Other Income and Expense - Other Expense (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Schedule of other expense [Line Items]
Other Expenses	$ 8	$ 20
Other Expense [Member]
Schedule of other expense [Line Items]
Loss on sale of assets	7	15
Legal settlement	1	3
Other Cost and Expense, Operating	$ 0	$ 2