Stock Compensation Plans - Stock-Based Compensation Expense and Related Tax Benefits (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	$ 21	$ 17	$ 73	$ 62
Less: Tax benefit	(4)	(3)	(14)	(12)
Total stock-based compensation expense, after tax	17	14	59	50
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	86		86
Equity-based awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	21	16	72	59
Liability-based awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	$ 0	$ 1	$ 1	$ 3