Summary of Funded Status of Pension Plans (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Compensation and Retirement Disclosure [Abstract]
Defined Benefit Plan, Plans with Benefit Obligations in Excess of Plan Assets, Aggregate Benefit Obligation	$ 720	$ 386
Defined Benefit Plan, Assets for Plan Benefits, Noncurrent	0	(30)
Pension and Other Postretirement Defined Benefit Plans, Current Liabilities	(1)	(1)
Pension and Other Postretirement Defined Benefit Plans, Liabilities, Noncurrent	(196)	(158)
Employee Benefit Plans [Abstract]
Benefit obligation at end of prior year	656	716
Service cost	4	5	$ 5
Interest cost	21	22	29
Actuarial loss	115	(32)
Defined Benefit Plan, Foreign Currency Exchange Rate Gain (Loss)	(53)	(30)
Benefit obligation at end of current year	720	656	716
Fair value of assets at end of prior year	527	553
Actual return on plan assets	60	5
Employer contributions	12	14
Defined Benefit Plan, Foreign Currency Exchange Rate Changes, Plan Assets	(53)	(20)
Net benefits paid	(23)	(25)
Fair value of assets at end of current year	523	527	553
Total unfunded status at end of year (recognized in other non-current liabilities in the Consolidated Balance Sheets)	(197)	(129)
Defined Benefit Plan, Plans with Benefit Obligations in Excess of Plan Assets, Aggregate Fair Value of Plan Assets	523	228
Defined Benefit Plan, Expected Return on Plan Assets	27	31	32
Defined Benefit Plan Amortization Of Unrecognized Amounts	5	5	3
Defined Benefit Plan, Net Periodic Benefit Cost	$ 3	$ 1	$ 5