Income Taxes - Summary of Deferred Tax Assets and Liabilities are Recorded by Tax Jurisdiction in Accompanying Consolidated Balance Sheets (Detail) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Deferred tax assets		$ 18
Deferred income taxes	$ 47	28
Net deferred tax liabilities	$ (47)	$ (10)