Segments (Details 1) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Geographic Areas, Revenues from External Customers [Abstract]
Net sales	$ 954	$ 972	$ 948	$ 850	$ 915	$ 925	$ 916	$ 814	$ 3,724	$ 3,570	$ 3,224
Geographic Areas, Long-Lived Assets [Abstract]
Long-lived assets	1,908				2,103				1,908	2,103
Reportable Geographical Components | United States
Geographic Areas, Revenues from External Customers [Abstract]
Net sales									3,220	3,029	2,702
Geographic Areas, Long-Lived Assets [Abstract]
Long-lived assets	1,665				1,691				1,665	1,691
Reportable Geographical Components | Canada
Geographic Areas, Revenues from External Customers [Abstract]
Net sales									406	417	408
Geographic Areas, Long-Lived Assets [Abstract]
Long-lived assets	112				128				112	128
Reportable Geographical Components | Other Foreign
Geographic Areas, Revenues from External Customers [Abstract]
Net sales									283	309	288
Geographic Areas, Long-Lived Assets [Abstract]
Long-lived assets	131				284				131	284
Geographic transfers
Geographic Areas, Revenues from External Customers [Abstract]
Net sales									$ (185)	$ (185)	$ (174)