Property, Plant and Equipment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 546	$ 641
Less accumulated depreciation	(297)	(377)
Property, plant and equipment, net	249	264
Depreciation	78	79	$ 75
Buildings
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	57	54
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	7	8
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	204	233
Furniture and office equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	18	19
Software and computer equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	161	235
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	75	69
Projects in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 24	$ 23