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.

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

Subsequent Events (Details) - USD ($) $ in Millions	Oct. 31, 2017	Feb. 28, 2017
2017 Capital Return Plan
Subsequent Event
Amount approved under share repurchase program		$ 150
ASR Plan \| Subsequent events
Subsequent Event
Amount approved under share repurchase program	$ 80