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Equity Incentive Plan (Tables)
 12 Months Ended
Dec. 31, 2022
Share-Based Payment Arrangement [Abstract]  
Table of Performance Share Unit Monte Carlo Assumptions [Table Text Block]
202220212020
Risk-free interest rate4.58 %0.61 %0.18 %
Expected life in years333
Expected volatility26 %25 %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, 2021405,784 $512.30 $480.8 
Granted17,487 1,228.39 
Exercised(114,641)289.73 
Forfeited(481)1,027.67 
Outstanding at December 31, 2022308,149 635.00 250.5 
Options exercisable at December 31, 2022239,129 $503.99 $225.3 
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
140,457 $336.92 3.03140,457 
106,807 $664.31 5.9584,718 
60,885 $1,271.24 8.7713,954 
308,149  5.51239,129 
Schedule of Stock Options, Valuation Assumptions
202220212020
Risk-free interest rate4.35 %0.95 %0.34 %
Expected life in years6.46.36.0
Expected volatility26 %25 %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, 202126,899 $45.614,844 $25.2
Granted8,862  2,350 
Adjustment for performance results achieved(1)
— 4,455 
Vested(9,551) (9,367)
Forfeited(1,318) — 
Outstanding at December 31, 202224,892 $36.012,282 $17.8