Stock-based Compensation Expense (Tables)

12 Months Ended

Dec. 31, 2024

Share-Based Payment Arrangement [Abstract]

Schedule of Weighted Average Assumptions used in the Black-Scholes Option Pricing Model

The weighted average assumptions used in the Black-Scholes option pricing model are as follows: 

	2024			2023			2022
Expected stock price volatility	25		%	25		%	26		%
Risk free interest rate	4.3		%	4.2		%	2.0		%
Expected life of options (years)	5.0			4.7			4.7
Expected annual dividend	0.3		%	0.3		%	0.2		%
Weighted average per share grant-date fair values of options granted	$	166.92		$	159.32		$	135.07

Schedule of the Company's Option Activity

A summary of the company’s option activity for the year ended December 31, 2024 is presented below:

	Shares (in millions)	Weighted average exercise price		Weighted average remaining contractual term (in years)	Aggregate intrinsic value (in millions)
Outstanding at December 31, 2023	5.0	$	401.30
Granted	1.0	554.31
Exercised	(1.2)	260.55
Canceled/expired	(0.2)	559.45
Outstanding at December 31, 2024	4.5	$	465.80	4.3	$	358
Vested and unvested expected to vest at December 31, 2024	4.4	$	462.90	4.2	$	358
Exercisable at December 31, 2024	2.6	$	403.06	2.9	$	350

Schedule of the Company's Restricted Unit Activity

A summary of the company’s restricted unit activity for the year ended December 31, 2024 is presented below:

	Units (in millions)	Weighted average grant-date fair value
Unvested at December 31, 2023	0.6	$	533.65
Granted	0.4	556.83
Performance adjustments	(0.1)	558.66
Vested	(0.3)	524.55
Forfeited	(0.1)	539.83
Unvested at December 31, 2024	0.6	$	551.81