Property, Plant and Equipment (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
	May 21, 2019	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Jan. 01, 2019	Dec. 31, 2018
Property, Plant, and Equipment
Total property, plant and equipment, gross		$ 4,135		$ 4,135			$ 4,067
Less: Accumulated depreciation		1,779		1,779			1,637
Total property, plant and equipment, net		2,356		2,356		$ 2,456	2,430
Gain on disposal of property, plant and equipment		(3)	$ (1)	5	$ (5)
Assets Sold in Purchase and Sale Agreement
Property, Plant, and Equipment
Cash consideration received	$ 43
Gain on disposal of property, plant and equipment	$ 9
Machinery and equipment
Property, Plant, and Equipment
Total property, plant and equipment, gross		3,830		3,830			3,785
Buildings and improvements
Property, Plant, and Equipment
Total property, plant and equipment, gross		87		87			87
Land and improvements
Property, Plant, and Equipment
Total property, plant and equipment, gross		46		46			43
Furniture and fixtures
Property, Plant, and Equipment
Total property, plant and equipment, gross		33		33			33
ROU finance lease
Property, Plant, and Equipment
Total property, plant and equipment, gross		27		27			0
Other
Property, Plant, and Equipment
Total property, plant and equipment, gross		98		98			102
Other
Property, Plant, and Equipment
Total property, plant and equipment, gross		$ 14		$ 14			$ 17