Income Taxes - Reconciliation of Deferred Taxes to Deferred Taxes Shown In Balance Sheet (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Reducing in Tax Loss Carryforward Due To Realization Foreign Tax Loss	$ 13	$ 12
Deferred Tax Assets, Valuation Allowance	127	139
Income tax expense	149	131	$ 122
Impact on earnings related to reversal of valuation allowance	15
Balance Sheet:
Current portion - deferred tax asset	0	81
Non-current portion - deferred tax asset	218	143
Current portion - deferred tax liability shown in other current liabilities	0	(4)
Non-current portion - deferred tax liability	(7)	(18)
Net deferred tax assets	$ 211	$ 202