Assets Held for Sale or Sold (Details) - Whitegate Refinery - Refining $ in Millions	Sep. 30, 2016 USD ($)
Assets Held For Sale Or Sold (Textual) [Abstract]
Net carrying value at time of disposition	$ 135
Disposal group inventory, other working capital, and properties, plants and equipment	127
Allocated goodwill included in carrying value of disposed asset	$ 8

Amount classified as assets attributable to disposal group held for sale or disposed of, expected to be disposed of within one year or the normal operating cycle, if longer.

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Name:	us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant