Commitments and Contingencies (Narrative) (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Loss Contingencies [Line Items]
Personal injury or wrongful death charges		$ 5		$ 11
Insurance receivable	$ 19		$ 19		$ 10
Reserves related to personal injury or wrongful death cases	2		2		$ 7
Maximum [Member]
Loss Contingencies [Line Items]
Personal injury or wrongful death charges	$ 1		$ 1