Other Income (Expense), Net (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Other Income and Expenses [Abstract]
Equity income from investments in Trinidad	$ 9	$ 8	$ 11
Adjustment to deferred compensation expense	6
Interest income	3		6
Net Foreign Currency Transaction Gains (Losses)	$ (17)	(34)	12
Losses on sales of warehouse stock		$ 15	$ 23