Stock-Based Compensation - Schedule of Stock-Based Compensation Expense (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense recognized	$ 58	$ 50	$ 43
Unrecognized compensation cost	29
Service and Performance Based Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense recognized	56	49	41
Unrecognized compensation cost	$ 28
Weighted-average period over which unrecognized compensation cost will be recognized	1 year 10 months 24 days
Incentive Compensation Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense recognized	$ 1	1	1
Unrecognized compensation cost	$ 1
Weighted-average period over which unrecognized compensation cost will be recognized	1 year 9 months 18 days
Directors' Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense recognized	$ 1	$ 0	$ 1
Unrecognized compensation cost	$ 0