Summarized Financial Information of Unconsolidated Affiliate Summarized Operations of Unconsolidated Affiliates (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Variable Interest Entity [Line Items]
Net Income of Unconsolidated Affiliates		$ 4
Unconsolidated JV [Member]
Variable Interest Entity [Line Items]
Net Sales of Unconsolidated Affiliates	$ 78	71	$ 93
Gross Profit of Unconsolidated Affiliates	16	15	13
Pre-tax Income of Unconsolidated Affiliates	3	$ 6	0
Net Income of Unconsolidated Affiliates	$ 2		$ (1)