outstanding at December 31, 202425,428 $31.110,415 $12.7