Income Taxes - Reconciliation of Deferred Taxes to Deferred Taxes Shown In Balance Sheet (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Reducing in Tax Loss Carryforward Due To Realization Foreign Tax Loss	$ 7	$ 13
Balance Sheet:
Non-current portion - deferred tax asset	199	221
Non-current portion - deferred tax liability	(7)	(7)
Net deferred tax assets	192	214
Deferred Tax Assets, Valuation Allowance	145	127
Income tax expense	0	$ 146	$ 131
Impact on earnings related to reversal of valuation allowance	$ 110