Presented below is a summary of the stock-based compensation cost and associated tax benefit included in the accompanying consolidated statements of operations:


	Three Months Ended June 30,				Six Months Ended June 30,
	2026		2025		2026		2025
Stock-based compensation cost	$	60	$	61	$	117	$	118
Tax benefit	$	13	$	13	$	26	$	25

During the first half of 2026, the Company granted 0.1 million employee stock options, which had a weighted average grant date fair value of $133.17 per share. The Company also granted 0.5 million shares of restricted stock in the first half of 2026, which had a weighted average grant date fair value of $443.74 per share. Both the employee stock options and restricted stock generally vest ratably over four years. Additionally, the Company granted 0.1 million shares of performance-based awards whereby the number of shares that ultimately vest is based on the achievement of certain non-market-based performance metrics of the Company over three years. The weighted average grant date fair value of these awards was $431.10 per share.

The following weighted average assumptions were used in determining the fair value using the Black-Scholes option-pricing model for options granted in 2026:

Unrecognized stock-based compensation expense at June 30, 2026 was $13 million and $354 million for unvested stock options and restricted stock, respectively, which is expected to be recognized over a weighted average period of 1.9 years and 2.6 years, respectively. Additionally, there was $61 million of unrecognized stock-based compensation expense relating to the aforementioned non-market-based performance-based awards, which is expected to be recognized over a weighted average period of 2.0 years.


	Six months ended June 30,
	2026		2025
Exercise of stock options:
Proceeds from stock option exercises	$	12	$	20
Aggregate intrinsic value	$	16	$	31
Tax benefit realized upon exercise	$	4	$	7
Number of shares exercised	0.1		0.1
Vesting of restricted stock:
Fair value of shares vested	$	203	$	236
Tax benefit realized upon vesting	$	49	$	58
Number of shares vested	0.4		0.5
Vesting of performance-based restricted stock:
Fair value of shares vested	$	72	$	8
Tax benefit realized upon vesting	$	12	$	1
Number of shares vested (1)	0.2		—