Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Condensed Consolidated Balance Sheets
Property, plant and equipment, Accumulated depreciation	$ 3,030	$ 2,991
Other intangible assets - accumulated amortization (in dollars)	$ 147	$ 139
Preferred stock, authorized shares	25,000,000	25,000,000
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, authorized shares	200,000,000	200,000,000
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares issued	77,810,875	77,810,875
Treasury stock, shares	5,570,474	5,815,904