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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, 2018	Dec. 31, 2017	Dec. 31, 2016
Pension
Change in benefit obligation
Benefit obligation at January 1	$ 136	$ 120
Service cost	8	9	$ 8
Interest cost	3	3	3
Plan participant contributions	1	1
Actuarial (gain) loss	(5)	(3)
Benefits paid	(2)	(4)
Curtailment	(1)	0
Settlement	(4)	0
Currency translation adjustments	(4)	10
Benefit obligation at December 31	132	136	120
Change in plan assets
Fair value of plan assets at January 1	75	64
Actual return on plan assets	(2)	5
Company contributions	5	5
Benefits paid	(2)	(4)
Currency translation adjustments	(1)	4
Plan participant contribution	1	1
Settlements	(4)	0
Other	(4)	0
Fair value of plan assets at December 31	68	75	64
Funded status (underfunded)	(64)	(61)
Amounts Recognized in the Consolidated Balance Sheet
Non-current assets	5	10
Current liabilities	(1)	(2)
Non-current liabilities	(68)	(69)
Net amounts recognized	(64)	(61)
Amounts Recognized in Accumulated Other Comprehensive Income, Pension
Unrecognized Net actuarial loss	16	15
Unrecognized Prior service (credit) cost	0	(1)
Total	16	14
Postemployment
Change in benefit obligation
Benefit obligation at January 1	47	42
Service cost	8	7	6
Interest cost	1	1	1
Plan participant contributions	0	0
Actuarial (gain) loss	12	12
Benefits paid	(14)	(15)
Curtailment	0	0
Settlement	0	0
Currency translation adjustments	0	0
Benefit obligation at December 31	54	47	$ 42
Change in 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
Settlements	0	0
Other	0	0
Fair value of plan assets at December 31	0	0
Funded status (underfunded)	(54)	(47)
Amounts Recognized in the Consolidated Balance Sheet
Non-current assets	0	0
Amounts Recognized in Accumulated Other Comprehensive Income (Loss)
Current liabilities	(9)	(7)
Non-current liabilities	(45)	(40)
Net amounts recognized	(54)	(47)
Amounts Recognized in Accumulated Other Comprehensive Income, Pension
Unrecognized Net actuarial loss	44	37
Unrecognized Prior service (credit) cost	3	3
Total	$ 47	$ 40

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