Components of Total Accumulated Other Comprehensive Income in Balance Sheets (Detail) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Equity [Abstract]
Gain on foreign currency forward contracts	$ 4	$ 26
Loss on interest rate swap cash flow hedges	(4)	(5)
Foreign currency translation	(60)	(83)
Other comprehensive loss attributable to non-controlling interests	1	2
Total accumulated other comprehensive loss	$ (59)	$ (60)

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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