Segments - Geographic Information (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Geographic Areas, Revenues from External Customers [Abstract]
Net sales	$ 819	$ 851	$ 880	$ 786	$ 831	$ 795	$ 811	$ 767	$ 3,336	$ 3,204	$ 3,017
Geographic Areas, Long-Lived Assets [Abstract]
Long-lived assets	1,838				1,762				1,838	1,762	1,707
Reportable geographical components | United States
Geographic Areas, Revenues from External Customers [Abstract]
Net sales									2,871	2,787	2,625
Geographic Areas, Long-Lived Assets [Abstract]
Long-lived assets	1,680				1,604				1,680	1,604	1,563
Reportable geographical components | Canada
Geographic Areas, Revenues from External Customers [Abstract]
Net sales									448	406	389
Geographic Areas, Long-Lived Assets [Abstract]
Long-lived assets	84				90				84	90	80
Reportable geographical components | Other Foreign
Geographic Areas, Revenues from External Customers [Abstract]
Net sales									211	204	189
Geographic Areas, Long-Lived Assets [Abstract]
Long-lived assets	$ 74				$ 68				74	68	64
Geographic transfers
Geographic Areas, Revenues from External Customers [Abstract]
Net sales									$ (194)	$ (193)	$ (186)