Financial Instruments - Summarization for Foreign Currency Forward Purchase and Sale Contracts (Details) - Foreign Exchange Forward Contracts $ in Millions	Sep. 30, 2018 USD ($)
Canada, Dollars \| Short
Derivative [Line Items]
Notional Amount in Foreign Currency	$ 2
China, Yuan Renminbi \| Long
Derivative [Line Items]
Notional Amount in Foreign Currency	4
U.S., Dollars \| Long
Derivative [Line Items]
Notional Amount in Foreign Currency	$ 1

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

Name:	invest_DerivativeNotionalAmount
Namespace Prefix:	invest_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant