Derivative Instruments Schedule of Derivatives (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Derivatives, Fair Value [Line Items]
Warrants and Rights Outstanding	$ 70	$ 156
Fair Value Adjustment of Warrants	(86)	(16)	$ 0
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	5	7
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)	(14)
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	(25)	(25)	(115)
Other Nonoperating Income (Expense) [Member] | Warrant [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, Gain (Loss) on Derivative, Net		16	0
Other Nonoperating Income (Expense) [Member] | Currency Swap [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative, Gain (Loss) on Derivative, Net	$ 0	$ 0	$ 13