Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Condensed Consolidated Balance Sheets
Property, plant and equipment - accumulated depreciation (in dollars)	$ 2,913	$ 2,826
Other intangible assets - accumulated amortization (in dollars)	$ 122	$ 106
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	6,125,618	5,396,526