Employee Benefit Plans Changes in Benefit Obligations Plan Assets Funded Status and Reconciliation of Funded Status to Amounts Recognized in Consolidated Balance Sheets and in Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Pension Plan
Change in Pension Benefit Obligation
Benefit obligation at January 1	$ 120	$ 115
Service cost	9	8	$ 8
Interest cost	3	3	3
Plan participant contributions	1	1
Actuarial (gain) loss	(3)	5
Benefits paid	(4)	(8)
Currency translation adjustments	10	(2)
Divestiture	0	(2)
Benefit obligation at December 31	136	120	115
Change in Pension Benefit Plan Assets
Fair value of plan assets at January 1	64	63
Actual return on plan assets	5	2
Company contributions	5	6
Benefits paid	(4)	(8)
Currency translation adjustments	4	0
Plan participant contribution	1	1
Fair value of plan assets at December 31	75	64	63
Funded status (underfunded)	(61)	(56)
Amounts Recognized in Balance Sheet, Pension
Non-current assets	10	5
Current liabilities	(2)	(1)
Non-current liabilities	(69)	(60)
Net amounts recognized	(61)	(56)
Amounts Recognized in Accumulated Other Comprehensive Income, Pension
Unrecognized Net actuarial loss	15	21
Unrecognized Prior service (credit) cost	(1)	(1)
Total	14	20
Postemployment Retirement Benefits
Change in Pension Benefit Obligation
Benefit obligation at January 1	42	49
Service cost	7	6	6
Interest cost	1	1	1
Plan participant contributions	0	0
Actuarial (gain) loss	12	12
Benefits paid	(15)	(20)
Currency translation adjustments	0	(1)
Divestiture	0	(5)
Benefit obligation at December 31	47	42	$ 49
Change in Pension Benefit Plan Assets
Fair value of plan assets at January 1	0
Actual return on plan assets	0	0
Company contributions	0	0
Benefits paid	0	0
Currency translation adjustments	0	0
Plan participant contribution	0	0
Fair value of plan assets at December 31	0	0
Funded status (underfunded)	(47)	(42)
Amounts Recognized in the Balance Sheet, Postemployment
Current liabilities	(7)	(6)
Non-current liabilities	(40)	(36)
Non-current liabilities	(47)	(42)
Amounts Recognized in Accumulated Other Comprehensive Income, Pension
Unrecognized Net actuarial loss	37	26
Unrecognized Prior service (credit) cost	3	4
Total	$ 40	$ 30

Employee Benefit Plans Changes in Benefit Obligations Plan Assets Funded Status and Reconciliation of Funded Status to Amounts Recognized in Consolidated Balance Sheets and in Accumulated Other Comprehensive Income (Detail) - USD ($)
$ in Millions