Derivatives and Hedging Activities - Summarization for Foreign Currency Forward Purchase and Sale Contracts (Details) - Foreign Exchange Forward $ in Millions	Mar. 31, 2019 USD ($)
Long
Notional amount	$ (33)
Short
Notional amount	$ (33)

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