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Assets Held for Sale or Sold (Narrative) (Details) - USD ($) $ in Millions	1 Months Ended				12 Months Ended
	Sep. 30, 2016	Dec. 31, 2014	Jul. 31, 2014	Feb. 28, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Feb. 28, 2015
Assets Held For Sale Or Sold (Textual) [Abstract]
Repurchase of common stock, shares (in shares)							17,422,615
Cash included in carrying value reflected as financing cash outflow					$ 0	$ 0	$ 450
Refining | Bantry Bay Terminal
Assets Held For Sale Or Sold (Textual) [Abstract]
Before-tax loss on net PP&E held for sale							12
Refining | IRELAND | Bantry Bay Terminal
Assets Held For Sale Or Sold (Textual) [Abstract]
Before-tax loss on net PP&E held for sale			$ 12
Net carrying value at time of disposition								$ 68
Marketing and Specialties | Phillips Specialty Products Inc
Assets Held For Sale Or Sold (Textual) [Abstract]
Allocated goodwill included in carrying value of disposed asset				$ 117
Net carrying value at time of disposition				$ 685
Repurchase of common stock, shares (in shares)				17,400,000
Recognition of before-tax gain				$ 696
Cash and cash equivalents included in carrying value				481
Net PP&E included in carrying value				$ 60
Marketing and Specialties | Immingham Combined Heat and Power Plant
Assets Held For Sale Or Sold (Textual) [Abstract]
Gain on disposition						$ 242	126
Marketing and Specialties | Share Exchange Pspi Transaction | Phillips Specialty Products Inc
Assets Held For Sale Or Sold (Textual) [Abstract]
Cash included in carrying value reflected as financing cash outflow							450
Whitegate Refinery | Refining
Assets Held For Sale Or Sold (Textual) [Abstract]
Total carrying value of ownership interest sold	$ 135
Disposal group inventory, other working capital, and properties, plants and equipment	127
Allocated goodwill included in carrying value of disposed asset	$ 8
Malaysian Refining Company | Refining
Assets Held For Sale Or Sold (Textual) [Abstract]
Total carrying value of ownership interest sold		$ 334
Carrying amount at time of disposition including goodwill and currency translation adjustments		76					$ 76
Before-tax gain recognized on disposition		$ 145

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