Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Other intangible assets - accumulated amortization (in dollars)	$ 139	$ 106
Preferred stock, authorized shares	25,000,000	25,000,000
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, issued shares	0	0
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	5,815,904	5,396,526
Common Stock Issued
Common stock, shares issued	77,811,000	77,811,000
Treasury Stock
Common stock, shares issued	5,815,000	5,397,000
Common Stock Shares Outstanding
Common stock, shares issued	71,996,000	72,414,000