Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Millions		3 Months Ended
Jan. 01, 2018	Mar. 31, 2018
Schedule Of Accounting Policies [Line Items]
Recorded a net increase in opening retained earnings		$ 4
ASC 606
Schedule Of Accounting Policies [Line Items]
Recorded a net increase in opening retained earnings	$ 4

Amount of the cumulative effect on retained earnings net of related income tax effect.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=64853466&loc=d3e22663-107794

Name:	us-gaap_CumulativeEffectOnRetainedEarningsNetOfTax1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration