Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Reserves on receivables	$ 8	$ 8
Accumulated depreciation	$ 2,026	$ 1,960
Preferred stock - par value	$ 1	$ 1
Preferred stock - authorized shares	36,000,000	36,000,000
Preferred stock - outstanding shares	0	0
Common stock - par value	$ 0.1	$ 0.1
Common stock - authorized shares	200,000,000	200,000,000
Common stock - issued shares	143,410,000	146,167,000
Treasury Stock, Shares	3,103,000	0