Significant Accounting Policies (Reconciliation of Total Cash, Restricted Cash and Equivalents) (Parenthetical) (Detail) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash Cash Equivalents And Restricted Cash [Line Items]
Cash and cash equivalents	$ 184	$ 119
Restricted cash and equivalents	$ 4	$ 2	$ 3	$ 3
Restricted Cash and Cash Equivalents, Current, Statement of Financial Position [Extensible Enumeration]	Disposal Group, Including Discontinued Operation, Assets, Current	Disposal Group, Including Discontinued Operation, Assets, Current	Disposal Group, Including Discontinued Operation, Assets, Current	Disposal Group, Including Discontinued Operation, Assets, Current
Current Assets Held for Sale
Cash Cash Equivalents And Restricted Cash [Line Items]
Cash and cash equivalents	$ 33	$ 34	$ 49	$ 21