Operating Segments - Segment Financial Data (Details) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($) segment	Jun. 30, 2015 USD ($)
Operating Segments
Operating segments number \| segment			3
Revenues:
Total revenues	$ 4,950	$ 6,663	$ 9,060	$ 12,605
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments
Equity earnings in unconsolidated entities	40	52	87	89
Segment profit/(loss)	390	371	833	884
Maintenance capital	35	52	81	102
Transportation
Revenues:
Total revenues	170	180	323	366
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments
Equity earnings in unconsolidated entities	40	52	87	89
Segment profit/(loss)	252	186	499	428
Maintenance capital	23	33	57	66
Facilities
Revenues:
Total revenues	132	137	270	261
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments
Segment profit/(loss)	156	144	315	285
Maintenance capital	9	17	18	32
Supply and Logistics
Revenues:
Total revenues	4,648	6,346	8,467	11,978
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments
Segment profit/(loss)	(18)	41	19	171
Interest expense related to hedged inventory purchases	3	2	6	3
Maintenance capital	3	2	6	4
Operating Segments
Revenues:
Total revenues	5,325	7,022	9,795	13,312
Operating Segments \| Transportation
Revenues:
Total revenues	403	402	787	803
Operating Segments \| Facilities
Revenues:
Total revenues	270	269	535	525
Operating Segments \| Supply and Logistics
Revenues:
Total revenues	4,652	6,351	8,473	11,984
Intersegment
Revenues:
Total revenues	(375)	(359)	(735)	(707)
Intersegment \| Transportation
Revenues:
Total revenues	(233)	(222)	(464)	(437)
Intersegment \| Facilities
Revenues:
Total revenues	(138)	(132)	(265)	(264)
Intersegment \| Supply and Logistics
Revenues:
Total revenues	$ (4)	$ (5)	$ (6)	$ (6)

The interest expense incurred related to hedged inventory purchases, which is included in segment profit.

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Capital expenditures for the replacement of partially or fully depreciated assets in order to maintain the operating and/or earnings capacity of the company's existing assets.

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Revenues and equity earnings in unconsolidated entities less (a) purchases and related costs, (b) field operating costs and (c) segment general and administrative expenses. Excludes depreciation and amortization.

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This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(12))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 225
-Section S99
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 323
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-Section 45
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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