Derivatives - Not Designated (Details) - Derivatives not designated as hedging instruments - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Derivatives not designated as hedging instruments
Gain (Loss) on Derivative Recognized in Income	$ (96)	$ (130)	$ (5)
Foreign currency forward/option contracts \| Cost of sales
Derivatives not designated as hedging instruments
Gain (Loss) on Derivative Recognized in Income	13	11	(14)
Foreign currency forward contracts \| Interest expense.
Derivatives not designated as hedging instruments
Gain (Loss) on Derivative Recognized in Income	$ (109)	$ (141)	$ 9

Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4CC
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL109998890-113959

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959

Name:	us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration