Other Income and Expense - Other Expense (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Schedule of other expense [Line Items]
Gain (Loss) on Disposition of Assets	$ (12)	$ 0
Other Expenses	29	8
Other Expense [Member]
Schedule of other expense [Line Items]
Gain (Loss) on Disposition of Assets	(29)	(5)
Other Nonoperating Expense	0	3
Other Expenses	$ 29	$ 8