Summary of Funded Status of Pension Plans (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Retirement Benefits [Abstract]
Defined Benefit Plan, Accumulated Benefit Obligation	$ 713	$ 769
Assets for Plan Benefits, Defined Benefit Plan	(18)	(24)
Liability, Defined Benefit Plan, Current	(4)	(3)
Liability, Defined Benefit Plan, Noncurrent	(187)	(186)
Employee Benefit Plans [Abstract]
Benefit obligation at end of prior year	779	720
Service cost	6	5	$ 4
Interest cost	19	19	21
Actuarial loss	(32)	15
Defined Benefit Plan, Benefit Obligation, Foreign Currency Translation Gain (Loss)	(24)	44
Benefit obligation at end of current year	722	779	720
Fair value of assets at end of prior year	614	523
Actual return on plan assets	(29)	59
Employer contributions	11	24
Defined Benefit Plan, Plan Assets, Foreign Currency Translation Gain (Loss)	(21)	32
Net benefits paid	(26)	(24)
Fair value of assets at end of current year	549	614	523
Total unfunded status at end of year (recognized in other non-current liabilities in the Consolidated Balance Sheets)	(173)	(165)
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	33	30	27
Defined Benefit Plan Amortization Of Unrecognized Amounts	7	8	5
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	(1)	2	$ 3
Defined Benefit Plan, Benefit Obligation, Benefits Paid	26	24
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Plan Assets	234	264
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Accumulated Benefit Obligation	$ 423	$ 453