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Stock Compensation Plans - Stock-Based Compensation Expense and Related Tax Benefits (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	$ 20	$ 17	$ 32	$ 26
Less: Tax benefit	(4)	(3)	(6)	(5)
Total stock-based compensation expense, after tax	16	14	26	21
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	105		105
Equity-based awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	20	16	32	25
Liability-based awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	$ 0	$ 1	$ 0	$ 1

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