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Derivative Instruments Schedule of Derivatives (Details) - USD ($) $ in Millions	9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Derivatives, Fair Value [Line Items]
Warrants and Rights Outstanding				$ 70
Warrant Fair Value Adjustment			$ (70)	(86)	$ (16)
Foreign currency forward contracts [Member] \| Not Designated as Hedging Instrument [Member] \| Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross	$ 0			5
Foreign currency forward contracts [Member] \| Not Designated as Hedging Instrument [Member] \| Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative liability, fair value, gross	(4)			(4)
Other Nonoperating Income (Expense) [Member] \| Foreign currency forward contracts [Member] \| Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, Gain (Loss) on Derivative, Net	$ (15)			$ (25)	(25)
Other Nonoperating Income (Expense) [Member] \| Warrant [Member] \| Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, Gain (Loss) on Derivative, Net		$ (86)			$ 16