Other Expense, Net (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Investment [Line Items]
Interest Income	$ 137	$ 81	$ 48
Interest Expense	(667)	(592)	(469)
Other Items, Net	9	(20)	(13)
Other Expense, Net	(521)	(531)	(434)
Fees Associated with Short-term Financing Commitments		32	22
Losses on Extinguishment of Debt		4	9
Gain (Loss) on Sale of Investments	$ (15)	$ 17	13
Joint Venture [Member]
Investment [Line Items]
Gain (Loss) on Sale of Investments			8
Proceeds from Divestiture of Interest in Joint Venture			$ 65