Stockholder's Equity - Components of Accumulated Other Comprehensive Income (Loss) included in Stockholders' Equity (Detail) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Stockholders Equity Note [Abstract]
Foreign currency translation adjustments ("CTA")	$ (73)	$ (49)
Net unrealized loss on derivative financial instruments	(40)	(2)
Defined benefit pension and other postretirement plans	6
Accumulated other comprehensive loss	$ (107)	$ (51)

Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses.

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