Subsequent Events (Details) $ in Millions	Sep. 30, 2015 USD ($)
Subsequent Events [Abstract]
Accrued post-retirement medical liability	$ 6

The total amount of the entity's obligation as of the balance sheet date under any other retirement plan(s), such as one or more defined contribution plans.

No definition available.

Name:	us-gaap_OtherPostretirementBenefitsPayableCurrentAndNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant