Subsequent Events (Details) - Share Repurchase Plan, February 2018 - Subsequent Event $ in Millions	1 Months Ended
Feb. 28, 2018 USD ($)
Subsequent Event [Line Items]
Increase in authorized repurchase amount	$ 39
Stock repurchase program, authorized amount	$ 100

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

No definition available.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration