Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2023

Share-Based Payment Arrangement [Abstract]

Schedule of Number of Common Shares Reserved for Issuance

The number of common shares reserved for issuance under the 2019 Plan are as follows: 

(in millions)	December 31,
	2023	2022
Shares available for granting 1	18.3	19.3
Options outstanding	0.1	0.2
Total shares reserved for issuance	18.4	19.5

1 Shares reserved for issuance under the Director Plan are less than 1.0 million at both December 31, 2023 and 2022.

Schedule of Stock-based Compensation Expense

Stock-based compensation expense and the corresponding tax benefit are as follows: 

(in millions)	Year Ended December 31,
	2023		2022		2021
Stock option expense	$	—	$	—	$	—
Restricted stock and other stock-based awards expense	171		214		122
Total stock-based compensation expense	$	171	$	214	$	122
Tax benefit	$	32	$	38	$	20

Schedule of Stock Option Activity

Stock option activity is as follows: 

(in millions, except per award amounts)	Shares	Weighted average exercise price		Weighted-average remaining years of contractual term	Aggregate intrinsic value
Options outstanding as of December 31, 2022	0.2	$	68.02
Exercised	(0.1)	$	64.92
Options outstanding as of December 31, 2023	0.1	$	77.25	0.79	$	24
Options exercisable as of December 31, 2023	0.1	$	77.25	0.79	$	24

Schedule of Stock Option Exercises

Information regarding our stock option exercises is as follows: 

(in millions)	Year Ended December 31,
	2023		2022		2021
Net cash proceeds from the exercise of stock options	$	13	$	7	$	13
Total intrinsic value of stock option exercises	$	55	$	13	$	41
Income tax benefit realized from stock option exercises	$	12	$	4	$	11

Schedule of Restricted Stock and Unit Activity

Restricted stock and other stock-based award activity is as follows: 

(in millions, except per award amounts)	Shares		Weighted-average grant-date fair value
Balance as of December 31, 2022	1.6		$	364.50
Granted	0.6		$	374.00
Vested	(0.8)		$	388.31
Forfeited	—		$	325.24
Balance as of December 31, 2023	1.4		$	365.51
Total unrecognized compensation expense related to restricted awards	$	159
Weighted-average years to be recognized over	1.2

	Year Ended December 31,
	2023		2022		2021
Weighted-average grant-date fair value per award	$	374.00	$	384.65	$	296.49
Total fair value of restricted stock and other stock-based awards vested	$	323	$	146	$	243
Tax benefit relating to restricted award activity	$	71	$	30	$	48