Derivative Instruments (Income Statement Location) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Foreign Exchange Contract
Derivative Instruments, Gain (Loss) [Line Items]
Net currency exchange rate gains (losses)	$ 3	$ 3	$ 1	$ 1
Foreign Exchange Contract \| Cost of sales
Derivative Instruments, Gain (Loss) [Line Items]
Net currency exchange rate gains (losses)	2	2	4	4
Foreign Exchange Contract \| Other income (expense), net
Derivative Instruments, Gain (Loss) [Line Items]
Net currency exchange rate gains (losses)	(6)	1	(10)	(3)
Net Investment Hedging [Member] \| Other income (expense), net
Derivative Instruments, Gain (Loss) [Line Items]
Net currency exchange rate gains (losses)	$ 7	$ 0	$ 7	$ 0

Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 830
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6450222&loc=d3e30840-110895

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 830
-SubTopic 20
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=109240200&loc=d3e30700-110894

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 830
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=109240200&loc=d3e30690-110894

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