Fair Value Measurements (Narrative) (Detail) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Fair Value Disclosures [Abstract]
Net Assets Measured At Fair Value On A Recurring Basis	$ 2,800	$ 2,700
Net Assets Measured At Fair Value On A Recurring Basis Measured Using Unobservable Input And Classified As Level3	$ 2	$ 45