Changes in Accumulated Other Comprehensive Income Level 4 (Details) - Summary of Changes in Accumulated Other Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Changes in Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	$ (24)	$ (15)	$ (39)	$ (15)
Beginning Balance Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, After Tax	3	3	3	4
Beginning Balance Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax	(27)	(18)	(42)	(19)
Other comprehensive income before reclassifications, net of tax	10	7	25	7
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax	0	0	0	(1)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	10	7	25	8
Ending Balance Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, After Tax	3	3	3	3
Ending Balance Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax	(17)	(11)	(17)	(11)
Ending Balance	$ (14)	$ (8)	$ (14)	$ (8)